Side 1
- Book odds
- −110
- Break-even win rate
- 52.38%
- Fair American
- +100
- Fair decimal
- 2.000
- No-vig probability
- 50.00%
Vig Calculator: Juice, Hold and No-Vig Fair Odds
A sportsbook's prices tell you what you need to win to break even, but they also include a margin. Enter every outcome to see the vig, theoretical hold and no-vig fair odds. You can mix American, decimal and fractional prices. The calculator is free, and you don't need an account.
Enter the odds from your sportsbook
Type in the price for every side of the bet, exactly as your book shows it. If you're checking for an arbitrage, use the best price you can find for each side, even if they're from different books.
Unsigned prices from 1.01 to under 100 are decimal; 100 or more is American, even if typed with a decimal point.
Example: -110, 1.91 or 10/11
Example: -110, 1.91 or 10/11
Vig (overround)
4.76%
Theoretical hold: 4.55%
Total implied probability: 104.76%
Side 1: 52.4%Side 2: 52.4%
These prices imply 104.76% in total. The 4.76 percentage points above 100% are the vig (overround).
What the odds would look like with no vig
Proportional normalization removes the margin to give a market reference, not a prediction of the result.
Side 2
- Book odds
- −110
- Break-even win rate
- 52.38%
- Fair American
- +100
- Fair decimal
- 2.000
- No-vig probability
- 50.00%
We remove the vig by scaling each side's implied chance down proportionally until they add up to 100%. Keep in mind these are the market's best guess, not a guarantee of what will happen.
How to calculate vig (worked example)
Convert each price to implied probability, add the probabilities, then subtract 100% to get vig (overround).
Side 1: -110 → 110 ÷ 210 = 52.38% implied
Side 2: -110 → 110 ÷ 210 = 52.38% implied
Total: 52.38% + 52.38% = 104.76%
Vig (overround): 104.76% − 100% = 4.76%
Theoretical hold: (1 − 1 ÷ 1.047619) × 100 = 4.55%
No-vig: 52.38% ÷ 104.76% = 50.00%, or +100 per side.
Uneven prices work the same way: -130 implies 56.52% and +110 implies 47.62%. Their 104.14% total means 4.14% vig and 3.98% theoretical hold. Divide each implied rate by 104.14% and the fair prices round to -119 and +119.
Implied probability formulas
Negative American: |A| / (|A| + 100). Positive American: 100 / (A + 100). Decimal: 1 / D. Fractional a/b: b / (a + b).
Vig = (sum of implied probabilities − 1) × 100. Theoretical hold = (1 − 1 / sum) × 100.
Vig calculator for decimal odds
Divide 1 by each decimal price. At 1.91 and 1.91, the two break-even rates add up to 104.71%, or 4.71% vig. At 1.80 and 2.10, the total is 103.17%: 3.17% vig, with proportional fair decimal prices of 1.857 and 2.167. You can also enter fractions such as 10/11 on each side; that pair has 4.76% vig.
3-way markets
Include the draw when a market has home, draw and away outcomes. At +150, +240 and +190, implied probabilities total 103.89% (3.89% vig); fair prices round to about +160, +253 and +201. For markets with four to eight outcomes, choose More and add a field for each outcome. Leave none out.
Vig vs hold vs no-vig (de-vig) odds
Vig is the percentage points above 100% when you add up every side's break-even rate. Theoretical hold is the share of equalized payouts left at those prices: 4.55% rather than 4.76% for -110/-110. Neither figure guarantees what a book will earn. No-vig odds divide each implied probability by the total, then convert the adjusted probabilities back into prices.
What vig costs you over a season
At -110, you need to win 52.38% of bets just to break even. On a balanced two-way market, moving both sides from -110 to -105 reduces vig from 4.76% to 2.44%. That difference matters when you place bets week after week. Compare the price, not just the pick.
How much vig to expect
These are rough starting points. Check the full set of live prices for the actual market.
| Market | Common pricing | Typical vig |
|---|---|---|
| Spreads / totals | −110 / −110 | 4.5–5% |
| Moneylines | Varies | 3–6% |
| Player props | Often −115 / −115 | 5–12% |
| Futures | Many outcomes | 10–30%+ |
What the no-vig price doesn't tell you
Removing the margin gives you a market reference, not an objective probability. Books can disagree, and proportional de-vig is one of several methods. Compare your research with the available price, and check the track record before treating any prediction as proven.
When prices add up to under 100%
The best price for every outcome across different books can sometimes total less than 100%. That may be an arbitrage, but the calculated stake split and return assume every offer is still live, all outcomes cover the same market and every book settles it the same way. Limits, fees and voided bets can change the result.
Frequently asked questions
What is vig in sports betting?
Vig, or juice, is the margin built into the prices of a complete betting market. Add each outcome's implied probability and subtract 100 percentage points to find the vig (overround).
How much vig is in -110 on both sides?
Each -110 price implies a 52.38% break-even win rate. Together they total 104.76%, so the vig is 4.76% and the theoretical hold is 4.55%. The proportional no-vig prices are +100 on both sides.
Is vig the same as a sportsbook's hold?
No. Vig is how far the implied probabilities exceed 100%. Theoretical hold is 1 minus 1 divided by their sum. Actual sportsbook hold depends on the bets accepted and how they settle.
How do I calculate no-vig odds?
Divide each outcome's implied probability by the sum for the whole market, then convert those normalized probabilities back to odds. This proportional method makes the adjusted probabilities total 100%.
Can I enter fractional or mixed odds formats?
Yes. Enter American odds such as -110 or +150, decimal odds such as 1.91, or fractional odds such as 10/11 in any field. The American/Decimal toggle changes how you view fair odds, not how inputs are read.
What if the prices add up to less than 100%?
That can indicate a possible arbitrage if every price is live and refers to a different outcome of the same market under the same settlement rules. The stake split and return are theoretical; limits, voids and stale prices matter.
Are no-vig odds the true chance of winning?
No. No-vig odds are a market-based reference after removing margin by one method. They do not prove an outcome's actual probability or that a particular bet is good value.