onlinecalculatorsite.com is a free set of calculators for money, health, maths, conversion and everyday questions.
There is no sign-up, no email to hand over and nothing to install. Every calculator runs in your browser, which means nothing you type is sent anywhere or stored — not by us, not by anyone.
How the calculators are built
Each one is written and checked individually rather than generated in bulk. Where a result depends on published rates or standards — HMRC thresholds, a recognised formula, a defined conversion factor — the page says which figures it uses and when they were last reviewed, so you can check them rather than take our word for it.
The UK tax calculators follow HMRC rates for the current tax year. The conversion factors are the exact defined values, so a mile is 1.609344 kilometres rather than a rounded 1.61. The maths calculators show their working where it helps.
What we will not do
We do not ask who you are, and we do not want to know. The calculators need numbers, not names. There is no account to create and no data to lose.
We also try not to overstate what a calculator can tell you. BMI is a rough screening measure, not a diagnosis. A take-home pay estimate cannot see your actual tax code. Where a figure has real limits, the page says so rather than presenting a number as more certain than it is.
Getting it wrong
A calculator that is quietly inaccurate is worse than no calculator at all, so if you spot something wrong we would rather hear about it. Tell us which calculator, what you entered and what you expected, and we will check it.
Contact: [YOUR CONTACT EMAIL]
The site
onlinecalculatorsite.com is independently run and free to use. It is a growing project — new calculators are added regularly, and the full list is on the all calculators page.