Calculator Guides & How-To Articles

Mortgages, debt, student loans and saving. Each guide explains the formula in words, works an example and points to the matching calculator.

UK property tax3 min read

Stamp Duty by Property Price: £100,000 to £2 MillionStamp duty (SDLT) at every price from £100,000 to £2 million: main home, first-time buyer, second home and non-UK resident, England and NI, 2026.Read the guidearrow_forward

UK property tax3 min read

Stamp Duty on £1 million: What You Pay in 2026Stamp duty on a £1 million property in England & NI: £43,750 as a main home, no first-time buyer relief at this price, £93,750 as a second home, with the...Read the guidearrow_forward

UK property tax3 min read

Stamp Duty on £750,000: What You Pay in 2026Stamp duty on a £750,000 property in England & NI: £27,500 as a main home, no first-time buyer relief at this price, £65,000 as a second home, with the...Read the guidearrow_forward

UK property tax3 min read

Stamp Duty on £550,000: What You Pay in 2026Stamp duty on a £550,000 property in England & NI: £17,500 as a main home, no first-time buyer relief at this price, £45,000 as a second home, with the...Read the guidearrow_forward

UK property tax3 min read

Stamp Duty on £500,000: What You Pay in 2026Stamp duty on a £500,000 property in England & NI: £15,000 as a main home, £10,000 for first-time buyers, £40,000 as a second home, with the band-by-band...Read the guidearrow_forward

UK property tax3 min read

Stamp Duty on £430,000: What You Pay in 2026Stamp duty on a £430,000 property in England & NI: £11,500 as a main home, £6,500 for first-time buyers, £33,000 as a second home, with the band-by-band...Read the guidearrow_forward

UK property tax3 min read

Stamp Duty on £180,000: What You Pay in 2026Stamp duty on a £180,000 property in England & NI: £1,100 as a main home, £0 for first-time buyers, £10,100 as a second home, with the band-by-band working.Read the guidearrow_forward

UK property tax3 min read

Stamp Duty on £150,000: What You Pay in 2026Stamp duty on a £150,000 property in England & NI: £500 as a main home, £0 for first-time buyers, £8,000 as a second home, with the band-by-band working.Read the guidearrow_forward

How-to4 min read

Balance Transfer vs Paying Down a Credit Card: Fee vs InterestMoving $5,000 off a 24.99% card for 18 months costs a $150 to $250 fee against about $1,047 of interest if you keep paying it down. See when a transfer wins.Read the guidearrow_forward

How-to4 min read

Credit Card Payoff Chart: Monthly Payment Needed by Balance and TimelineTo clear $5,000 at 24.99% APR in 24 months you need about $266.83 a month. See the payment for balances from $2,500 to $20,000 over 12 to 60 months.Read the guidearrow_forward

How-to4 min read

How Credit Card Interest Is Calculated: Daily Periodic Rate ExampleCard interest uses APR ÷ 365 on your daily balance. At 24.99% that is about 0.0685% a day, or $102.70 over 30 days on $5,000. See the formula and a monthly interest...Read the guidearrow_forward

How-to4 min read

Credit Card Minimum Payment: Formulas and How Long Payoff TakesOn $5,000 at 24.99% APR, a 1% plus interest minimum takes 236 months and costs about $9,278 in interest. Compare three minimum formulas with fixed payments.Read the guidearrow_forward

How-to4 min read

Long Commute vs Higher Salary: Comparing Job OffersA $6,000 raise with a 30-mile commute instead of 10 miles leaves about $3,921 after fuel and wear, for 240 extra hours. See how to compare offers.Read the guidearrow_forward

How-to4 min read

Commute Time: Hours Per Year and What It Costs YouA 45-minute one-way commute is 360 hours a year, or 9 forty-hour work weeks. See hours by commute length and what that time is worth at $20 to $45 an hour.Read the guidearrow_forward

How-to4 min read

Cost Per Mile to Drive: AAA vs IRS vs Fuel OnlyAAA puts the average new vehicle at about 86 cents a mile in 2026, the IRS rate is 76 cents, and fuel alone is about 12 cents. See which to use for your commute.Read the guidearrow_forward

How-to4 min read

How to Calculate Commute Cost: Formula and ExamplesAn 18.5-mile each-way commute at 28.5 MPG and $3.55 gas costs about $160.26 a month in fuel and wear. See the formula and yearly cost by distance.Read the guidearrow_forward

How-to4 min read

Sales Commission Structures: Flat, Tiered, Quota and Base Plus CommissionA $150,000 month at 5% to a $100,000 quota and 8% above pays $9,000. Compare flat, tiered, quota and base-plus-commission plans with examples.Read the guidearrow_forward

How-to4 min read

PayPal Fee Calculator: What You Pay and What to ChargePayPal lists 3.49% + $0.49 for US checkout payments, so a $100 sale costs $3.98. To receive $100 you would charge about $104.12.Read the guidearrow_forward

How-to4 min read

eBay Fees Calculator: Final Value Fee ExamplesFor most US categories eBay charges 13.6% up to $7,500 plus $0.40 per order, so a $100 sale costs $14.00. See examples for $8 to $10,000.Read the guidearrow_forward

How-to4 min read

Real Estate Commission: Splits and Take-Home PayA $400,000 sale at 3% earns $12,000 in commission, or $8,400 on a 70/30 split. See commission by price, rate and split, with a per-deal fee example.Read the guidearrow_forward

How-to4 min read

Car Lease Fees and End-of-Lease Charges ExplainedThe default lease has $1,290 of fees: $895 at signing and $395 at return. Learn the common lease fees and how they add to the $24,978 total.Read the guidearrow_forward

How-to4 min read

Lease vs Buy a Car: Total Cost ComparisonOn a $44,500 car over 36 months, leasing costs about $24,978 in cash and buying nets out near $23,445. See the full comparison and assumptions.Read the guidearrow_forward

How-to4 min read

Money Factor to APR Conversion ChartMultiply a money factor by 2,400 to get the APR. A 0.00225 money factor equals 5.4%. See a chart from 0.001 to 0.003 with the effect on a lease payment.Read the guidearrow_forward

How-to4 min read

How to Calculate a Car Lease Payment, Step by StepA $44,500 car with a 56% residual, 36 months and a 0.00225 money factor costs $544.95 a month before tax. Learn the formula and what moves the payment.Read the guidearrow_forward

How-to4 min read

New vs Used Car Depreciation: Which Costs Less Per Year?A $38,500 new car loses about $11,665 (30%) in its first two years and $7,272 over the next three. See why a 2-year-old car costs less per year.Read the guidearrow_forward

How-to4 min read

Negative Equity on a Car Loan: When You Owe More Than It's WorthWith no down payment on an 84-month loan, a $38,500 car can leave you $2,403 underwater after one year. See how down payment and term change it.Read the guidearrow_forward

How-to4 min read

How Long Until a Car Loses Half Its Value?At 15% a year a car loses half its value in about 4.3 years. At 20% it takes 3.1 years and at 10% it takes 6.6 years. See the table and the formula.Read the guidearrow_forward

How-to4 min read

Car Depreciation Formula: Declining Balance vs Straight-LineAt 15% a year, a $30,000 car is worth $13,311 after 5 years by declining balance and $7,500 by straight-line. Learn both formulas and when to use each.Read the guidearrow_forward

