Odds to Probability Calculator
Convert odds (for : against) into a probability percentage.
Result
Probability (%)
20.00
Probability
0.2000
How it works
P = for ÷ (for + against)
Odds compare the chance of an event to the chance against it. Odds of 1:4 mean one favourable for every four unfavourable — a 20% probability.
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Frequently asked questions
What do odds of 1:4 mean?
One chance for, four against — a probability of 1/(1+4) = 20%.
Odds vs probability?
Odds compare for-to-against; probability is the share of the total, between 0 and 1.
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