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Coin Flip Simulator

Flip one coin or simulate up to 1000 flips with heads / tails counts and percentages

Flips:
Generated output

Output will appear here...

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What is Coin Flip Simulator

Written by Giorgos Kostas. Last reviewed:

Coin Flip Simulator produces a sequence of heads (H) and tails (T) results using Math.random. You can flip once for a fast decision or run up to 1000 flips at a time to watch the heads/tails percentages converge toward 50/50.

It's ideal for lightweight decision-making, probability demos, and classroom exercises on the law of large numbers.

Why use it

  • Break a tie quickly without pulling out real coins.
  • Demonstrate probability convergence in class.
  • Run statistical warm-up exercises.
  • Share fair randomised picks in team chat.
  • Model binary outcomes in data science demos.

Features

  • 1–1000 flips per run
  • Heads / tails counts & percentages
  • Math.random pseudo-randomness
  • All Coin Flip Simulator work stays on your device
  • Great for probability demos

How to use Coin Flip Simulator

  1. Enter flips. Type a number (e.g. 1 or 100).
  2. Click Run. See the sequence, plus heads/tails totals.
  3. Re-roll as needed. Each click resamples a fresh batch.

Example (before/after)

Input

10

Result

Flips (10):
H T H H T H T T H T

Heads: 5  (50.0%)
Tails: 5  (50.0%)

Common errors

More than 1000 flips

Very large simulations are capped.

Fix: Limit input to 1000 or re-run the tool multiple times.

Pseudo-randomness

Math.random is pseudo-random.

Fix: That's good enough for decisions and classroom demos; use crypto for fair gambling.

FAQ

How many flips at once?

Between 1 and 1000.

Is the randomness fair?

Math.random approximates a fair coin — expect ~50/50 on large samples.

Do percentages update live?

They're computed once per run — click Run again to resample.

Is it cryptographically secure?

No — use a CSPRNG-backed tool for cryptographic randomness.

Is input uploaded?

No — everything is client-side.

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