Coin Flip Probability Calculator
Compute the probability of k heads in n fair coin flips.
Input Data
Flips
Results
Probability of exactly half heads (or configured k).
4
Explanatory note about the result.
正面 4 次，反面 6 次（共 10 次，比例 40.0% / 60.0%）。
At a glance:For a fair coin, P = C(n,k)·(0.5)^n where k is the number of heads. Complements combination and dice calculators.
Formula
P(k heads) = C(n,k) · 0.5ⁿ.
How to Use
- Enter the number of flips.
- The tool returns the probability.
Case Studies
n=10, k=5
P = C(10,5)·0.5^10 = 252/1024 ≈ 0.246.
FAQ
Why 0.5^n?
Each flip is independent with two equally likely outcomes.
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References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.