Flip a Coin
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How to use it
- Press Flip for a single toss.
- Choose a number to flip several coins at once.
- Watch the tally to see how the results even out over many flips.
Examples
Settling a choice
Assign heads and tails before you flip, then press Flip once — each side has exactly a 50% chance.
Seeing probability in action
Flip 100 coins a few times: you'll rarely get exactly 50 heads, but results cluster around it.
Is it fair?
Each flip uses crypto.getRandomValues, the browser's cryptographically secure random source, to choose heads or tails with exactly equal probability. Previous flips have no influence on the next one.
Streaks are normal: in 100 fair flips, a run of six or more of the same side is more likely than not.
Frequently asked questions
Is a real coin flip 50/50?
Very nearly. Studies of physical tosses have found a slight bias toward the side facing up at the start. A virtual flip has no such bias.
If I got five heads in a row, is tails more likely next?
No — that's the gambler's fallacy. Every flip is independent and still 50/50.
Can I flip more than one coin?
Yes, up to 1,000 at a time; the result shows how many came up heads and tails.
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More in Everyday Tools · Last reviewed October 2026