Odds to Probability Calculator
Convert positive odds ratio a:b to implied probability a ÷ (a+b).
A QUICK WALKTHROUGH
How to use this tool
- Enter positive values a and b for favorable and unfavorable outcomes.
- Review the ratio a:b and the formula a ÷ (a+b).
- Calculate the implied probability locally.
Formula and limits
This accepts odds in favor to against as a:b, not decimal/fractional/American betting odds. It reports implied probability only.
Scope
This is a bounded arithmetic aid, not a measurement, diagnosis, engineering design, or recommendation. Verify source values, units, and assumptions independently.
Privacy
Inputs are processed in this browser and are not uploaded or stored.
GOOD TO KNOW
Common questions
Does this make a decision for me?
No. It only evaluates the stated formula using your inputs.