Coin Flip Probability Calculator

Yes. It assumes heads and tails are equally likely.

It counts outcomes with exactly the selected number of heads, not at least that many.

It uses the Coin flip probability: Probability = nCk / 2^n. Exactly 5 heads in 10 flips has probability 10C5 / 1024.

Calculate the probability of getting exactly a selected number of heads in repeated coin flips.

Coin Flip Probability Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.

Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.