How-to4 min read

48 vs 60 vs 72-Month Car Loan: What You Can AffordOn a $24,000 loan at 6.5%, 72 months costs $5,048 in interest against $3,320 at 48 months. Compare payment, interest and buying power by term.Read the guidearrow_forward

How-to4 min read

How Much Down Payment for a Car?A 20% down payment on a $30,000 car is $6,000. Compare 0%, 10%, 20% and 30% down on payment, interest and the balance after one year.Read the guidearrow_forward

How-to4 min read

The 20/4/10 Rule for Buying a Car, With ExamplesThe 20/4/10 rule means 20% down, a loan of 4 years or less and total car costs under 10% of income. A $30,000 car needs about $8,700 a month of income.Read the guidearrow_forward

How-to4 min read

How Much Car Can I Afford Based on Income?With $5,000 a month take-home, a 10% car budget leaves a $200 loan payment, or about $8,433 of loan over 48 months at 6.5%. See the numbers by income.Read the guidearrow_forward

How-to4 min read

CD Ladder Plus HYSA: How to Split Your SavingsKeep an emergency fund in a HYSA and the rest in a five-rung CD ladder. With example rates, $50,000 split this way earns $2,040 in year one, a 4.08% blended yield.Read the guidearrow_forward

Explained4 min read

Savings Account Types Compared: HYSA, CD, Money MarketCompare high-yield savings, CDs, money market accounts and traditional savings on rate type, access, penalties, insurance and best use.Read the guidearrow_forward

How-to4 min read

Should You Break a CD Early for a Higher HYSA Rate?Break a $10,000 4.50% CD after 6 months with a 90-day penalty and move to a 5.00% HYSA, and you end $40.92 behind. The HYSA would need about 5.26% to break even.Read the guidearrow_forward

Explained4 min read

How Falling Rates Change CD vs HYSA EarningsOn $10,000 for 24 months, a 4.50% CD earns $920.25. A HYSA starting at 4.00% earns $816.00 if the rate holds, $716.48 if it falls 0.5 point a year and $617.25 if it...Read the guidearrow_forward

Explained4 min read

Are CDs Taxable? CD Interest Tax and After-Tax ReturnCD interest is taxed as ordinary income. On $450 of interest, a 24% federal bracket takes $108, leaving $342 and an after-tax yield of 3.42%.Read the guidearrow_forward

How-to4 min read

CD Early Withdrawal Penalty: How It Works and How to Calculate ItMost CD penalties are a set number of days of interest. On $10,000 at 4.50%, 90 days costs about $110.96 and 180 days about $221.92.Read the guidearrow_forward

Explained4 min read

CD APY vs Interest Rate and Compounding FrequencyA 5.00% CD rate compounded daily is a 5.1267% APY and earns $10,512.67 on $10,000 in a year, against $10,500.00 with annual compounding.Read the guidearrow_forward

How-to4 min read

How to Calculate CD Interest: Formula and ExamplesCD maturity value = deposit × (1 + APY)^years. A $10,000 CD at 4.50% APY earns $450 in 12 months, $920.25 in 24 months and $2,461.82 in 60 months.Read the guidearrow_forward

How-to4 min read

How to Calculate Your Savings Rate and Emergency Fund TargetSavings rate = amount saved ÷ take-home income. Saving $400 from $5,200 is 7.7%; the 50/30/20 target of $1,040 is 20%. An emergency fund of 3 to 6 months of needs is...Read the guidearrow_forward

How-to4 min read

Weekly and Bi-Weekly Paycheck to Monthly Budget: ConversionMonthly income = weekly pay × 52 ÷ 12 or bi-weekly pay × 26 ÷ 12. A $1,000 weekly paycheck is $4,333.33 a month, not $4,000, and a 50/30/20 budget on it is $2,166.67,...Read the guidearrow_forward

Comparison4 min read

Needs vs Wants vs Savings: What Counts in a BudgetNeeds are essentials such as rent, groceries and minimum debt payments; wants are discretionary such as dining out and subscriptions; extra debt payments, emergency...Read the guidearrow_forward

How-to4 min read

How to Use the 50/30/20 Budget Rule: Examples and VariationsThe 50/30/20 rule splits take-home pay into 50% needs, 30% wants and 20% savings and extra debt payoff. On $5,200 a month that is $2,600, $1,560 and $1,040....Read the guidearrow_forward

Comparison4 min read

Margin vs Markup: Difference, Formulas and Conversion ChartMargin is profit ÷ price; markup is profit ÷ cost. A 40% margin needs a 66.7% markup, while a 40% markup gives only a 28.6% margin. Cost $100 sold at $150 is a 33.3%...Read the guidearrow_forward

Explainer4 min read

Contribution Margin: Formula, Ratio and ExamplesContribution margin = price − variable cost. At $65 and $24.50 it is $40.50 a unit, a 62.31% ratio. Break-even revenue is fixed costs ÷ ratio: $12,500 ÷ 0.6231 = $20,062.Read the guidearrow_forward

How-to4 min read

Break-Even ROAS and ACoS: Formula, Table and ExamplesBreak-even ROAS = price ÷ (price − variable costs) = 1 ÷ contribution margin. A 40% margin needs ROAS 2.50 to break even; for a 10% profit it needs 3.33. Break-even...Read the guidearrow_forward

How-to4 min read

How to Calculate the Break-Even Point: Formula and ExamplesBreak-even units = fixed costs ÷ (price − variable cost). With $12,500 fixed costs, a $65 price and $24.50 variable cost, you need 309 units ($20,085 revenue); a...Read the guidearrow_forward

Explainer4 min read

Savings Bond Price Calculator: How EE and I Bond Values WorkSavings bonds are valued by rules, not market yield. EE bonds issued May–Oct 2026 earn 2.40% and double in 20 years; I bonds earn 4.26% (0.90% fixed + 1.67%...Read the guidearrow_forward

How-to4 min read

Zero-Coupon Bond Price: Formula and ExampleA zero-coupon bond price = face value ÷ (1 + y/m)^n. A $1,000 zero maturing in 10 years at a 4% yield with semi-annual compounding costs $672.97; with annual...Read the guidearrow_forward

Explainer4 min read

Bond Duration and Convexity Explained With ExamplesModified duration estimates the % price change for a 1-point yield move. A 5% 10-year bond at a 6% yield has Macaulay duration 7.89, modified 7.67; a 1-point rise is...Read the guidearrow_forward

Comparison4 min read

Bond Premium vs Discount vs Par: How Price and Yield RelateIf market yield is above the coupon rate a bond trades at a discount; below it, at a premium; equal, at par. A 5% 10-year bond costs $1,081.76 at a 4% yield, $1,000...Read the guidearrow_forward

How-to4 min read

How to Calculate a Bond Price: Formula and Worked ExampleBond price = PV of coupons + PV of face value. A $1,000 bond with a 5% coupon, 10 years and semi-annual payments at a 6% yield is worth $925.61: $371.94 for the...Read the guidearrow_forward

Planning4 min read

How Fast Can Net Worth Grow? 10 and 20 Year ProjectionFrom $194,000 at 7%, adding $1,000 a month reaches $562,959 in 10 years and $1,304,442 in 20. See what saving does compared with growth alone.Read the guidearrow_forward

