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Site Statistics
Real-time data from every coin flip performed on Flip a Coin.com since January 26, 2024. Snapshot refreshed daily.
347,595,127
total flips performed
886 days · avg 392,320 / day
Heads vs Tails
An honest random coin flip should converge to 50% / 50% over many trials. Here is the live result of every flip on this site.
50.00%
Heads
173,791,769
50.00%
Tails
173,803,358
Result is essentially 50 / 50 (within 0.01 percentage points).
Distribution Pie
Law of Large Numbers live simulation
This chart runs fresh in your browser each visit, using the same cryptographic RNG (crypto.getRandomValues) that powers single flips on this site. Watch 1,000 simulated fair flips: the proportion of heads (cyan line) bounces wildly at first, then settles toward 0.5 (gold dashed line). Reloading the page generates a new random sequence — that's the demonstration. The math says any fair generator will show this convergence; refresh and see for yourself.
Learn more about the Law of Large Numbers in the classroom simulator article →
Random Walk live simulation
Same fresh simulation as the chart above (same cryptographic RNG), plotted differently. While the proportion of heads converges to 0.5, the count difference (heads minus tails) does not return to zero. It performs a random walk, drifting away from zero like the steps of a person without a destination. The gray band shows the ±2σ envelope, which contains the trajectory with about 95% probability for a fair coin. Reload to see a new walk.
After 100 fair flips, the expected gap between heads and tails is not zero but rather about 8. After 10,000 flips, the expected gap grows to about 80. The proportion shrinks because the denominator grows faster than the gap — not because the gap itself shrinks.
Is the coin truly fair? live site data
A 50 / 50 split is the headline, but how do we prove the coin is fair? With 347,595,127 flips on record, we can apply two standard tests from inferential statistics: the Z-test for a proportion and the chi-squared goodness-of-fit test. Both ask the same question — “could random chance alone produce the bias we observe?” — and arrive at the same answer.
| Total flips (n) | 347,595,127 |
|---|---|
| Heads observed | 173,791,769 (p̂ = 0.499983) |
| Expected under fair coin (n · p) ? | 173,797,564 |
| Standard deviation (σ = √(np(1−p))) ? | 9,321.95 |
| Z-score ((X − np) / σ) ? | -0.622 |
| Chi-squared statistic (df = 1) ? | 0.386 |
| Two-tailed p-value ? | 0.534207 |
| 95% confidence interval for p ? | [0.499931, 0.500036] contains 0.5 ✓ |
| Verdict ? | Fair — The observed bias is consistent with a 50/50 coin. There is no statistical evidence of unfairness. |
The Z-test and chi-squared test are asymptotically equivalent for two categories; Z² = χ²(df = 1). The p-value is computed from a normal approximation, accurate to about 7 decimal places at this sample size. With 347,595,127 flips, the test is so sensitive that any deviation greater than about 18,271 flips (just 0.0053% of all flips) would register as statistically significant — yet such a tiny deviation is meaningless in practice. Statistical significance does not mean practical bias.
See the interactive simulators behind these tests in our classroom article →
Top 10 Most Popular Coins
Top 10 Flip Counts
Most popular flip counts chosen by users — number of times each count was selected.
API Usage /api/flip
Flips performed via the public JSON API at /api/ — primarily by AI assistants and integrated apps. Counted separately from on-site and widget flips.
1,022,472
flips via API
210 requests · 511,528 heads / 510,943 tails
Top Coins (API)
| Coin | Heads | Tails | Flips |
|---|---|---|---|
| fcc-heads-or-tails | 511,449 | 510,867 | 1,022,317 |
| fcc-yes-or-no | 61 | 54 | 115 |
| usd-25cent | 7 | 8 | 15 |
| ccc-bitcoin | 1 | 2 | 3 |
| fcc-go-or-stay | 2 | 0 | 2 |
| ccc-cardano | 0 | 1 | 1 |
| usq-texas | 1 | 0 | 1 |
| fcc-hot-or-cold | 0 | 1 | 1 |
| fcc-outdoor-or-indoor | 0 | 1 | 1 |
| fcc-play-or-work | 1 | 0 | 1 |
Integrate the API in your app or AI assistant: see /api/ (developer docs) or /ai-integration/ (Claude Desktop / ChatGPT setup).
Embed Widget Usage /widget/
Flips performed via the embeddable widget on third-party sites. Counted separately from on-site flips.
12
flips via embed
12 actions · 7 heads / 5 tails
Get your own embed at /widget/.
Snapshot updated: Jun 30, 2026 03:00 UTC. Refreshed daily at 03:00 UTC.