No-Vig (No-Juice) Calculator
Strip the bookmaker margin from any 2-way market and see what the fair price should be. The single math trick that turns soft-book line shopping into +EV value betting.
What is "vig"?
The vig (also called juice or overround) is the bookmaker's built-in margin. In a fair coin-flip market, both sides should be priced at exactly 2.00 — implied probability 50% each, summing to 100%. Bookmakers shift both prices down (e.g. 1.91 / 1.91) so the implied probabilities sum to 104.7%. That extra 4.7% is the vig — your long-run expected loss if you bet randomly.
The no-vig formula
The two fair probabilities sum to exactly 100%. Multiply your implied probability by overround to recover the bookmaker's price — divide to recover the fair price.
Why no-vig odds matter for value betting
The professional approach to value betting:
- Use a sharp market (Pinnacle, Matchbook, Smarkets) to get the no-vig fair price for both sides.
- Compare to a soft book — if a recreational book is offering better than the sharp's fair price, you have +EV.
- Compute EV:
EV = (your_decimal_odds / sharp_fair_decimal_odds) − 1, expressed in % — this is the long-run profit per unit.
Example: Pinnacle has 1.91/1.91 on a tennis match. The fair no-vig price is exactly 2.00 each side. If FanDuel offers 2.05 on Side A, your edge = (2.05 / 2.00) − 1 = +2.5% EV. Repeat 1000 times, you make 25 units after vig.
Typical vig on tennis markets
| Bookmaker tier | ATP/WTA matches | Challenger / ITF |
|---|---|---|
| Pinnacle (sharp) | 2–4% | 3–5% |
| Matchbook / Smarkets (exchange) | 1–3% | 2–4% |
| Major regulated books (Bet365, William Hill, FanDuel) | 5–7% | 7–10% |
| US offshore books | 6–10% | 10–15% |
| Live in-play markets | 5–9% | 10–18% |
Higher vig = wider gap between the bookmaker's price and the true probability. That's where +EV opportunities live — but only if you have an honest model or sharp benchmark to compare against.
Limitations of no-vig
No-vig is an estimate, not truth. The bookmaker doesn't always split the vig 50/50. Sharp books often weight the vig toward the favourite (so favourites are priced harder relative to fair). For 3-way markets (e.g. with a tie option), use a 3-way no-vig calculation. And no-vig at a soft book is meaningless — you need a sharp market for the benchmark.
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What does "no-vig" mean?
Odds with the bookmaker's margin (the vig) stripped out, so implied probabilities sum to exactly 100% instead of more. An estimate of the true fair price.
How do I calculate no-vig odds?
1) Implied prob = 1/odds for each side. 2) Sum them — that's the overround. 3) Divide each implied prob by overround. 4) Fair odds = 1 / no-vig prob.
What is a normal vig in tennis betting?
Sharp books (Pinnacle): 2–4%. Recreational books: 5–7%. Live in-play and small markets: 8–15%. Higher vig means more soft pricing — bigger +EV opportunities for sharp bettors.
Is no-vig the same as the true probability?
It's an estimate of true probability — usually the closest cheap signal you'll get without your own model. Sharp books like Pinnacle weight the vig somewhat toward favourites, so no-vig is an approximation, not truth.
Can I use this for 3-way markets like correct sets?
This calculator is 2-way only. For 3-way markets, sum all three implied probabilities to get the overround and divide each by it — same principle, three sides instead of two.