Go to the coin flip tool and click Flip. The coin shows heads or tails straight away. That’s the whole thing — though there’s more if you need it.
Single flip
The default mode flips one coin at a time. A large circle shows H for heads or T for tails. The coin briefly animates on flip; if you’d rather have an instant result with no motion (due to a vestibular condition or preference), the operating system’s “reduce motion” setting respects that automatically.
Each result is added to the running tally at the bottom, so you can see how many times each side has come up across your session.
Batch mode
Toggle on Flip many and enter the number of coins to flip. Click the button and all results land at once, adding to your tally. This is handy in a few specific situations:
Probability demonstrations. Flip 10 coins and heads might come up 7 times. Flip 1,000 and you’ll land close to 500. Flip 10,000 and the percentage converges tightly on 50%. Batch mode makes this effect visible without tedious clicking.
Simulations. If you’re modelling a scenario where something happens with 50% probability per trial — say, whether a random visitor takes an action — batch flipping lets you build intuition quickly.
Settling debates. Sometimes a single flip feels too arbitrary. Agree to best of 5 or best of 11, then batch-flip the full set. Less room for “best of three” re-negotiation.
Is a digital coin actually fair?
A physical coin isn’t quite 50/50. Research has found that when a coin is spun on a flat surface (rather than flipped through the air), it favours whichever side was face-up when it started. Flipping through the air introduces its own biases from thumb position and catching technique.
The virtual coin here uses crypto.getRandomValues, the same randomness source browsers use for generating secure tokens. The probability of heads is exactly 0.5 by definition, with no physical imperfections to tip the balance.
For anything where the stakes are genuinely equal and you want no room for dispute, a cryptographic coin is more defensible than a physical one.
Practical uses
Deciding small disputes. Who picks the restaurant, who takes the first shift, who sits in the middle seat. Coin flips have settled these kinds of questions for centuries.
Sports and games. Many games begin with a toss. If you’re playing remotely or just don’t have a coin, the tool works as a straightforward substitute.
Random assignment. Splitting a group into two teams when you want equal sizes but no bias in the assignment. Flip for each person: heads goes left, tails goes right.
Commitment device. Sometimes you know what you want but you need something external to confirm it. Flip the coin and notice your gut reaction to the result — if you feel relief at heads, you probably wanted heads.
Teaching moments. Explaining that 60% heads after 10 flips is normal — not evidence of a biased coin — becomes much easier when you can show a live tally converging toward 50% over hundreds of flips.
Reading the tally
The bar between the heads and tails counts shows their relative proportion. Early on it swings around; over hundreds of flips, it settles. The percentage figures update live, so you can watch the law of large numbers in action without any spreadsheet involved.
Click Reset to start a fresh session.