Everyday
Odds to Probability Calculator
Convert favorable-to-unfavorable odds into an implied probability percentage.
- Free to use
- Runs in your browser
- Level A · Standard formula
- Last reviewed 2026-08-16
Calculator guide
How to use the Odds to Probability Calculator
Convert favorable-to-unfavorable odds into an implied probability percentage. Enter the requested values and select Calculate. The result and supporting values are produced locally in your browser.
Formula
Worked example
Odds of 3:2 correspond to an implied probability of 60%.
What to keep in mind
- This calculator interprets inputs as favorable-to-unfavorable odds.
- Quoted betting odds can include bookmaker margin and may use different formats.
Methodology
This calculator uses deterministic arithmetic and performs the calculation locally in your browser. Verify assumptions, units, and source values for your specific use case.
Review standard: Level A · Standard formula. How calculator reviews work.
Frequently asked questions
What does this calculator calculate?
Convert favorable-to-unfavorable odds into an implied probability percentage.
How is the result calculated?
Probability = Favorable Odds ÷ (Favorable Odds + Unfavorable Odds) × 100.
Can I use the result for an important decision?
Use the result as a calculation aid and verify the inputs, assumptions, and applicable professional or regulatory requirements before relying on it for an important decision.
Does CalculateMeasure store the values I enter?
The calculator performs its arithmetic in your browser. The calculator itself does not need to send your entered values to a server to produce the result.