Probability Calculator
Calculate probabilities, permutations and combinations.
Combinations & permutations
Single-event probability
Calculate probabilities, permutations and combinations. Probability Calculator is a free, browser-based tool in the Toolsnest statistics collection — there is nothing to install, no account to create and no watermark on your results. It works on desktop, tablet and mobile, and because the work happens on your own device it stays fast even with large inputs.
How to use the Probability Calculator
- Open the Probability Calculator in your browser — it loads instantly and works offline once cached.
- Enter your values in the input fields. Every field is labelled so you know exactly what to type.
- The result updates automatically as you type — there is no "submit" round-trip to a server.
- Adjust any input to compare scenarios and see how the outcome changes in real time.
- Copy or note the result. Nothing you enter is stored or sent anywhere.
Why use the Probability Calculator?
- 100% free with no limits, no sign-up and no watermarks.
- Private by design — your data are processed in your browser and never uploaded to a server.
- Fast and lightweight, with instant results even on a phone or a slow connection.
- Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
- Part of a full statistics suite, so related probability tasks are one click away.
Is it private and secure?
Your privacy is built in. The Probability Calculator runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.
Frequently asked questions
Is the Probability Calculator free to use?
Yes. The Probability Calculator is completely free with no usage limits, no sign-up and no watermarks. Every feature is available to everyone.
Is my data sent to a server?
No. The Probability Calculator works entirely inside your browser, so your data never leave your device. Nothing is uploaded, stored or shared.
Do I need to install anything or create an account?
No installation and no account are needed. Open the page in any modern browser and start using the Probability Calculator straight away.
Does the Probability Calculator work on mobile?
Yes. It is fully responsive and works in the browser on Android and iOS phones and tablets, as well as on desktop.
Will it work offline?
Once the page has loaded, the Probability Calculator keeps working even if your connection drops, because all the processing runs on your device rather than on a server.