Calculator Guides

Each guide is the judgement layer for a calculator: the formula in words, a worked example, and the next tool in the job. Use the matching calculator when you want the number.

Finance & money guides

These sit above the financial calculators. A mortgage payment, a UK repayment versus interest-only split, a debt-payoff date and a student-loan term are different jobs — the guides keep them from cannibalising each other.

Monthly Mortgage Formula Explained Simply → How to Calculate a Mortgage Payment: Formula, Example & Amortization → How to Calculate Percentages — Complete Guide with Examples → Percentage Calculator: Percent, Increase, Decrease & Examples → Moving Cost Calculator: Estimate Your Moving Costs → Cos Inverse -1 = 180° → Car Depreciation Chart: Value by Year & How to Calculate It → 529 Calculator by Age: How Much Should You Save? → Mortgage payment, 15 vs 30 year → UK repayment vs interest-only calculator → UK overpayment calculator → UK stamp duty calculator (England & NI) → Scotland LBTT calculator, home or commercial freehold → Wales LTT calculator, home or commercial freehold → Debt payoff date vs extra payment → Student loan payment guide (US amortisation) → UK student loan PAYE calculator → UK take-home pay (England, Wales & NI) → Scotland take-home pay (six income-tax bands) → SAVE plan deadline: what it means for your payment → Car loan refinance breakeven → VA home loan estimate → Discount and stacked sale prices → Emergency fund months of expenses → 529 college savings → How to calculate compound interest → What is a good DTI? →

Math & conversion guides

Open these when the calculator’s output is a number you still need to interpret — scientific notation, triangle solution, slope, volume, or writing a number in words.

Number to words → Scientific notation → Triangle sides and angles → Slope between two points → Volume of common solids → Height conversion → UTC time conversion →

Health & everyday explainers

BMI and body-composition pages stay screening tools, not diagnoses. Moving-cost and car-depreciation guides explain the estimate so the matching calculator is not asked to double as an article.

What is a good BMI? → BMI calculator guide: what your number means → Car depreciation → Moving cost estimator →

Open the calculator, not another article

Guides do not replace the tool. If you already know the job, go straight to the calculator that produces the number.

Mortgage (PITI) calculator → UK mortgage repayment calculator → UK student loan repayment calculator → UK take-home pay calculator → Scotland take-home pay calculator → Debt payoff calculator → Percentage calculator → Adult BMI calculator →

Explore all calculators →