Free tool
No-Vig / Fair Odds Calculator
Strip the bookmaker margin from a two-way market to reveal the true probabilities and fair odds.
Bookmakers build a margin (the "vig" or overround) into their odds, so the implied probabilities of all outcomes add up to more than 100%. Removing that margin proportionally gives the no-vig fair odds — the prices reflecting the bookmaker's true opinion. Compare them to what you can get elsewhere: beat the fair odds and you have a value bet.
Fair (no-vig) line
- Bookmaker margin
- 4.71%
- Fair probability A
- 50.00%
- Fair probability B
- 50.00%
- Fair odds A
- 2.000
- Fair odds B
- 2.000
How it works
A no-vig calculator removes the bookmaker's built-in margin — known as the vig, juice or overround — from a two-way market to reveal the fair odds and fair probabilities. Bookmakers price both sides so that the implied probabilities add up to more than 100%; that surplus is their margin, and it is the reason the headline price always understates the true chance. The tool takes the two opposing decimal prices, adds their implied probabilities to measure the overround, then scales each side back down so the two fair probabilities sum to exactly 100%. The result is the bookmaker's own honest opinion of each outcome's chance, stripped of the charge baked in for the house. Bettors use no-vig prices as a benchmark. By comparing the fair odds against the actual price on offer — at the same or a different bookmaker — you can judge whether a bet carries genuine value and estimate the real probability of an outcome more accurately than the raw odds allow. The same method extends to three-way (1X2) markets such as football, where home, draw and away are each priced separately: switch the calculator to three-way mode, enter all three prices, and it sums the three implied probabilities and scales them back to 100% for the fair, no-vig line across every outcome.
Worked example
Suppose a market is priced at 1.90 on each side of a two-way bet. Implied probability of each side: 1 / 1.90 = 0.5263 = 52.63% Book total (overround): 52.63% + 52.63% = 105.26% The 5.26 percentage points above 100% is the bookmaker's margin. Remove the vig by scaling each side to sum to 100%: Fair probability of each side: 52.63% / 105.26% = 50.0% Fair odds: 1 / 0.50 = 2.00 on each side So two 1.90 prices reflect a fair 50/50 contest worth 2.00 a side. The gap between 2.00 (fair) and 1.90 (offered) is exactly what the bookmaker keeps.
No-vig odds are an estimate of fair value, not a guarantee — they assume the bookmaker has priced the two sides correctly and simply distribute the margin evenly, which is not always how it is applied. Use them to compare prices and spot value, but remember they reflect the market's opinion rather than the true outcome.
Frequently asked questions
What is vig (or overround) in betting?
Vig, juice or overround is the bookmaker's margin — the amount by which the implied probabilities of a market add up to more than 100%. Two 1.90 prices total 105.26%, so the vig is 5.26 percentage points.
How do you remove the vig from odds?
Add the implied probabilities of both sides, then divide each side's probability by that total so the two figures sum to 100%. Converting those fair probabilities back to odds gives the no-vig prices.
Why are no-vig odds useful?
They show the bookmaker's true assessment of each outcome without the margin, which makes them a fair benchmark. Comparing the no-vig price against the price you can actually back reveals whether a bet offers value.
Are no-vig odds the real probability of an outcome?
They are the market's best estimate, not a certainty. The method assumes the bookmaker priced both sides accurately and spreads the margin evenly, so treat the result as a well-informed approximation.
How do I calculate the vig by hand?
Convert each price to its implied probability (1 / decimal odds), add them up, and subtract 100%. For two prices of 1.90 that is 52.63% + 52.63% = 105.26%, so the vig is 5.26 percentage points. The calculator does this instantly and also returns the fair no-vig odds.
Can this work as a 3-way (1X2) vig calculator?
Yes. Switch to three-way mode for football-style home/draw/away markets. Enter all three decimal prices and it sums the three implied probabilities, measures the overround, and scales each back to 100% to give the fair, no-vig price for every outcome — the same de-vig maths as a two-way market, applied across three.
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