Probability Calculator
Quick answer: Enter favorable outcomes and total outcomes to calculate probability, percentage, and odds.
Calculate the probability of any event from the number of favorable outcomes and total outcomes. Get the result as a decimal, percentage, and odds ratio.
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Last reviewed: April 2026Report an error
Probability
0.1667
Probability: 0.1667 (16.67%). Odds: 1:5.
Probability
0.1667
Percentage
16.67%
Odds
1:5
Complement
83.33%
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How to Use This Probability Calculator
- 1Enter the number of favorable outcomes.
- 2Enter the total number of possible outcomes.
- 3Read the probability, percentage, odds, and complement.
Frequently Asked Questions
- P(event) = favorable outcomes ÷ total outcomes. Example: probability of rolling a 3 on a die = 1/6 ≈ 16.67%.
- The complement is the probability the event does NOT occur: P(not A) = 1 - P(A). If there's a 30% chance of rain, there's a 70% chance of no rain.
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