How to use the coin flip
- Press the coin, the Flip button or the space bar.
- Read heads or tails; the tally on the right keeps count.
- Use Flip many with a number to flip ten, a hundred or a thousand coins at once.
A fair coin, on purpose
A real coin is very nearly fair but not quite: a 2023 study of 350,000 tosses found a small bias towards the side facing up at launch. A virtual coin has no such edge. Each flip here takes one random bit from the browser's cryptographic generator, the same source used to make encryption keys.
When to use it
Choosing who goes first, settling a two-way decision, breaking a tie, or showing a class why ten flips rarely give exactly five heads while ten thousand give very close to half.
Questions and answers
Is the coin flip really 50/50?
Yes. Each flip reads one bit from the browser's cryptographic random generator, which has no bias towards heads or tails and no memory of the previous flip. The animation is decided after the result, so what you see is what was drawn.
Can I flip many coins at once?
Yes. Choose how many in the box and press 'Flip many'. You get the count of heads and tails and the running tally, which is handy for probability lessons.
Why does my tally drift from 50%?
Small samples wander. After 10 flips, 7 heads is common; after 1,000 flips the share settles near 50%. Try it with 'Flip many' and watch the percentage converge.
Does it work offline?
Once the page has loaded, yes. Nothing is sent to a server.
Free to use, runs in your browser, nothing uploaded. Last updated 2026-10-07. Made by HandyToolkits; questions to [email protected].