Probability Calculator

Free Probability Calculator — calculate and compare options instantly. No signup required.

Favorable Outcomes

Total Outcomes

Number of Events

Probability (decimal)

Probability (fraction)

1/6

Probability (%)

16.7%

Odds For

1:5

Odds Against

5:1

P(at least once in 1 events)

16.7%

How to Use the Probability Calculator

1. Enter your values — fill in the input fields with your numbers.
2. Adjust settings — use the sliders and selectors to customize your calculation.
3. View results instantly — calculations update in real-time as you change inputs.
4. Compare scenarios — adjust values to see how changes affect your results.
5. Share or print — copy the link, share results, or print for your records.

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