A coin flip is a free online tool that instantly simulates the flip of a fair coin — producing a cryptographically random heads or tails result with a single click — while tracking your complete flip history and running statistics including current streak and longest streak.
Physical coin tosses are not perfectly random. Research by Stanford University (Diaconis, Holmes, Montgomery 2007) demonstrated that coins have a ~51% same-side bias — they land slightly more often on the same face they started on. A 2023 study with 350,757 flips confirmed this at approximately 50.8%.
A digital coin flip using a CSPRNG produces exactly 50.000% probability for each outcome — no physical bias, no precession, no catcher influence.
| Consecutive Heads | Probability |
|---|---|
| 1 | 50% |
| 3 | 12.5% |
| 5 | 3.125% |
| 7 | 0.78% |
| 10 | 0.098% |
💡 The Gambler's Fallacy: After 9 consecutive heads, the probability of the 10th flip being heads is still exactly 50%. The coin has no memory. Each flip is completely independent of all prior results.
Yes. The coin flip uses the browser's crypto.getRandomValues() API — a cryptographically secure random number generator. Each flip produces heads or tails with exactly 50% probability, with no bias, no pattern, and no influence from previous results.
Streaks are a normal, expected feature of genuinely random binary sequences. In 10 flips, there is approximately a 69% chance of seeing a streak of 3 or more consecutive identical results. Long streaks feel surprising but are completely consistent with fair, random coin flipping.
For strict fairness, yes. Research shows physical coin tosses have a measurable same-side bias of ~50.8%. A digital coin flip using a CSPRNG produces an exactly 50/50 result with no physical bias.
No signup required. No downloads. Works instantly on any device — desktop, tablet, or phone.
Open Coin Flip — Free →