Flip 100 fair coins in one click and see the heads/tails split — great for probability demos, all in your browser.
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Flipping a coin 100 times
Flipping a coin 100 times is a classic way to see probability in action: with a fair coin you expect roughly 50 heads and 50 tails, but rarely exactly, and the split wanders from run to run. This page is preset to flip 100 coins at once and reports how many landed heads, how many tails, and the heads percentage. Because it uses cryptographic randomness, the coins are genuinely fair, and the running tally lets you watch the average settle toward 50% over repeated runs.
Frequently Asked Questions
How do I flip a coin 100 times?
Just press Flip — the count is already set to 100, so all 100 coins are flipped at once and you see the heads and tails totals with the heads percentage. Press again to add another 100 to the running tally. Each of the 100 coins is drawn from its own random byte, so the batch is 100 independent flips rather than one result repeated.
Should I get exactly 50 heads and 50 tails?
Usually not exactly. A fair coin averages 50/50 over the long run, but any single set of 100 flips commonly lands anywhere from about 40 to 60 heads. Run it several times and the overall average moves closer to 50%.
How likely is exactly 50 heads out of 100?
Landing on exactly 50 heads in 100 flips happens about 8% of the time — it is the single most likely result, but it is still the exception. Around 95% of 100-flip runs finish between 40 and 60 heads. Anything outside roughly 35 to 65 is rare enough to be worth a second look.
Does the tally reset between runs of 100?
The heads and tails tally keeps adding up across every press, so three presses of the 100-coin flip give a running total out of 300. Press Reset to clear it and start counting from zero again. Reloading the page also starts a fresh tally, because nothing is stored between visits.