Binomial Probability Calculator
Math ToolsChance of exactly, at most or at least k successes
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History
All history →Binomial Probability Calculator — at a glance
Find the chance of getting k successes in n tries.
How to use it — step by step
Number of trials, success probability and k.
Enter your values
Fill in the fields. Default numbers are shown so you can see how it works.
Press Calculate
The answer appears at once as large result cards.
Copy or share
Copy the result, or share a link that opens with your numbers filled in.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
What is a binomial experiment?+
A fixed number of independent tries, each either a success or a failure with the same chance.
How large can n be?+
Up to 10,000 trials.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.