Flip a coin
Tap Flip for heads or tails. Each flip is a fair 50/50 draw, and the count below keeps track of your streak.
Runs in your browser. Nothing is sent to a server.
Is it fair?
Yes. Each flip takes a number from your browser's cryptographic random generator and turns it into heads or tails with exactly equal odds, so there is no pattern to learn and no hidden bias. A real coin is close to fair too, though studies of hand-tossed coins have found a slight tendency to land on the side that started facing up.
Streaks are normal
Five heads in a row feels suspicious, but it isn't. Each flip is independent, so a run of five of the same side has a 1 in 16 chance starting from any flip, and in 100 flips you will usually see a run of six or more. The count under the result shows how heads and tails even out as the number of flips grows.
| Flips | Chance of all the same side |
|---|---|
| 2 | 1 in 2 (50%) |
| 3 | 1 in 4 (25%) |
| 5 | 1 in 16 (6.25%) |
| 10 | 1 in 512 (about 0.2%) |
Questions
Can I flip more than one coin?
Yes. Set Coins to any number up to 100. The result shows how many came up heads and tails, and every flip is added to the running count.
How do I use it to decide something fair?
Agree which side means what before you tap Flip, then flip once. For more than two choices, use the random name picker instead.
Is anything saved?
No. The count stays only while the page is open.