Short answer
- check_circleNeed the widest possible library from a long-established site? Calculator.net is bigger (around 200 calculators).
- check_circleNeed UK-aware tools, a published methodology, or calculators you can embed on your own site? CalculatePilot is built for that.
- check_circleFor standard maths (mortgage payment, BMI, percentages) both use the same textbook formulas, so identical inputs should give matching answers.
By Suhaib Hassan, founder of CalculatePilot. Disclosure: CalculatePilot is our site, so we have tried to stick to facts you can verify yourself and to say plainly where Calculator.net is ahead.
1. At a glance
| CalculatePilot | Calculator.net | |
|---|---|---|
| Number of calculators | 160+ | Around 200 (per its homepage) |
| Main categories | Financial, Health & Fitness, Math, Everyday | Financial, Fitness & Health, Math, Other |
| Price | Free (paid Pro tier for white-label embeds) | Free, no registration required (per its homepage) |
| Calculation runs | In your browser | Not stated on its homepage |
| Published methodology page | Yes: named formula, 3-point baseline testing, sources on each page | States each calculator is individually coded and tested |
| UK-specific tools | Yes, e.g. UK Stamp Duty | Not on its homepage list |
| Embed / extensions | Embeddable calculators, WordPress plugin, Chrome and Firefox extensions | Not covered here: check its terms of use |
| Supporting guides | Worked-example guides for many calculators | In-depth information on its calculator pages |
Calculator.net details are taken from its own homepage and about text, checked 2 October 2026. We did not scrape or benchmark its outputs. If a figure has changed since, trust the source.
2. Library size and categories
Calculator.net says it has around 200 calculators across finance, fitness, health, math and "other". Its homepage lists staples like Mortgage, Loan, Auto Loan, Retirement, Amortization, BMI, Calorie, Body Fat, Scientific, Fraction, Percentage, GPA, Concrete and Subnet calculators. That is a broader catalogue than ours, and if your calculator is niche, it is worth checking there too.
CalculatePilot has 160+ calculators in four groups: Financial, Health & Fitness, Math and Everyday. We would rather ship fewer tools with the formula and assumptions shown than chase a bigger number.
3. Same calculator, both sites
These are tools that appear on both sites. For each, the underlying maths is standard, so any difference between results comes from inputs, rounding or extra options.
| Calculator | CalculatePilot | Typical use |
|---|---|---|
| Mortgage | Mortgage calculator | Monthly payment, total interest |
| Amortization | Amortization calculator | Payment-by-payment loan schedule |
| Compound interest | Compound interest calculator | Savings and investment growth |
| BMI | BMI calculator | Weight-to-height category check |
| Calorie | Calorie calculator | Daily energy estimate |
| Percentage | Percentage calculator | % of, % change, what % is A of B |
| Scientific | Scientific calculator | Trig, logs, powers, brackets |
| Age | Age calculator | Exact age in years, months, days |
| GPA | GPA calculator | Grade-point average |
4. Check it yourself: a worked example
You do not have to take either site's word for it. Run this on both and compare.
Inputs: $300,000 loan, 6.5% annual rate, 30 years (360 payments), no taxes or insurance.
| Result | Value |
|---|---|
| Monthly principal and interest | $1,896.20 |
| Total paid over 30 years | $682,633.47 |
| Total interest | $382,633.47 |
If a calculator returns a different payment, check whether it is adding property tax, insurance, HOA fees or PMI by default. Those extras explain most "mismatches". The same idea applies to BMI: 70 kg at 175 cm gives 22.9 on any correct calculator, because it is weight ÷ height².
5. Where CalculatePilot is stronger
- Published methodology. Our methodology page explains that each calculator is built from a named formula and checked against at least three known correct results before publishing.
- UK coverage. Tools such as the UK Stamp Duty calculator reflect UK rules rather than US ones.
- Embeds and extensions. Website owners can use our embeddable calculators, and there are browser extensions and a WordPress plugin.
- Worked-example guides. See our guides for real-number walkthroughs, such as how the mortgage calculator works.
6. Where Calculator.net is stronger
- Bigger catalogue. Around 200 calculators versus our 160+, including niche tools like Concrete and Subnet calculators.
- Established brand. Its copyright line on the homepage runs from 2008, so it has a long history and a lot of user familiarity.
- Familiar US-style finance set. Its homepage lists Income Tax, Sales Tax and Auto Loan calculators, which suit US users.
7. Which should you use?
| If you want to... | Best pick |
|---|---|
| Find a niche or unusual calculator | Check Calculator.net first, then CalculatePilot |
| Work out UK Stamp Duty or other UK-specific figures | CalculatePilot |
| Understand the formula and assumptions behind a result | CalculatePilot (methodology plus guides) |
| Add a calculator to your own website | CalculatePilot embeds or the WordPress plugin |
| Do a quick standard calculation (percentage, BMI, mortgage) | Either: results should match with the same inputs |
Our suggestion: use both, and when a result matters (a mortgage, a tax figure, a health decision), cross-check it on a second calculator and with a professional.
8. Frequently asked questions
Is CalculatePilot better than Calculator.net?expand_more
Neither is better for everyone. Calculator.net has a larger library (around 200 calculators according to its own homepage) and a long track record. CalculatePilot has 160+ calculators, a published methodology page, UK-specific tools such as a Stamp Duty calculator, and embed options for website owners. Choose by the calculator you need and the region you are in.
Is Calculator.net free to use?expand_more
Yes. Calculator.net states on its homepage that its tools are free with no registration required. CalculatePilot's calculators are also free to use; a paid Pro tier exists for white-label embeds.
Do both sites use the same formulas?expand_more
For standard calculations such as a fixed-rate mortgage payment, BMI or percentage change, both sites rely on the same textbook formulas, so results should match when you enter identical inputs. Differences show up in assumptions: rounding, tax rules, fees and which region's rules apply.
Which site has more calculators?expand_more
Calculator.net, with around 200 calculators as stated on its homepage, versus 160+ on CalculatePilot. Raw count is only one factor: what matters is whether the specific calculator you need exists and explains its assumptions.
Can I put a calculator on my own website?expand_more
CalculatePilot offers embeddable calculators and a WordPress plugin. See the CalculatePilot embed page for current options. Check Calculator.net's own terms of use before copying or embedding anything from it.
Calculators provide estimates only and are not financial, tax, legal or medical advice. Calculator.net is a separate third-party website with no affiliation to CalculatePilot.