Rex says
The fast lane for the math you almost remember from school. Type the numbers, get the answer, move on with your day.
Try a scenario
Click to load — tweak from there.Inputs
Result
Fair odds — Side A
100
Fair odds — Side B
100
Fair probability — Side A
50.0%
Fair probability — Side B
50.0%
Book hold removed
4.76%
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter side a odds (american).
- 2Enter side b odds (american).
- 3Read your fair odds — side a on the right — it updates as you type.
- 4Hit Share to keep the scenario or send it to someone.
About this calculator
Posted odds always include the book's built-in margin. A no-vig calculation removes that margin proportionally from both sides of a market so you can see what the odds would be if the book took zero cut — the 'fair' or 'true' price implied by where the market has set the line. This is the standard method sharp bettors and modelers use to build power ratings from market prices instead of trusting a single book's number outright. It's also the basis for finding closing line value: comparing your bet price against the no-vig closing number tells you whether you beat the market, independent of whether the individual bet won or lost. Enter both sides of a two-way market (moneyline, spread, or total) in American odds. The calculator normalizes the implied probabilities to sum to exactly 100%, then converts those fair probabilities back into odds. This method works cleanly for two-outcome markets; three-way markets (soccer moneylines with a draw) need a slightly different multi-way normalization not covered here.
Worked example
Using the values the calculator loads with:
Inputs
- Side A odds (American): -110
- Side B odds (American): -110
Results
- Fair odds — Side A: 100
- Fair odds — Side B: 100
- Fair probability — Side A: 50.0%
- Fair probability — Side B: 50.0%
- Book hold removed: 4.76%
What each field means
Inputs
- Side A odds (American)
- The side a odds (american) used in the calculation. Starts at -110 so you have a working example on load.
- Side B odds (American)
- The side b odds (american) used in the calculation. Starts at -110 so you have a working example on load.
Results
- Fair odds — Side A
- Returned as a whole number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Fair odds — Side B
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Fair probability — Side A
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Fair probability — Side B
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Book hold removed
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What is 'hold' and how much is normal?
Hold is the percentage of total handle the book expects to keep regardless of outcome, on a two-way market. Standard -110/-110 lines hold about 4.5%. Reduced-juice books offer -105/-105 (about 2.4% hold). Lopsided lines on heavy favorites, like -400/+320, often carry higher hold, sometimes 6-8%.
Why do I need no-vig odds instead of just using the raw line?
Raw odds overstate both outcomes' probability because the vig is baked into each side. If you're building a model or checking whether you got a good price relative to the market, you need the vig removed first, otherwise you're comparing your estimate against an inflated number and will underestimate your real edge or lack of it.
Does this work for three-way markets like soccer with a draw?
Not directly with this simple proportional method — three-way markets need multiplicative or Shin's method normalization to handle the draw correctly, since proportional vig removal on three outcomes can distort longshot prices. This calculator is built for two-way markets: standard US spreads, totals, and moneylines without a draw.
Accuracy and limitations
- Results are rounded for display; the underlying calculation keeps full precision.
- Very large or very small inputs may hit floating-point limits in the browser.
- Inputs outside the accepted range are clamped rather than rejected.
Related tools
Implied Probability Calculator
See the win probability a betting line is actually pricing in.
Closing Line Value (CLV) Calculator
Measure whether you beat the market's final price, independent of the result.
Sportsbook Hold Percentage Calculator
Calculate the vig/hold a sportsbook is baking into any two-way market.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). No-Vig Fair Odds Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/no-vig-fair-odds
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/no-vig-fair-odds" target="_blank" rel="noopener">No-Vig Fair Odds Calculator — RevenueLab</a> (2026).</p>
Source: [No-Vig Fair Odds Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/no-vig-fair-odds) (2026).