About Calculator Collection

Calculator Collection is a free library of more than 3,670 online calculators spanning math, personal finance, business, statistics, health, science, conversions, and many other everyday topics. Whatever number you are trying to work out, the goal is to have a clear, reliable tool ready for it.

Our purpose

Most calculators on the web give you a single number and leave it at that. We think a good calculator should do more: it should show you what the number means. So alongside each result we aim to provide plain explanations, sensible defaults, and — where it helps — a simple visual breakdown, so the answer actually makes sense rather than appearing out of nowhere. That is the idea behind our tagline: your numbers, finally making sense.

How it works

Every calculator runs entirely in your web browser. The values you enter stay on your device — they are never sent to a server or stored by us. There is no account to create, no sign-up, and no paywall. The Site is free to use, supported by advertising, and open to everyone.

We maintain the calculators continually: fixing formulas, improving explanations, and adding new tools as we find gaps. If you spot something that looks wrong, we genuinely want to hear about it.

Who builds it

Calculator Collection is built and maintained by Emil Björk, based in Gothenburg, Sweden. It started as a single tool and grew, one calculator at a time, into the library it is today.

Get in touch

Suggestions, corrections, or a calculator you wish existed? Email contact@calculatorcollection.org. You can also read our Privacy Policy and Terms of Service.