PMATH
Probability Calculator
Calculate simple probability from favorable outcomes and total possible outcomes.
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Formula
Probability = favorable outcomes ÷ total outcomes; percentage = probability × 100.
Probability = favorable outcomes ÷ total outcomes; percentage = probability × 100.
How it works
1
Enter the favorable outcomes.
2
Enter the total possible outcomes.
3
Review probability as a decimal and percentage.
Important notes
This calculator assumes each outcome is equally likely.