Free calculator
No-Vig Fair Odds Calculator
American1.667 decimal
American2.300 decimal
Divides each side's implied probability by the total. The usual default.
Price at another book (optional)
The same outcome at a different book, to see what it is worth against these fair odds.
American, decimal, fractional or a percent: -110, 2.50, 10/11, 52%
| Outcome | Offered | Fair % | Fair American | Fair decimal |
|---|---|---|---|---|
| Side A | -150 | 57.98% | -138 | 1.725 |
| Side B | +130 | 42.02% | +138 | 2.380 |
Fair odds: Side A 58.0% (-138), Side B 42.0% (+138). The book holds 3.36%.
How to use it
- Enter both prices of one market from the same book, in any format.
- For a soccer match result or any other three-way market, add the draw.
- Pick a method; proportional is the usual default.
- Optionally enter a price from another book to see its expected value against the fair odds.
The formula
Turn every price into its implied probability, measure how far they overshoot 100%, and scale them back.
implied = 1 / decimal, for each outcome vig (overround) = sum of implied - 1 hold = 1 - 1 / sum of implied fair probability (proportional) = implied / sum of implied fair decimal = 1 / fair probability
-150 / +130: the prices imply 60.0% and 43.5%, 103.5% together. The vig is 3.5% and the hold 3.4%. Proportionally, the fair chances are 58.0% (-138) and 42.0% (+138). The power method gives 58.4% and 41.6%, the additive 58.3% and 41.7%.
- Proportional. Divides each side's implied probability by the total. The usual default.
- Power. Raises every implied probability to one power so they sum to 1, which takes more of the margin from the longer price.
- Additive. Takes the same share of the margin off every side.
Edge cases
- Use one book's prices for both sides. Prices from two books can add up to under 100%, which is not a margin to remove; the calculator flags it.
- The methods agree on an even market: -110 / -110 is 50.0% each by all three. They differ most on long prices.
- Three-way markets usually carry more margin than two-way ones, and the draw soaks up part of it; the table below shows the closing hold of each.
- A market with only one price listed cannot be devigged: the other side is what tells you the margin.
From the odds Agatha tracks
What the books keep: closing hold
Median hold at the close over the last 30 days (since August 28, 2026), across 70,020 two-way moneyline markets.
The typical two-way moneyline closed with 4.88% of hold. The typical three-way moneyline closed with 6.70%. Book by book, it ran from 2.07% at 1xBet to 7.23% at PMU.
By league
| League | Market | Median hold | Markets |
|---|---|---|---|
| NFL | Two-way moneyline | 4.50% | 2,239 |
| MLB | Two-way moneyline | 4.51% | 25,737 |
| NHL | Two-way moneyline | 4.58% | 466 |
| CFL | Two-way moneyline | 4.61% | 695 |
| WNBA | Two-way moneyline | 4.74% | 1,807 |
| NCAAF | Two-way moneyline | 4.83% | 10,544 |
| UFC | Two-way moneyline | 4.91% | 2,261 |
| ATP | Two-way moneyline | 5.11% | 8,907 |
| WTA | Two-way moneyline | 5.30% | 15,090 |
| Esports | Two-way moneyline | 6.94% | 2,274 |
| La Liga | Three-way moneyline | 5.26% | 132 |
| Serie A | Three-way moneyline | 6.06% | 110 |
| MLS | Three-way moneyline | 6.82% | 3,550 |
| CFL | Spread | 4.55% | 546 |
| NFL | Spread | 4.55% | 1,775 |
| WNBA | Spread | 4.55% | 1,290 |
| MLB | Spread | 4.65% | 18,214 |
| NCAAF | Spread | 4.75% | 10,678 |
| MLS | Spread | 5.20% | 726 |
| La Liga | Spread | 5.54% | 107 |
| NHL | Spread | 6.17% | 347 |
| UFC | Spread | 6.37% | 131 |
| Esports | Spread | 7.61% | 306 |
| CFL | Total | 4.55% | 540 |
| NCAAF | Total | 4.55% | 10,192 |
| NFL | Total | 4.55% | 1,711 |
| WNBA | Total | 4.71% | 1,370 |
| MLB | Total | 4.74% | 18,329 |
| Serie A | Total | 5.35% | 100 |
| La Liga | Total | 5.37% | 120 |
| UFC | Total | 5.68% | 801 |
| NHL | Total | 6.07% | 327 |
| MLS | Total | 6.12% | 1,795 |
| Esports | Total | 7.62% | 520 |
By sportsbook, two-way moneylines
| Sportsbook | Median hold | Markets |
|---|---|---|
| 1xBet | 2.07% | 724 |
| Pinnacle | 2.56% | 1,084 |
| BetOnline | 3.28% | 1,055 |
| BetUS | 3.41% | 855 |
| FanDuel | 4.04% | 1,132 |
| Caesars | 4.11% | 1,049 |
| Unibet | 4.16% | 1,164 |
| Bovada | 4.28% | 1,074 |
| DraftKings | 4.35% | 1,106 |
| Fanatics | 4.36% | 1,036 |
| BetMGM | 4.43% | 1,116 |
| Hard Rock | 4.49% | 1,108 |
| Betfair | 4.55% | 591 |
| Betway | 4.61% | 1,050 |
| MyBookie | 4.63% | 964 |
| Casumo | 4.74% | 696 |
| BetRivers | 4.85% | 1,073 |
| Sportsbet | 4.90% | 1,098 |
| Ladbrokes | 5.03% | 1,135 |
| Cloudbet | 5.03% | 444 |
| Betfred | 5.04% | 808 |
| Coral | 5.08% | 880 |
| Superbet | 5.09% | 277 |
| Betsson | 5.16% | 1,097 |
| 888sport | 5.17% | 812 |
| Sky Bet | 5.26% | 341 |
| William Hill | 5.26% | 862 |
| BoyleSports | 5.31% | 778 |
| bet365 | 5.61% | 714 |
| LiveScore Bet | 5.68% | 757 |
| Tipico | 5.84% | 705 |
| Winamax | 6.10% | 726 |
| Rollbit | 6.26% | 630 |
| Paddy Power | 6.38% | 831 |
| Betano | 6.46% | 1,075 |
| Stake | 6.68% | 653 |
| BetVictor | 6.72% | 815 |
| Roobet | 7.04% | 629 |
| PMU | 7.23% | 386 |
As of . The sportsbooks Agatha tracks
No-vig calculator questions
What does no-vig mean?
No-vig odds are a market's prices with the book's margin taken out, so the chances add up to exactly 100%. -150 / +130 becomes -138 / +138.
What is the difference between vig and hold?
Both measure the margin. The vig (overround) is how far the implied probabilities add up past 100%: 3.5% in the example. The hold is the share of all the money bet that a balanced book keeps: 3.4%. Hold is always the smaller number.
Which devig method should I use?
Proportional is the common default and the easiest to check by hand. Power takes more of the margin from the longer price, a common adjustment for the long-standing finding that longshots are overpriced. On a close market the three barely differ.
Why would two prices add up to less than 100%?
Because they did not come from one market at one moment. One price is stale, or the two come from different books. Either way there is no margin to remove, and a gap that looks like value usually closes before it can be bet.
What can I do with fair odds?
Compare them with a price elsewhere: a price longer than fair is worth more than it costs. They are also how closing line value is measured without the vig; the CLV calculator does that for a bet you placed.