Basics4 min read

What Counts in Net Worth? Assets and Liabilities ChecklistA practical checklist of what to include when you calculate net worth: home equity, vehicles, retirement accounts, debts, and how to treat pre-tax balances.Read the guidearrow_forward

Benchmarks4 min read

The Millionaire Next Door Net Worth Formula: Age x Income / 10Expected net worth = age x pre-tax income / 10. See the table for ages 30-60, the 2x prodigious and 0.5x under-accumulator thresholds, and the limits.Read the guidearrow_forward

Benchmarks4 min read

Average and Median Net Worth by Age in the US (2022 Data)Federal Reserve 2022 data: median net worth is $39,000 under 35 and $409,900 at 65-74. See median vs mean by age and why the median is the better benchmark.Read the guidearrow_forward

Business4 min read

Amortization vs Loan Amortization: Business Start-Up Costs ExplainedThe accounting meaning of amortization: how U.S. business start-up costs can be partly deducted and the rest amortized, and how it differs from loan amortization.Read the guidearrow_forward

Mortgage4 min read

Biweekly Mortgage Payments: How Much Time and Interest Do You Save?How paying half your mortgage every two weeks pays a $320,000, 6.5% loan off in about 24 years and saves about $93,996, and how to do the same yourself.Read the guidearrow_forward

Mortgage4 min read

PMI Cost and How to Remove It: 80%, 78% and the Midpoint RuleWhat PMI costs at 5%, 10% and 15% down on a $400,000 home, and the three rules that end it: request at 80%, automatic at 78%, and the loan midpoint.Read the guidearrow_forward

Education savings4 min read

College Cost in 18 Years: Four-Year Projections at 3% and 5% InflationProject four years of college cost for a newborn at 3% and 5% yearly cost growth, by in-state, out-of-state, private and elite private, and what it means for monthly...Read the guidearrow_forward

Education savings4 min read

529 to Roth IRA Rollover: The Rules and a Worked TimelineHow the 529-to-Roth IRA rollover works: 15-year account rule, 5-year funds rule, $35,000 lifetime limit, annual Roth limit, and a year-by-year timeline.Read the guidearrow_forward

Education savings4 min read

529 Plan Rules for 2026: Qualified Expenses, Gift Limits and Withdrawals2026 529 plan rules: $20,000 K-12 tuition limit, credentialing expenses, $19,000 gift exclusion, $95,000 five-year election and non-qualified withdrawal tax.Read the guidearrow_forward

Borrowing4 min read

How to Pay Off a Loan Faster: What Extra Payments SaveSee how $50, $100 or $200 extra a month shortens a $20,000, 7.5%, 60-month loan and cuts interest, with a table and tips for applying extra payments to principal.Read the guidearrow_forward

Borrowing4 min read

Loan APR vs Interest Rate: What an Origination Fee Really CostsAPR vs interest rate on a loan, with a worked $20,000 example showing how 1%, 3%, 5% and 8% origination fees raise the effective APR, and how much to borrow to cover...Read the guidearrow_forward

Retirement4 min read

401(k) Rollover When You Change Jobs: Options and the 60-Day RuleYour options for an old 401(k): leave it, roll it to the new plan or an IRA. How direct rollovers avoid the 20% withholding and the 60-day rule.Read the guidearrow_forward

Retirement4 min read

401(k) Employer Match: How Much to Contribute to Get It AllHow a 401(k) match works, with a side-by-side table of three common formulas on a $70,000 salary and the contribution that earns the full match.Read the guidearrow_forward

Retirement4 min read

2026 401(k) Contribution Limits: Standard, Catch-Up and Super Catch-Up2026 401(k) limits: $24,500 employee deferral, $8,000 catch-up, $11,250 for ages 60-63, the $72,000 combined cap and the Roth catch-up rule for high earners.Read the guidearrow_forward

Real estate tax4 min read

Depreciation Recapture When You Sell a Rental Property: How It WorksHow depreciation recapture is taxed when you sell a rental property, with a worked $850,000 sale example, the 25% maximum rate and how a 1031 exchange defers it.Read the guidearrow_forward

Real estate tax4 min read

Qualified Intermediary for a 1031 Exchange: What It Does and How to ChooseWhat a qualified intermediary does in a 1031 exchange, who cannot serve as one, what can go wrong, and questions to ask before you hire.Read the guidearrow_forward

Investing4 min read

How Investment Fees Affect Your Returns Over 20 YearsSee how a 0.1%, 0.5%, 1% or 2% annual fee changes a $10,000 portfolio with $300 monthly contributions after 20 years, with a worked table.Read the guidearrow_forward

UK property tax4 min read

Stamp Duty on a Second Home or Buy-to-Let: The 5% Surcharge ExplainedBuying a second home or buy-to-let in England or Northern Ireland? See the 5% SDLT surcharge, the £40,000 rule, worked examples and how to claim it back.Read the guidearrow_forward

Investing4 min read

How to Calculate Investment Return: ROI vs CAGR With ExamplesCalculate investment return three ways: ROI, CAGR and real return after inflation, with worked examples and the effect of fees on a 20-year portfolio.Read the guidearrow_forward

Real estate tax4 min read

1031 Exchange 45-Day and 180-Day Rules: Deadlines Explained1031 exchange deadlines explained: the 45-day identification rule, the 180-day closing rule, the tax return cut-off, example dates and what happens if you miss them.Read the guidearrow_forward

UK property tax4 min read

When Do You Pay Stamp Duty? UK Deadline, Late Penalties and RefundsStamp duty (SDLT) is due within 14 days of completion. See who pays, late filing penalties, how to reclaim the higher rates and the first-time buyer rules.Read the guidearrow_forward

Guide2 min read

Savings Goal Calculator Compound Interest: Worked Example and ScenariosSavings Goal Calculator Compound Interest: a worked example with the formula shown step by step, a year-by-year or scenario table, and the assumptions behind it.Read the guidearrow_forward

Guide2 min read

Calculate Student Loan Payoff: Worked Example and ScenariosCalculate Student Loan Payoff: a worked example with the formula shown step by step, a year-by-year or scenario table, and the assumptions behind it.Read the guidearrow_forward

Guide2 min read

Percent Off Calculator %: Worked Example and ScenariosPercent Off Calculator %: a worked example with the formula shown step by step, a year-by-year or scenario table, and the assumptions behind it.Read the guidearrow_forward

Guide2 min read

Auto Loan Calculator Amortization Schedule: Worked Example and ScenariosAuto Loan Calculator Amortization Schedule: a worked example with the formula shown step by step, a year-by-year or scenario table, and the assumptions behind it.Read the guidearrow_forward

Guide2 min read

Annuity Calculator Free Online: Worked Example and ScenariosAnnuity Calculator Free Online: a worked example with the formula shown step by step, a year-by-year or scenario table, and the assumptions behind it.Read the guidearrow_forward

Renting5 min read

How Much Rent Can I Afford? 30% Rule by SalarySpend no more than about 30% of gross income on rent: $1,500 a month on a $60,000 salary. See rent by salary, the 40x landlord rule and hidden costs.Read the guidearrow_forward

