About
Calculate

What this is

Calculate is a collection of 70+ free calculators for the math of everyday life — money, health, home, school, kitchen, cars and dates. Every tool runs instantly in your browser, works on any device, and asks for nothing: no account, no pop-ups, no ads chasing you down the page.

Who builds it

Calculate is built and maintained by an independent developer and engineer in the United Kingdom. It is a small operation on purpose — one person who cares that the numbers are right and the pages are calm.

How the numbers are checked

Every calculator's math is verified against known benchmarks before it ships: loan payments against standard amortization tables, the inflation tool against published BLS CPI figures, health formulas against their original published equations (Mifflin–St Jeor, the US Navy method, Epley and Brzycki, Naegele's rule). Where a formula is an estimate, the page says so plainly and explains its limits — you will find honest caveats on this site, not false precision.

What the tools are not

These are educational tools, not professional advice. Financial pages are not financial advice; health pages are not medical advice; pregnancy dates are estimates your provider will refine. For decisions that matter, the calculators give you the right starting number — a professional gives you the answer for your situation.

Contact

Questions, corrections, or a calculator you wish existed: business@luck.fyi. Corrections are taken seriously and fixed fast.