Coin Flip Probability Calculator

Probability of
%

50% for a fair coin.

P(3 or more heads in a row in 10 flips)

50.7813%

Odds
1 in 1.97
Chance it does not happen
49.2188%
Expected heads
5
Chance of 3 heads in a row from a given start
12.5%
Happens: 50.8%Does not: 49.2%
  • Happens0.5150.8%
  • Does not0.4949.2%

Open the full coin flip probability calculator with the formula and FAQs at Calcs for Life