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Instant result
The result is updated directly from the data entered.
Online Calculator
Simple probability calculator
Enter the number of favorable outcomes and total possible outcomes to find the probability as a decimal and percentage.
Decimal probability
0.16666667
Probability
16.66666667%
Complementary probability
83.33333333%
Information
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Local processing
The calculations are done in your browser without sending the values to a server.
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Free
No registration, subscription, or paid API required.
Frequently asked questions
What's the formula?
Probability = favorable outcomes ÷ possible outcomes.
Can there be more favourable cases than possible?
No. In a simple probability calculation, favorable outcomes cannot exceed the total number of possible outcomes.
Does it show the complementary probability?
Yes.
Is it for complex odds?
No. This tool calculates simple probabilities with equally likely outcomes.