Retirement6 min read

How Much Do I Need to Retire? The 25x Rule ExplainedSave 25 times your annual spending: $72,000 a year needs about $1,800,000 at a 4% withdrawal rate. See the table, where the rule comes from and its limits.Read the guidearrow_forward

Home buying6 min read

How Much House Can I Afford on a $75,000 Salary?The 28/36 rule suggests about $272,000 on a $75,000 salary with 20% down and no other debts. See the table by salary and a worked example.Read the guidearrow_forward

Savings goals5 min read

How Long Does It Take to Save $10,000? Monthly Plan ChartSaving $500 a month reaches $10,000 in 20 months. See how long it takes at other monthly deposits, and the deposit needed for any deadline.Read the guidearrow_forward

Down payment6 min read

How Much Down Payment Do You Need for a $400,000 House?20% down on a $400,000 house is $80,000; 3% is $12,000. See the loan, PMI and monthly payment at 3%, 5%, 10% and 20% down.Read the guidearrow_forward

Emergency fund5 min read

How Many Months of Expenses Should an Emergency Fund Cover?Most guidance suggests 3-6 months of essential expenses: $10,500-$21,000 on $3,500 a month. See targets by situation and a worked example.Read the guidearrow_forward

Refinancing6 min read

How Long Does It Take to Break Even on a Refinance?Divide closing costs by monthly savings: $6,000 of costs and $197 saved a month breaks even in about 30 months. Table by closing costs and rate drop.Read the guidearrow_forward

Credit card payoff6 min read

How Long to Pay Off $5,000 Credit Card Debt? Payment Chart$5,000 at 22% APR takes 34 months at $200 a month and costs about $1,750 in interest. See payoff times for $100 to $500 payments.Read the guidearrow_forward

Savings6 min read

CD vs High-Yield Savings Account: Which Earns More?A locked 4.50% CD earns $450.00 on $10,000 in a year; a savings account earns more only if its rate stays at or above the CD's. See the comparison and break-even rule.Read the guidearrow_forward

Formula breakdown5 min read

Monthly Mortgage Formula Explained SimplyLearn the monthly mortgage formula M = P[r(1+r)^n]/[(1+r)^n-1]. Worked $300,000 example, Excel PMT, taxes, PMI, and amortization.Read the guidearrow_forward

Amortization6 min read

How to Calculate a Mortgage Payment Step by StepLearn how to calculate a mortgage payment step by step: the formula, a worked $240,000 example, an amortization schedule, and how rate, term and down payment change...Read the guidearrow_forward

Mortgages6 min read

Mortgage Calculator Guide: Estimate Payments, Interest & AffordabilityLearn how to use a mortgage calculator to estimate monthly payments, total interest, loan affordability, down payments, taxes, insurance, and the effect of extra...Read the guidearrow_forward

Mortgages11 min read

VA Home Loan Calculator Guide: Funding Fee, Taxes & Monthly PaymentLearn how to calculate a VA home loan payment, including the VA funding fee, taxes, and insurance. See sample payments by home price and how down payment changes the fee.Read the guidearrow_forward

Debt strategy3 min read

Debt Avalanche vs. Snowball: Real Numbers on $14,700 in DebtAvalanche vs snowball with an actual worked example: three real debts, exact months, exact interest saved. Plus the 0% balance transfer breakeven math.Read the guidearrow_forward

Mortgages & investing5 min read

Extra Mortgage Payments vs. Investing: The Real Math (2026)Should you pay extra on your mortgage or invest the difference? Worked numbers on a $400,000 loan, biweekly payment savings, PMI removal timing, and points breakeven...Read the guidearrow_forward

Debt strategy8 min read

Debt Payoff Calculator Guide: How Payment Changes Your Debt-Free DateLearn how payment size, interest rate, and balance change your debt-free date. Use the CalculatePilot Debt Payoff Calculator to compare realistic payoff strategies...Read the guidearrow_forward

Debt2 min read

What Is a Good Debt-to-Income Ratio?A good DTI ratio is below 36%. Learn what debt-to-income ratio means, how to calculate front-end and back-end DTI, and what lenders actually look for.Read the guidearrow_forward

Student loans2 min read

How to Calculate Student Loan Payments (2026 Guide)Student loan payment formula explained. A $30,000 loan at 6.5% over 10 years = $340/month. Full breakdown by loan amount, rate, and term with payment tables.Read the guidearrow_forward

US policy 20264 min read

SAVE Plan Borrowers Face a Deadline This Month — What It Means for Your PaymentA SAVE repayment plan deadline this month could raise monthly payments for federal student loan borrowers who don't switch plans in time. Here's what's happening and...Read the guidearrow_forward

Car loans8 min read

Car Loan Refinance Calculator Guide: Check If Refinancing Saves MoneyLearn how to use a car loan refinance calculator: gather your payoff balance and rate, compare a new offer, and read monthly savings versus total interest before you...Read the guidearrow_forward

Saving7 min read

Emergency Fund Calculator Guide: Build a Cash Reserve That Fits Your Real LifeUse an emergency fund calculator to set a practical savings target based on essential expenses, income stability, dependents, and unexpected costs.Read the guidearrow_forward

Education planning5 min read

529 Calculator by Age: How Much Should You Save for College?Use a 529 calculator by age to estimate college savings growth, monthly contributions, future college costs, and funding gaps. Includes examples for different ages.Read the guidearrow_forward

Education planning2 min read

529 College Savings Calculator: Growth, Contributions & ExamplesLearn how a 529 college savings calculator estimates future value, monthly contributions, growth and college funding targets with practical examples.Read the guidearrow_forward

Investing2 min read

How to Calculate Compound InterestCompound interest formula explained: A = P(1 + r/n)^(nt). Learn how to calculate compound interest with worked examples for savings, investments, and loans.Read the guidearrow_forward

Everyday money2 min read

Discount Calculator Guide: Calculate Sale Price & SavingsLearn how to calculate discounts, sale prices, and savings with simple percentage formulas and examples. Includes discount plus tax and reverse discount examples.Read the guidearrow_forward

Open these when a calculator gives you a number you still need to interpret, such as scientific notation, a triangle solution, a slope or a time zone.

How-to4 min read

Rectangular vs Polar Form of Complex Numbers: Which to UseUse rectangular form to add and subtract complex numbers and polar form to multiply, divide, raise to powers and take roots. See (3+4i)(1−2i) done both ways.Read the guidearrow_forward

How-to4 min read

Square Root and nth Roots of Complex Numbers With De MoivreThe square roots of 3 + 4i are ±(2 + i). Learn how De Moivre's theorem gives all nth roots, with cube roots of 1 and 4th roots of 1 worked out.Read the guidearrow_forward

How-to4 min read

Complex Number Polar Form: Modulus and Argument With Examples3 + 4i has modulus 5 and argument 53.13°, so its polar form is 5∠53.13°. See the formulas, a conversion table and why atan2 beats arctan.Read the guidearrow_forward

How-to4 min read

Complex Number Calculator: Add, Subtract, Multiply and Divide With Examples(3+4i) + (1−2i) = 4 + 2i, (3+4i)(1−2i) = 11 − 2i and (3+4i) ÷ (1−2i) = −1 + 2i. Step-by-step rules and worked examples for all four operations.Read the guidearrow_forward

