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Implied probability & vig calculator
- Side A implied
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- Side B implied
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- Bookmaker margin (vig)
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- Side A no-vig
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- Side B no-vig
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For illustration only. Results are mathematical estimates, not guarantees. Gamble responsibly — 21+.
How to use this calculator
Enter the American odds for both sides of a market. The calculator converts each price to a probability, shows the bookmaker margin (vig) and the fair, no-vig probability of each outcome.
Frequently asked questions
Is this calculator free?
Yes, all our tools are free to use.
Can a calculator help me beat the house?
No. Calculators help you understand value and risk, but the house edge always applies.