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Flip a coin

Heads or tails? Tap the coin to toss it. Call it first if you like, flip 10 or 100 at once, and watch the running stats.

Your call

 

Coins per flip
Heads0–
Tails0–
Flips0 
Longest streak0 
History
    Space FlipTap the coin or press Space

    This coin toss uses your browser's cryptographic random number generator, so heads and tails are exactly 50/50 and every flip is independent of the ones before. A real coin is surprisingly close to fair too, but a hand toss can be biased by how you flip and catch it; here there's no thumb involved.

    Settle a bet, decide who kicks off or pick between two options. Choose Heads or Tails before you flip to make a call, and the result tells you if you got it right. Need lots of flips for a probability lesson? Switch to ×10 or ×100 and the counts, percentages and longest streak update instantly. Over a hundred flips you'll usually see a run of five or six in a row, which surprises most people.

    Your history and stats are kept on your device until you reset them. Nothing is sent anywhere.

    How to use it

    1. Optionally pick Heads or Tails as your call.
    2. Tap the coin, press Flip or hit the Space bar.
    3. Read the result, then check the history and stats below the coin.

    Frequently asked questions

    Is this coin flip really 50/50?
    Yes. Each flip takes a fresh value from crypto.getRandomValues, the secure random source browsers use for encryption. There's no pattern and no memory: after five heads in a row, the next flip is still exactly 50/50.
    Is a real coin toss fair?
    Almost. Studies of hundreds of thousands of real tosses found a coin lands on the same side it started on about 51% of the time. An online coin flip removes that small bias.
    How long a streak is normal?
    In 100 flips the longest run of the same side is usually 5 to 7. Streaks feel unlikely, but they're exactly what randomness looks like.
    Can I flip several coins at once?
    Yes. Choose ×10 or ×100 to flip that many coins with one press. The coin shows the last result and the stats include every flip.

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