How-to4 min read

Equation of a Circle in Standard Form, With ExamplesThe equation of a circle is (x − h)² + (y − k)² = r². A circle of radius 5 at the origin is x² + y² = 25. See worked examples.Read the guidearrow_forward

How-to4 min read

Circumference of a Circle From Diameter and RadiusCircumference = πd = 2πr. A diameter of 10 gives 31.42. To find the diameter from the circumference, divide by π. Formulas and examples.Read the guidearrow_forward

How-to4 min read

How to Find the Square Footage of a CircleA circle with a 10 ft diameter covers 78.54 sq ft. Learn how to convert inches and metres and find the square feet of a round area.Read the guidearrow_forward

How-to4 min read

Area of a Circle Formula, With ExamplesThe area of a circle is πr². A circle with radius 5 has an area of 78.54. Learn the formula from radius, diameter and circumference.Read the guidearrow_forward

How-to4 min read

Binomial Experiment: Four Conditions, With Examples and Non-ExamplesA binomial experiment needs a fixed number of trials, two outcomes, constant probability and independence. Test your situation with coin, dice, card and survey examples.Read the guidearrow_forward

Comparison4 min read

binompdf vs binomcdf: TI-84, Excel, R and Python Syntaxbinompdf(n, p, k) gives P(X = k) and binomcdf(n, p, k) gives P(X ≤ k). Excel uses BINOM.DIST(k, n, p, FALSE or TRUE). For n = 10, p = 0.5, k = 3: 0.117188 and 0.171875.Read the guidearrow_forward

Reference4 min read

Binomial Distribution Mean, Variance and Standard Deviation (With Examples)For X ~ Binomial(n, p): mean = np, variance = np(1 − p), standard deviation = √(np(1 − p)). Example: n = 100, p = 0.5 gives 50, 25 and 5.Read the guidearrow_forward

How-to4 min read

How to Calculate Binomial Probability: Formula and Worked ExamplesP(X = k) = C(n, k) · p^k · (1 − p)^(n−k). Worked examples: 3 sixes in 12 rolls = 0.197396, 6 heads in 10 flips = 0.205078. Includes at-least and at-most cases.Read the guidearrow_forward

Reference4 min read

Binary to Decimal to Hex Conversion Chart (0–15) With ExamplesConvert binary to decimal by adding the place values of the 1 bits, and group bits in fours for hex. 101101 = 45 = 2D, and 11111111 = 255 = FF. Includes a 0–15 chart.Read the guidearrow_forward

How-to4 min read

Two's Complement Explained: Negative Binary Numbers With ExamplesTwo's complement writes negative numbers by flipping every bit and adding 1. -5 is 11111011 in 8 bits. See ranges, subtraction by addition and how to read a negative...Read the guidearrow_forward

How-to4 min read

Binary Addition, Subtraction, Multiplication and Division: Worked ExamplesAdd, subtract, multiply and divide binary numbers by hand with carries and borrows. Examples: 1011 + 0110 = 10001, 1011 × 1101 = 10001111, 1101 ÷ 0100 = 11 remainder 1.Read the guidearrow_forward

How-to4 min read

How to Use a Binary Calculator: Arithmetic, Bitwise Logic and Word SizeA binary calculator adds, subtracts, multiplies and divides base-2 numbers inside a fixed word size. Learn inputs, overflow, bitwise gates, shifts and how to read the...Read the guidearrow_forward

How-to4 min read

Calculator Memory Keys: M+, M−, MR and MC ExplainedM+ adds the screen to memory, M− subtracts it, MR recalls it and MC clears it. Worked example: 12.5 M+ then 7.5 M+ then MR shows 20.Read the guidearrow_forward

Comparison4 min read

Calculator Order of Operations: Left to Right vs PEMDASA basic calculator works left to right, so 2 + 3 × 4 gives 20. PEMDAS gives 14. See five examples, why they differ and how to force the right order.Read the guidearrow_forward

How-to4 min read

How to Use the % Key on a Calculator: Tax, Discounts and TipsOn this calculator the % key divides by 100. So 80 × 15 % = gives 12, 851 × 106 % = adds 6% tax (902.06) and 200 × 85 % = takes 15% off (170).Read the guidearrow_forward

How-to4 min read

How to Use a Basic Calculator: Keys, Memory and Common MistakesA basic calculator works left to right: type a number, an operator, another number, then =. Learn C vs AC, the % key, square root, memory keys and the mistakes to avoid.Read the guidearrow_forward

How-to4 min read

Image to Base64 Data URIs: How Much Bigger Does It Get?Embedding an image as a Base64 data URI makes it about 33% bigger: a 10 KB image becomes 13,656 characters. When data URIs are worth it and when they are not.Read the guidearrow_forward

Comparison4 min read

Base64url vs Standard Base64: Differences and Why JWTs Use ItBase64url swaps + and / for - and _ and usually drops = padding. Example: bytes FB FF FE are -__- in Base64url and +//+ in standard Base64.Read the guidearrow_forward

How-to4 min read

Base64 Decode Errors and Padding: Why It Fails and How to Fix ItBase64 decoding fails on invalid characters, wrong length, missing = padding or URL-safe vs standard mix-ups. Fix by cleaning input, padding to a multiple of 4 and...Read the guidearrow_forward

How-to4 min read

How Base64 Encoding Works (Step by Step, With Examples)Base64 turns every 3 bytes into 4 characters from a 64-character alphabet. 'Man' becomes TWFu, 'Ma' becomes TWE= and the output grows by about 33%.Read the guidearrow_forward

Comparison4 min read

Area vs Perimeter: What's the Difference? (With Examples)Area measures the surface inside a shape; perimeter measures the distance around it. Shapes with a 12 m perimeter can have areas of 5, 8, 9 or 11.46 m2.Read the guidearrow_forward

Reference4 min read

Area of a Rhombus, Kite and Semicircle (Formulas and Examples)Rhombus and kite area = half the product of the diagonals; semicircle area = half of pi r squared. Worked examples: 24, 30 and 39.27.Read the guidearrow_forward

Conversion4 min read

Square Feet to Square Meters Conversion (and Back)1 square metre = 10.7639 square feet and 1 square foot = 0.0929 square metres. See the exact factors, a quick chart and acre and hectare conversions.Read the guidearrow_forward

How-to4 min read

How to Calculate the Area of an L-Shaped or Irregular RoomSplit the shape into rectangles, find each area and add them, or subtract the missing part. A 6 m x 4 m room with a 2 m x 2 m corner missing is 20 m2.Read the guidearrow_forward

Borrowing4 min read

How Much of Your Loan Is Paid Off After 5, 10 and 15 Years?On a $300,000, 6.5%, 30-year loan only 6.4% is repaid after 5 years. See the balance and principal paid at 5, 10, 15, 20 and 25 years and why.Read the guidearrow_forward

Borrowing4 min read

How Loan Amortization Works: Why Early Payments Are Mostly InterestHow an amortizing loan splits each payment into interest and principal, with the monthly payment formula and a worked $20,000, 7.5%, 60-month example.Read the guidearrow_forward

Percentages5 min read

Percentage Calculator: Percent, IncreaseLearn how to calculate percentages, percentage increase and decrease, and find what percent one number is of another with worked examples.Read the guidearrow_forward

