How it works
Implied probability = denominator / (numerator + denominator) × 100. Fractional odds describe net winnings relative to stake.
Input definitions
- Fractional odds numerator
- Enter the value in the labeled unit.
- Fractional odds denominator
- Enter the value in the labeled unit.
A worked example
- Fractional odds numerator
- 3
- Fractional odds denominator
- 1
Assumptions & limits
Uses the units and scope stated in the input labels. Results are rounded for display; verify the model is appropriate for your situation.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-18. Content checked against the stated method and examples. Our verification approach.
Common questions
Does the implied probability predict the outcome?
No. It is the probability implied by the quoted odds before bookmaker margin adjustments; it does not establish the true chance of success.
How does Fractional odds implied probability work?
Implied probability = denominator / (numerator + denominator) × 100. Fractional odds describe net winnings relative to stake.
What should I check before using Fractional odds implied probability?
Uses the units and scope stated in the input labels. Results are rounded for display; verify the model is appropriate for your situation.