About ProbabilityKit

ProbabilityKit is an independent collection of free calculators for probability, odds and game mathematics — built to be fast, accurate, and genuinely private.

What we make

Most people who need a quick probability or odds calculation don't want an account, an upload, a paywall or a cookie banner the size of the page. They want the answer, with the working shown, on any device. That's what ProbabilityKit is: a focused toolkit of small, well-made calculators that each do one thing clearly.

Private by design

Every calculator on this site runs entirely in your browser using JavaScript. The numbers you type are never sent to a server, logged or shared — there is nothing to send, because the maths happens on your own device. As a side effect, the tools keep working even if you lose your connection once the page has loaded.

No accounts. No uploads. No tracking of the values you enter. The formula behind every result is shown on the page so you can check it yourself.

Accuracy and transparency

We show the formula for each calculation rather than hiding it behind a black box. If you ever get a result that looks wrong, you can follow the maths step by step — and if you spot a genuine error, we want to hear about it. See our methodology for how the tools are built and checked.

Not advice

ProbabilityKit provides neutral mathematical tools. Nothing here is financial, betting or gambling advice, and the calculators make no recommendation to wager. They are intended for learning, analysis and curiosity.

Questions or corrections? Get in touch.