Math baseline2 min read

How to Calculate Percentages — Complete Guide with ExamplesHow to calculate percentages: find X% of a number, percentage increase/decrease, and what percentage one number is of another. Formula and worked examples.Read the guidearrow_forward

Text and numbers2 min read

Number to Words Converter: How to Spell Numbers in WordsLearn how to convert numbers to words for checks, forms, invoices, and documents. See examples, rules, and common mistakes with a free number to words converter.Read the guidearrow_forward

Powers of ten2 min read

Scientific Notation Calculator GuideLearn how to convert decimals to scientific notation and back. Understand coefficients, positive and negative exponents, formulas, and worked examples.Read the guidearrow_forward

Geometry3 min read

How to Find Angles of a Triangle from Side LengthsHow to find the angles of a triangle from side lengths using the Law of Cosines. Includes base angles, area formulas, triangle inequality, and a worked 5-6-7 example.Read the guidearrow_forward

Coordinate plane2 min read

Slope Calculator Guide: Formula & Slope Between Two PointsLearn how to calculate slope between two points using the slope formula. Covers positive, negative, zero, and undefined slopes with examples.Read the guidearrow_forward

Solids2 min read

Volume Calculator Guide: Formulas for Common ShapesLearn volume formulas for cubes, rectangular boxes, cylinders, spheres, cones, and other shapes with simple worked examples.Read the guidearrow_forward

Trigonometry2 min read

Cos Inverse -1 = 180°Find cos inverse of -1 instantly: arccos(-1) = 180° = π radians. Learn why, see the unit-circle explanation, degree/radian forms, and use the trigonometry calculator.Read the guidearrow_forward

Conversion2 min read

Height Calculator Guide: Feet, Inches & CM ConversionLearn how to convert height between feet, inches, centimeters, and meters with simple formulas, examples, and a height conversion table.Read the guidearrow_forward

Time zones2 min read

UTC Time Converter Guide: Convert UTC to Local TimeLearn how UTC works, how to convert UTC to local time, calculate UTC offsets, and understand the difference between UTC and GMT.Read the guidearrow_forward

BMI is a screening tool, not a diagnosis. The car and moving-cost guides explain how the estimate is worked out.

How-to4 min read

Concrete Bags vs Ready-Mix: When to Order a TruckOne cubic yard is 45 bags of 80 lb mix, about 3,600 lb to mix by hand. Compare bags and ready-mix by volume, effort and consistency to decide when to order a truck.Read the guidearrow_forward

How-to4 min read

Concrete Volume Formulas for Slabs, Footings, Columns and StepsSlab: L × W × T ÷ 27. Round column: π × (d ÷ 24)² × h. Steps: width × run × rise × n(n+1) ÷ 2. Formulas with examples, plus ft³, yd³ and m³ conversions.Read the guidearrow_forward

How-to4 min read

Concrete Slab Calculator: Cubic Yards for Common Slab SizesA 12 × 12 ft slab at 4 in needs 1.78 yd³, or 1.96 yd³ with 10% waste. See cubic yards for six slab sizes at 4, 5 and 6 inches, and the area one yard covers.Read the guidearrow_forward

How-to4 min read

How Many Bags of Concrete in a Cubic Yard? 80, 60 and 50 lb BagsA cubic yard needs about 45 bags of 80 lb concrete, 60 bags of 60 lb or 72 bags of 50 lb. See bags for 0.5 to 10 yd³, plus post holes and footings.Read the guidearrow_forward

How-to4 min read

Should You Eat Back Exercise Calories?Eating back all your exercise calories can erase a deficit. See two methods, a worked example with a 391-calorie run, and how to avoid counting twice.Read the guidearrow_forward

How-to4 min read

MET Values Chart for Common ActivitiesMET values for 22 common activities, from yoga at 2.3 to fast swimming at 9.8, with intensity bands and calories burned in 30 minutes.Read the guidearrow_forward

How-to4 min read

Calories Burned Running vs Walking Per MileA 75 kg person burns about 122 calories per mile running at 6 mph and about 100 walking at 3 mph. See per-mile and per-minute numbers by weight.Read the guidearrow_forward

How-to4 min read

Calories Burned Walking: Per Mile, Per Hour and 10,000 StepsA 75 kg person walking at 3 mph burns about 100 calories a mile and about 299 an hour. See the numbers by weight and pace, and what 10,000 steps burn.Read the guidearrow_forward

How-to4 min read

Net Calories Explained: Food Minus ExerciseNet calories are calories eaten minus calories burned in exercise. Eating 2,000 and burning 350 gives a net of 1,650. See how net differs from a deficit.Read the guidearrow_forward

How-to4 min read

Activity Level Multipliers: Which One to Choose for Calorie NeedsThe five activity multipliers run from 1.2 to 1.9 and can change your calorie estimate by over 1,200 calories. See how to choose the right one.Read the guidearrow_forward

How-to4 min read

Calorie Surplus for Weight Gain: How Many Calories to AddAdding 250 to 500 calories above maintenance is a common range for gradual weight gain. Learn how to work out your surplus and daily target.Read the guidearrow_forward

How-to4 min read

Calorie Deficit Calculator: How to Work Out Your DeficitA 500-calorie daily deficit is about 0.45 kg (1 lb) of weight loss a week. Learn how to calculate your calorie deficit and daily target with examples.Read the guidearrow_forward

Comparison4 min read

Body Frame Size vs Body Type: Ectomorph, Mesomorph and EndomorphFrame size (small, medium, large) describes skeletal build from wrist and height. Ectomorph, mesomorph and endomorph are informal physique labels, and body shape...Read the guidearrow_forward

Explainer4 min read

Body Frame Size and Ideal Weight: The Hamwi Formula ExplainedHamwi: men 106 lb for 5 ft plus 6 lb per inch, women 100 lb plus 5 lb per inch, then ±10% for small or large frame. A man 5′10″ is 166 lb medium, 149.4 lb small,...Read the guidearrow_forward

Reference4 min read

Wrist Size Chart for Small, Medium and Large Frame (Men and Women)The MedlinePlus wrist chart in inches and cm: women 5′2″–5′5″ are small under 6″ (15.24 cm), medium 6–6.25″ and large over 6.25″ (15.88 cm); men over 5′5″ are medium...Read the guidearrow_forward

How-to4 min read

How to Measure Your Wrist and Find Your Body Frame SizeMeasure your wrist at the narrowest point just below the wrist bone, divide your height by it, and compare with the cut-offs: men small above 10.4, large below 9.6;...Read the guidearrow_forward

How-to4 min read

Fat Mass, Lean Mass and Target Weight From Body Fat PercentageFat mass = weight × body fat %. Lean mass = weight − fat mass. An 80 kg person at 25% has 20 kg fat and 60 kg lean; at 20% with the same lean mass they would weigh 75 kg.Read the guidearrow_forward

Comparison4 min read

Body Fat Percentage vs BMI: Which Is Better?BMI uses height and weight only, so it cannot tell muscle from fat. Body fat percentage can, but it has its own error. A man aged 30, 178 cm, 80 kg has a BMI of 25.2...Read the guidearrow_forward

