Fun calculator
Coin Flip Probability Calculator
Calculate the probability of getting exactly a selected number of heads in repeated coin flips.
FormulaProbability = nCk / 2^n
Formula
Coin flip probability
Probability = nCk / 2^n
Exactly 5 heads in 10 flips has probability 10C5 / 1024.
FAQ6 common questions for this calculator.
FAQs
Does this assume a fair coin?+
Yes. It assumes heads and tails are equally likely.
What does exactly heads mean?+
It counts outcomes with exactly the selected number of heads, not at least that many.
How does the Coin Flip Probability Calculator calculate the result?+
For the Coin Flip Probability Calculator, it uses the Coin flip probability: Probability = nCk / 2^n. Exactly 5 heads in 10 flips has probability 10C5 / 1024.
What information do I need to use the Coin Flip Probability Calculator?+
Enter the values requested by the form, keep units consistent, and use the displayed assumptions to decide whether the Coin Flip Probability Calculator matches your scenario.
How accurate is the Coin Flip Probability Calculator?+
Coin Flip Probability Calculator is accurate for the values and assumptions entered on this page. It uses the Coin flip probability. Recheck the inputs before relying on the estimate.
What should I check before using the Coin Flip Probability Calculator result?+
For the Coin Flip Probability Calculator, check that the units, inputs, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
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Fun guide
How to use the Coin Flip Probability Calculator
Calculate the probability of getting exactly a selected number of heads in repeated coin flips. The page also explains the coin flip probability and shows a practical example: Exactly 5 heads in 10 flips has probability 10C5 / 1024.
- 1
Enter your details
Enter the values for the coin flip probability calculator scenario you want to check.
- 2
Check the calculation
Review the result alongside the coin flip probability: Probability = nCk / 2^n.
- 3
Compare scenarios
Change one or more inputs to see how they affect the coin Flip Probability Calculator result before you use the estimate.