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Coin Flip

Flip a fair virtual coin — or up to 100 at once — with every result shown, the heads/tails tally, and the odds of an all-same run.

Written by Jude Ramsey · Last updated August 2026 · How these calculators are checked

A fair coin, on demand

Heads or tails settles more decisions than any committee. This flipper draws each coin from an independent 50/50, shows every result, tallies heads against tails, and — for multi-coin flips — prints the odds of everything landing the same way, which is the number that makes streaks feel less spooky.

How to use it

  1. Choose how many coins (1 for a decision, more for experiments).
  2. Hit “Flip again”.
  3. Read the result, the tally, and the all-same odds.

The math of streaks

P(all n coins match) = 1 in 2ⁿ⁻¹

A worked example

Flip five coins and the chance they all land identically is 1 in 16 — uncommon, not miraculous, which is roughly how often “impossible” streaks should be read. Ten heads in a row genuinely is 1 in 512 from a fair start; but ask “did a streak of ten happen somewhere in my thousand flips?” and the answer is: almost certainly. Rarity depends entirely on how the question is framed.

Common questions

Is a real coin flip actually 50/50?
Very nearly — physical studies find a tiny bias toward the side facing up at launch, on the order of half a percent. This virtual flip has no such physics: each result is an independent 50/50 draw.
After five heads, is tails “due”?
No — each flip is independent, and the coin has no memory. Feeling otherwise is the gambler’s fallacy, and it is the most expensive intuition in probability.
Best of three or single flip?
For a fair coin they’re equally fair — best-of-three just takes longer and feels more ceremonial. For settling arguments, ceremony has its uses.

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