Reference4 min read

Jackson-Pollock 3-Site Skinfold Body Fat Formula ExplainedThe Jackson-Pollock 3-site method turns three skinfold readings and age into body density, then body fat with the Siri equation. Example: a man aged 30 with 60 mm...Read the guidearrow_forward

How-to4 min read

How to Calculate Body Fat Percentage With the U.S. Navy MethodThe Navy method estimates body fat from neck, waist, hip and height. Example: waist 90 cm, neck 38 cm, height 178 cm gives 20.1% for a man. Formulas and steps included.Read the guidearrow_forward

How-to4 min read

How to Measure Blood Pressure at Home Accurately (Step by Step)For an accurate home reading rest 5 minutes, sit with your back supported and feet flat, keep your arm at heart level, avoid caffeine for 30 minutes and take two or...Read the guidearrow_forward

Safety4 min read

Hypertensive Crisis: Blood Pressure Above 180/120 and What to DoA reading higher than 180 systolic and/or 120 diastolic is severe hypertension. Wait a minute and measure again; with symptoms such as chest pain or numbness, call 911.Read the guidearrow_forward

Comparison4 min read

Stage 1 vs Stage 2 Hypertension: Blood Pressure Numbers ComparedStage 1 hypertension is 130–139 systolic or 80–89 diastolic. Stage 2 is 140 or higher or 90 or higher. See examples and why 180/110 is still stage 2.Read the guidearrow_forward

Reference4 min read

Blood Pressure Chart: Normal, Elevated, Stage 1 and Stage 2 ExplainedBlood pressure categories by AHA chart: normal is under 120/80, elevated 120–129 and under 80, stage 1 is 130–139 or 80–89, stage 2 is 140+ or 90+. See how to read yours.Read the guidearrow_forward

Reference4 min read

Average BMR by Age: How Resting Metabolism Changes (Chart)BMR falls 5 kcal a day for every year of age with the same weight and height: a reference man drops from 1,818 kcal at 20 to 1,518 at 80. See the chart for men and women.Read the guidearrow_forward

How-to4 min read

How to Increase Your BMR: What Actually Works (and How Much)Building muscle raises BMR modestly: about 13 kcal per kg of muscle a day against 4.5 for fat, so 5 kg of extra muscle adds roughly 65 kcal a day.Read the guidearrow_forward

How-to4 min read

How to Calculate Your BMR Step by Step (Men and Women)Calculate BMR in four steps: convert units, multiply weight by 10, height by 6.25, subtract 5 x age, then add 5 (men) or subtract 161 (women).Read the guidearrow_forward

Comparison4 min read

Harris-Benedict vs Mifflin-St Jeor: Which BMR Formula Is Better?Revised Harris-Benedict gives 1,439 kcal and Mifflin-St Jeor 1,380 kcal for a 28-year-old woman of 65 kg and 165 cm. See both formulas and a side-by-side table.Read the guidearrow_forward

How-to4 min read

The Mifflin-St Jeor Equation Explained (With Worked Examples)BMR = 10 x weight (kg) + 6.25 x height (cm) - 5 x age + 5 (men) or - 161 (women). Worked examples: a 28-year-old woman gets 1,380 kcal, a 35-year-old man 1,755 kcal.Read the guidearrow_forward

How-to4 min read

The Widmark Formula Explained: How BAC Is EstimatedBAC = alcohol (g) / (body weight (g) x r) x 100 - 0.015 x hours. r is 0.68 for men and 0.55 for women. Worked example: an 80 kg man after 4 drinks is about 0.073%.Read the guidearrow_forward

How-to4 min read

How Long Does It Take to Sober Up? BAC Time to ZeroAt about 0.015% per hour, a 0.08% BAC takes roughly 5.3 hours to reach zero and 0.15% about 10 hours. Rates vary widely, and nothing speeds it up.Read the guidearrow_forward

Reference4 min read

How Many Drinks Does It Take to Reach 0.08% BAC?The peak estimate hits 0.08% at about 2.8 standard drinks for a 160 lb man and 2.3 for a 160 lb woman. See the numbers for 120 to 200 lb and why impairment starts...Read the guidearrow_forward

Reference4 min read

BAC Chart by Weight and Number of Drinks (Men and Women)Estimated peak BAC for 1 to 5 standard drinks at 120 to 200 lb, for men and women, using the Widmark formula. A 160 lb man reaches about 0.085% after 3 drinks.Read the guidearrow_forward

Comparison4 min read

Light Beer vs Regular Beer Calories: How Much Do You Save?A 12 oz light beer (4.2%) has about 106 kcal against 150 for regular (5%): a saving of 44 kcal per drink, or about 11,000 kcal a year at 5 drinks a week.Read the guidearrow_forward

How-to4 min read

Calories in Mixed Drinks: How Mixers Add UpA spirit with 6 oz of regular soda is about 178 kcal: 98 from alcohol plus 80 from sugar. Learn how to count calories in cocktails and mixed drinks.Read the guidearrow_forward

How-to4 min read

How to Calculate Calories in Alcohol (Formula and Example)Calories = volume (mL) x ABV x 0.789 x 7, plus carbs x 4. Worked example: a 12 oz 5% beer has 14 g of alcohol, 98 kcal from alcohol and about 150 kcal in total.Read the guidearrow_forward

Reference4 min read

Calories in Beer, Wine and Spirits: Per-Serving ChartA regular 12 oz beer is about 150 kcal, a 5 oz glass of wine about 114 and a 1.5 oz spirit shot about 98. See the full chart with standard drinks.Read the guidearrow_forward

Reference4 min read

How Old Are You If You Were Born on 29 February? Leap Day BirthdaysLeap day births: the leap year rule, when a leap-day baby legally turns a year older (28 Feb or 1 Mar by local law), and how many real birthdays they have.Read the guidearrow_forward

Comparison4 min read

Korean Age vs International Age: How the Two Systems DifferTraditional Korean age starts at 1 and adds a year every 1 January, making people 1 to 2 years older than international age. South Korea changed in June 2023.Read the guidearrow_forward

Reference4 min read

Age in Days, Weeks and Months: Chart for Ages 1 to 65How many days, weeks and months old is a 1, 5, 10, 18, 30 or 65 year old? Approximate chart using a 365.25-day year, plus how to get your exact count.Read the guidearrow_forward

How-to4 min read

How to Calculate Age From Date of Birth (Years, Months, Days)Step-by-step method to find exact age from a birth date, with a worked example: 14 May 1995 to 5 Feb 2025 is 29 years, 8 months, 22 days (10,860 days).Read the guidearrow_forward

Nutrition3 min read

Best Macro Split for Fat Loss: Ratios and Grams ComparedCompare 30/30/40, 35/25/40 and other macro splits at 2,400 calories, with grams, AMDR ranges and how to set your own.Read the guidearrow_forward

Fitness3 min read

Target Heart Rate by Age: Chart and ZonesMax heart rate is about 220 minus age. See moderate and vigorous target zones by age, the Karvonen method and a worked example.Read the guidearrow_forward

Body composition3 min read

Waist-to-Height Ratio Chart: What Is a Healthy Ratio?Keep your waist under half your height. See the NICE waist-to-height ratio chart, a waist size table by height and a worked example.Read the guidearrow_forward

