Coin Histogram

Flip up to forty coins at a time, watch the heads totals pile into a histogram, and compare the live data to the binomial curve.

Coins per flip · 10 coins

Flips per run · 100 flips

Show expected curve

Flip the coins to see them tumble.

Slide Coins per flip to decide how many coins launch together.
Choose how many Runs should happen each time you press Play. Smaller runs are easy to follow; giant runs build smoother bars.
Press Play to toss them. The tray shows how many landed on heads and the matching bar climbs up.
Pause and resume whenever you want to make a prediction, change a slider, or talk through what you see.
Hit Reset if you want a totally clean chart with new settings.

Every coin is a tiny 50/50 experiment, so you can explore fairness in real time.

When you flip lots of coins, around half of them should be heads. Watch how close you get.
Short runs wiggle a lot, while huge runs smooth out the bumps.
Changing the number of coins widens or narrows the spread of possible results. Try 5 coins versus 40 coins!

Before each run, guess how many heads you expect. Were you close?