Statistics & Probability
Coin Flip Probability Calculator
Lets users solve and check coin flip probability instantly with formula, steps and examples — no manual math.
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Your result
Probability
24.61%
P(exactly 5 heads in 10 flips) = 24.609%
Favorable sequences
252
Total sequences
1,024
About this calculator
For a fair coin, P(exactly k heads in n flips) = C(n,k) × 0.5ⁿ (binomial distribution). Exactly 5 heads in 10 flips ≈ 24.6% — less than most people expect.
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