Body composition3 min read

Healthy Body Fat Percentage by Age and SexHealthy body fat is about 21-32% for women and 8-19% for men in their 20s-30s. See charts by age, ACE categories and how to measure at home.Read the guidearrow_forward

Guide4 min read

How Much Water Should You Drink a Day?About 2.2 L of drinks for women and 3.0 L for men, plus extra for exercise. See the chart, the formula and six quick habits to drink more.Read the guidearrow_forward

Guide4 min read

How Many Calories Should I Eat a Day?Most adults need 1,600 to 3,000 calories a day. See estimated needs by age, sex and activity, plus how to work out your own number.Read the guidearrow_forward

Guide5 min read

How to Calculate Your TDEE (Total Daily Energy Expenditure)TDEE = BMR x an activity factor of 1.2 to 1.9. See the Mifflin-St Jeor formula, a multiplier table, worked examples and how to check your result.Read the guidearrow_forward

Pregnancy5 min read

How to Calculate Your Due Date: LMP, Conception & IVFAdd 280 days to the first day of your last period: 1 March 2026 gives 6 December 2026. Adjust for cycle length, or use conception (+266 days) or IVF dating.Read the guidearrow_forward

Nutrition5 min read

How Much Protein Do I Need Per Day? Chart by WeightMultiply weight in kg by 0.8-2.2 depending on activity: an 82 kg moderately active adult needs about 98-131 g a day. Chart by weight and activity.Read the guidearrow_forward

Budgeting a move5 min read

Moving Cost Calculator: Estimate Your Moving CostsLearn how to estimate moving costs by home size, distance, labor, packing, storage and other expenses with a practical moving cost calculator guide.Read the guidearrow_forward

Car depreciation6 min read

Car Depreciation Chart: Value by Year & How to Calculate ItUnderstand car depreciation by year with a clear value-retention chart, depreciation formula, worked example, and factors such as mileage, condition.Read the guidearrow_forward

Weight loss6 min read

How Many Calories to Eat to Lose 1 Pound a Week?Eat about 500 calories below your maintenance level to lose roughly 1 pound a week. See daily targets by TDEE and weekly rate, with a worked example.Read the guidearrow_forward

Walking & calories5 min read

How Many Steps Burn 100 Calories? Chart by Weight & PaceAbout 2,410 steps burn 100 calories for a 160 lb adult at a moderate pace. See the chart by body weight and walking speed, plus the formula.Read the guidearrow_forward

Pregnancy6 min read

How Much Weight Should I Gain in Pregnancy? Chart by WeekRecommended pregnancy weight gain by pre-pregnancy BMI: 25-35 lb total for normal weight, about 7-12 lb by week 20. IOM chart by week and BMI category.Read the guidearrow_forward

Grades5 min read

What Grade Do I Need on My Final Exam? Formula & ExamplesFind the score you need on your final to reach your target grade. Formula, tables and worked examples, e.g. 82% going into a 30% final needs 92% for an 85%.Read the guidearrow_forward

Body composition2 min read

What Is a Good BMI? BMI Ranges ExplainedA healthy BMI is 18.5 to 24.9. Learn what BMI means, how it is calculated, what the different ranges indicate, and its limitations as a health measure.Read the guidearrow_forward

Screening5 min read

BMI Calculator Guide: What Your Number Really MeansA practical guide to BMI — what it measures, how to calculate it, who it misleads, and which other health metrics to track alongside it.Read the guidearrow_forward

Vehicle ownership2 min read

Car Depreciation Chart 2026 — How Much Value Does a Car Lose Per Year?Car depreciation chart 2026: new cars lose 20-30% in year one, 15-20% per year after. Full breakdown by year, make, and model type. Free depreciation calculator.Read the guidearrow_forward

Budgeting a move2 min read

How Much Does It Cost to Hire Movers? (2026 Guide)Moving costs in 2026: local moves average $800–$2,500, long-distance $2,000–$7,500+. Full breakdown by home size, distance, and service type.Read the guidearrow_forward

Side-by-side comparisons of CalculatePilot with other calculator sites and tools: what each does best, with sources you can check.

Strength training3 min read

Epley vs Brzycki: Which One Rep Max Formula Should You Use?Epley: w x (1 + reps/30). Brzycki: w x 36/(37 - reps). See both side by side with a worked example and which to trust for your rep range.Read the guidearrow_forward

Guide4 min read

BMR vs TDEE: What Is the Difference?BMR is calories burned at rest; TDEE adds digestion and movement. See a worked example, a comparison table and which number to plan your eating around.Read the guidearrow_forward

Borrowing4 min read

Lump Sum vs Monthly Extra Payments on a Loan: Which Saves More?Compare a one-time extra payment, a yearly payment and a monthly extra payment on a $300,000, 6.5% loan: time saved and interest saved.Read the guidearrow_forward

Borrowing4 min read

Interest-Only vs Amortizing Loan: Payment, Balance and Balloon RiskCompare an interest-only, a fully amortizing and a balloon loan on $300,000 at 6.5%: payments, balance after 5 years and the risks.Read the guidearrow_forward

Mortgage4 min read

5/1 ARM vs Fixed-Rate Mortgage: What Happens When the Rate ResetsStress-test a 5/1 ARM against a 30-year fixed on a $320,000 loan: the intro payment, the payment after a reset, and the five-year saving you could lose.Read the guidearrow_forward

Mortgage4 min read

15-Year vs 30-Year Mortgage: Payment and Total Interest ComparedCompare a 15-year and 30-year mortgage on a $320,000 loan: monthly payment, total interest, and how a half-point rate change affects the cost.Read the guidearrow_forward

Education savings4 min read

529 Plan vs Taxable Brokerage Account for College SavingsCompare a 529 plan with a taxable account for college savings: $250 a month at 6% over 18 years, tax avoided, flexibility trade-offs and when a taxable account makes...Read the guidearrow_forward

Borrowing4 min read

Short vs Long Loan Term: Payment and Total Interest ComparedCompare 24 to 84 month terms on a $20,000 loan at 7.5%: monthly payment and total interest, plus how the rate changes the cost.Read the guidearrow_forward

Retirement4 min read

Roth vs Traditional 401(k): Worked Example and How to ChooseCompare a Roth and traditional 401(k) with a worked 30-year example at three retirement tax rates, plus the rules for tax-free Roth withdrawals.Read the guidearrow_forward

Real estate tax4 min read

1031 Exchange vs Selling and Paying Tax: Side-by-Side With NumbersCompare a 1031 exchange with a taxable sale on an $850,000 rental: tax due now, cash to reinvest, trade-offs, deadlines and who it suits.Read the guidearrow_forward

Investing4 min read

Lump Sum vs Dollar-Cost Averaging: Which Grows More?Lump sum or dollar-cost averaging? Compare both with a worked 12-month example at a constant 8% return, plus when spreading out your investing makes sense.Read the guidearrow_forward

UK property tax4 min read

Stamp Duty vs LBTT vs LTT: England, Scotland and Wales ComparedCompare SDLT, LBTT and LTT side by side: residential bands, first-time buyer relief, second-home surcharges and worked examples at £300,000 and £500,000.Read the guidearrow_forward

Comparison6 min read

CalculatePilot vs Calculator.netHow this library differs on formulas, privacy and embeds.Read the comparisonarrow_forward