Toolstia / Coin flip
Flip a coin
Press the button to flip a coin and get heads or tails. You can also flip many coins at once and see how many land each way, which is handy for probability lessons.
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Flip the coin to start.
How it works
- Choose how many coins to flip.
- Press Flip.
- Read the result and the running tally.
A fair flip
Each coin is decided with your browser's secure random number generator, so heads and tails each have a 50% chance, and a flip is never affected by earlier flips.
Why streaks happen
Real random flips often show runs of the same side. Five heads in a row is not a sign of a broken coin: it happens in about 3% of five-flip runs.
Flipping many coins
With many coins the share of heads gets close to 50%, but it is rarely exactly 50%. Try 1000 coins to see this law of large numbers at work.
Running tally
The tally keeps adding up until you press Reset, so you can see the long-run split.
Questions
Is it really 50/50?
Yes. The coin has two outcomes with equal chance.
Can I use it to make decisions?
Yes, though for more than two options try the Spin the wheel tool.
Why does the tally not match 50%?
Short runs of random flips drift from an even split. The gap shrinks as the number of flips grows.
Is anything stored?
No. The results exist only on this page.