Method
For equally likely outcomes, probability = favorable outcomes รท total possible outcomes.
Example
Three favorable outcomes among ten equally likely outcomes gives 30% probability.
Limits
Check inputs and units. Important academic, financial or professional decisions should be confirmed against an appropriate source.
Common questions
What does the probability calculator calculate?
Convert favorable and possible outcomes into probability, percent and odds.
Does this probability calculator show its method?
Yes. The result includes the central formula or working needed to check the answer.
Are my values uploaded?
No. The calculation runs in this browser and does not require an account.