PDF Tools Calculators Contact Log In
Result
--
Enter values to calculate.
Summary
--
Waiting for input
Detail
--
Waiting for input

Calculate the probability of getting a specific number of heads in a set number of fair coin flips.

How It Works

How Coin Flip Probability Calculator Works

This uses the binomial probability formula — the number of ways to arrange the chosen number of heads among all the flips, multiplied by the probability of any one specific sequence occurring (0.5 raised to the number of flips, for a fair coin).

FAQ

Frequently Asked Questions

Does this assume a perfectly fair coin?
Yes, each flip is assumed to have an exact 50/50 chance of heads or tails — a real coin can be very slightly biased, but 50/50 is the standard assumption for this kind of calculation.