Coin Flip
A fair 50/50 flip, decided by your browser’s secure random number generator. No coin required.
Ready to flip
- Heads
- 0
- Tails
- 0
- Flips
- 0
- Heads share
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Is a virtual coin flip actually fair?
Yes — arguably fairer than a real coin. This flip reads a random byte from your browser's cryptographic random source and checks whether it is even or odd, giving exactly 50% for each outcome. A physical coin is very slightly biased: a well-known Stanford analysis found that a coin caught in the hand lands on the same face it started about 51% of the time, because of the way it precesses in flight. A digital flip has no such wobble.
Why long streaks are normal
People assume a fair coin should alternate. It does not, and streaks appear far more often than intuition suggests.
| In 100 flips | Probability of seeing it |
|---|---|
| A run of 5 in a row | ~97% |
| A run of 6 in a row | ~80% |
| A run of 7 in a row | ~54% |
| A run of 10 in a row | ~5% |
A run of six identical results in a hundred flips is more likely than not. If a sequence of coin flips looks suspiciously "random" — neatly alternating, no long runs — that is usually a sign it was made up by a human rather than generated.
The coin has no memory
After five heads in a row, tails is not more likely. The next flip is still exactly 50/50, because the coin carries no record of what came before. Believing otherwise is the gambler's fallacy, and it is one of the most persistent errors in everyday probability reasoning.
What confuses people is regression to the mean, which is real but different. Over thousands of flips the overall proportion does drift towards 50%, not because past results get corrected, but because they get diluted by the sheer volume of new flips.
Flip 10 times and landing 7 heads is unremarkable. Flip 10,000 times and 7,000 heads would be extraordinary — not because the coin evened itself out, but because the early imbalance became statistically insignificant.
How to use the Coin Flip
- Press Flip the coin for a single heads-or-tails result.
- Use Flip 10 to run ten flips at once and watch the tally.
- The running count and heads percentage update as you go.
Frequently asked questions
Is this coin flip really 50/50?
Yes. It reads a cryptographically secure random byte and tests a single bit, which is exactly even. There is no weighting and no hidden pattern.
Can I use it to settle a bet?
For anything informal, absolutely. Because the result is generated on your own device, both parties should be watching the same screen — a flip you report from another room proves nothing.
Are real coins actually biased?
Slightly. Research led by Persi Diaconis found that a spinning coin caught in the hand favours its starting face about 51% of the time. Spinning a coin on a table can be much more biased still, depending on the coin’s edge.
Does the tally reset when I reload?
Yes. Nothing is stored — reloading or closing the page clears the count entirely.
Why did I get eight heads in a row?
Because that happens. In a long session, runs of six, seven or eight are expected rather than surprising. See the streak table above.
Related tools
Last reviewed September 4, 2026. Results are estimates for general information only.