Free betting calculator
No-Vig Calculator
Enter the odds for both sides of a two-way market to remove the sportsbook's margin and see the fair odds and probability for each side.
American odds, e.g. +150 or -110
The other side of the same market
Fair odds
Vig removed: 3.48%
Side A
−138
- Decimal
- 1.725
- Fair probability
- 57.98%vs 60.0%
Side B
+138
- Decimal
- 2.380
- Fair probability
- 42.02%vs 43.5%
How it works
A sportsbook prices both sides so their implied probabilities add up to more than 100%. The excess is the vig, the book's built-in margin.
Scaling each side's implied probability down so the pair sums to exactly 100% gives the market's fair view. Sharp-book no-vig odds are the benchmark for spotting +EV prices elsewhere.
pA = 1 / decimalA pB = 1 / decimalB
fair pA = pA / (pA + pB)
fair decimal A = 1 / fair pA
vig = pA + pB − 1
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