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Coin Toss History & Statistics - Online Fairness Tracker

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Coin Toss History & Statistics

Track, visualize, and analyze your coin flips. Test fairness with real statistics.

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Please enter valid characters: H or T.
Toss History (0)
No flips yet. Start flipping!
Heads

0

0%
Tails

0

0%
Max Heads Streak

0

Max Tails Streak

0

Fairness Test (Binomial, normal approximation)

Null hypothesis: coin is fair (p = 0.5). Two‑tailed test.

Not enough data. Flip at least once.
Observed heads ratio: - z‑score: - p‑value: -
Heads
Tails

Frequently Asked Questions

It checks whether the observed number of heads deviates significantly from the expected 50% under a fair coin. A small p‑value (<0.05) suggests the coin (or the tossing process) may be biased.

It depends on the bias. Small biases need hundreds or thousands of flips. Our tool uses a normal approximation, which works well for more than ~30 flips. For very small samples the result is just an indication.

Absolutely. Switch to Manual Entry and type H or T exactly as they occurred. The statistics and fairness test will be applied to your real‑life data.

It is the probability of seeing a result as extreme as yours (or more) under a fair coin. If p < 0.05, statisticians often reject fairness. If p > 0.05, the data are consistent with a fair coin.

It uses JavaScript's Math.random(), which is suitable for statistical demonstrations but not cryptographically secure. For critical applications, use a hardware generator.

Yes, click the Export button to download a CSV file with your entire toss history, including index and result (H/T).
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