Flip a virtual coin — single flips, best-of series and full history.
Heads or tails? For a best-of series, the first side to win a majority takes the series — so a best-of-5 can end 3–1 without playing all five flips. Every flip is independent: past flips never change the next odds, which stay 50/50.
Honest note: this flipper uses your browser's built-in Math.random. That is fine for games and decisions, but it is NOT cryptographic randomness — do not use it for gambling, lotteries or anything where real money or security depends on the result.
Latest result
How to use this tool
Single flip for a quick decision, or best of 3, 5 or 10 when you want a series winner instead of one lucky bounce.
Press “Flip the coin”. The result, the running heads/tails tally and the full history update instantly.
In a series the first side to a majority wins — a best-of-5 ending 3–1 is over, because the trailing side cannot catch up.
Press “Copy result” or “Share” to send the outcome to whoever you are deciding with.
Formula & worked example
Example series with a fixed random sequence (0.1, 0.8, 0.2): flip 1 is Heads (0.1 < 0.5), flip 2 is Tails (0.8 ≥ 0.5), flip 3 is Heads (0.2 < 0.5) — so a best-of-3 ends Heads 2–1. With a truly random generator every sequence like this is equally likely.
Limitations — read this before you rely on it
This flipper uses the browser's Math.random, which is a pseudo-random generator, not a cryptographic one — fine for games and everyday decisions, but never use it for gambling, lotteries or security decisions. Flips are independent: five heads in a row does not make tails “due” — the next flip is still 50/50.
Frequently asked questions
Yes for everyday purposes: each flip has an equal chance of heads or tails, and past flips never change the next odds.
The first side to 3 wins takes the series. It can end 3–0, 3–1 or 3–2; a 3–1 series stops early because the trailing side cannot reach 3.
That is exactly what it is for — who starts a game, who picks the film, who does the washing up. A single flip settles it in seconds.
It uses your browser's Math.random, which is pseudo-random: unpredictable enough for games, but not certified for gambling or security use.
No. That is the gambler's fallacy — every flip is independent, so after five heads the next flip is still 50/50.