Probability Calculator
Result
Calculated result
0.25
Based on the values entered.
↗ Math
Probability Calculator — free online calculator.
Formula
P(A) = Favorable Outcomes ÷ Total Outcomes
- Probability Calculator calculates its result from Favorable Outcomes, Total Outcomes. It uses the formula P(A) = Favorable Outcomes ÷ Total Outcomes. Change any input to recalculate the result instantly.
- The main inputs are Favorable Outcomes, Total Outcomes. Enter them in the units and format shown in the calculator.
- Keep comparable quantities in compatible units whenever the formula combines or compares them.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Probability
Inputs
- Favorable Outcomes: 5
- Total Outcomes: 20
Using Favorable Outcomes = 5, Total Outcomes = 20, the calculated result is 0.25.
Sample result: Calculating…
Frequently asked questions
What does the Probability calculate?
Probability Calculator — free online calculator.
Which values should I enter?
Enter Favorable Outcomes, Total Outcomes using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: P(A) = Favorable Outcomes ÷ Total Outcomes.
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.