More trials, better estimate
Ten tosses can easily give 7 heads. A thousand will be very close to half. Watch the line settle onto the theoretical probability as the trials add up.
Probability Simulator 🎲
Toss coins, roll dice, spin a spinner or pick counters from a bag — once or a thousand times — and watch the experimental results move towards the theoretical probability.
Up to 1,000 trials
Live charts
Theory vs experiment
Nothing leaves your device
Last result
Tap a row to follow that outcome on the line chart below.
Experiment against theory
Good to know
Two dice are not equally likely
A total of 7 can be made six ways (1+6, 2+5 …) but 2 only one way, so 7 is six times as likely. The two-dice chart shows the triangle shape building up.
Nothing leaves your device
The random results are made in your browser and nothing is saved.
Tool created by
លោក ណាត ប៊ុនឆ័យ · Mr. Nat Bunchhai
Alpha Academy Cambodia
Probability makes more sense when you try it.
Our tutors teach probability from first ideas to Grade 12 counting and conditional probability.