Coin flip
Flip one or several coins with a tap.
- Flip up to 10 at once
- Running heads and tails count
- Recent flip history
How to flip a coin online
- Set how many coins to flip at once.
- Click Flip.
- Read the result and your running totals below.
How the result is decided
Each coin gets heads or tails from your browser's cryptographic random number generator, the same source used to generate encryption keys. That makes every flip an independent 50/50 choice with no memory of the last one, unlike a physical coin, which carries a tiny bit of physics bias from how it starts and spins.
A 2023 study that tracked 350,757 real coin flips found a coin lands on the same side it started facing about 50.8 percent of the time, matching a physics model first proposed by mathematician Persi Diaconis. A simulated flip like this one has no starting side to bias it.
Odds with more than one coin
Flipping several coins at once multiplies the odds together. Here is how often you should expect every coin to land on the same side.
| Coins flipped | Chance all land heads | Chance all land tails |
|---|---|---|
| 1 | 50% | 50% |
| 2 | 25% | 25% |
| 3 | 12.5% | 12.5% |
| 5 | about 3.1% | about 3.1% |
| 10 | about 0.1% | about 0.1% |
The running heads and tails count on this page is a good way to watch that math play out. Short streaks of the same result are completely normal and get rarer the more coins you flip in one batch.
Common uses for a coin flip
- Deciding who goes first in a board game, a coin toss in football or cricket, or a friendly bet, without either side having an edge.
- Teaching probability in class: flip a batch of coins and compare the actual heads and tails count to the expected 50/50 split.
- Breaking a tie between two options when you do not want to overthink the choice.
- Quick random A/B decisions, like which task to start first or who takes out the trash.
Coin flip FAQ
Is this a fair 50/50 coin flip?
Yes. Each coin lands on heads or tails with equal probability, chosen by your browser's cryptographic random number generator rather than a physics simulation.
Why isn't it exactly 50/50 after a few flips?
Short streaks are normal with a fair coin. Flip a few dozen times and the heads and tails counts settle much closer together.
Are multiple coins flipped independently?
Yes. Each coin in a batch gets its own random result, just like flipping several real coins at once.
Can I use this to settle a decision?
Yes, it works well for any two-option choice. For a text-based yes or no with a maybe option, try the yes or no wheel instead.
Is a real coin flip actually 50/50?
Close, but not quite. A 2023 study that recorded 350,757 real coin flips found a coin lands on the same side it started facing up about 50.8 percent of the time, a tiny bias from the physics of the toss. This tool has no such bias, since a coin is not physically spun.
What are the odds of flipping all heads?
Each extra coin cuts the odds in half. 2 coins land all heads about 25 percent of the time, 5 coins about 3 percent, and 10 coins about 0.1 percent, since the chance is 1 divided by 2 to the power of the coin count.
Why do sports use a coin toss to decide who goes first?
It gives both sides an equal, tamper-proof chance with no skill involved, which is why it is used before football, cricket and tennis matches to decide serve, ends or kickoff.
Does it simulate a spinning or wobbling coin?
No. It picks heads or tails directly with an equal chance, rather than simulating a physical toss, so there is no visual spin physics to skew the result.