Combine the chances of two independent events (both, either, neither, exactly one) and see the chance of something happening at least once over several tries.
loading toolHow to use the probability calculator
- Type your numbers in the boxes (pick your currency or units if asked).
- The answer updates as you type: no button to press.
- Copy the result, or share it on WhatsApp with one tap.
Questions
What is the chance of at least one six in 4 dice rolls?
1 − (5/6)⁴ ≈ 0.518, a little better than even.
Is my data private?
Yes. Everything happens inside your own browser: nothing you type or choose is uploaded to us or anyone else.
Is it free?
Completely free, with no sign-up, no watermark and no limit on how many times you use it. Light ads keep the site running.
