Measure bookmaker juice on any 2-way line—vig % and fair no-vig prices in seconds
Vig (vigorish), juice, or the bookmaker margin is the built-in commission on every two-way market. When you convert both prices to implied probabilities and add them, the total exceeds 100%—that excess is the vig.
This free vig calculator shows the exact margin percentage and the fair no-vig odds for each side, so you can compare sportsbooks, spot soft lines, and size value bets.
Need 3-way soccer (1X2) or 4-way markets? Use our no-vig calculator for multi-outcome de-vigging.
Results update as you type—no need to click Refresh unless you want to recalculate after a paste.
You know the vig—now test whether your edge beats the fair line. Open the expected value calculator with your no-vig baseline, or strip margin on 3-way soccer markets.
Enter both sides of a two-way market (moneyline, spread, or total). The tool accepts your preferred odds format from site settings.
This calculator shows:
Note: Lower vig means better long-term prices. Most US spreads sit near 4–5% vig at -110/-110; props and futures often run 6%+ unless you have a strong edge.
For decimal odds O₁ and O₂ on a two-way market, implied probabilities are p₁ = 1/O₁ and p₂ = 1/O₂. The overround (vig) is (p₁ + p₂ − 1) × 100%. Fair (no-vig) probability for side i is p̂ᵢ = pᵢ / (p₁ + p₂), and fair decimal odds are 1/p̂ᵢ.
Lower vig means better prices for bettors. Standard NFL/NBA spreads at -110/-110 carry about 4.72% vig; reduced-juice books at -105/-105 drop near 2.38%. Always compare vig before assuming a line is sharp.
For decimal odds \(O_1, O_2\) on a two-way market:
Vig % = \(\bigl(\frac{1}{O_1}+\frac{1}{O_2}-1\bigr)\times 100\). Fair probs: \(\hat p_i = \frac{1/O_i}{1/O_1+1/O_2}\).
Scenario: Both sides at -110 (decimal 1.91 each). Enter those prices in the calculator above.
| Metric | Value | Note |
|---|---|---|
| Implied prob each side | 52.36% each | 1/1.91 per side |
| Vig (overround) | 4.72% | Typical US spread juice |
| Fair no-vig price | +100 (2.00 decimal) | True 50/50 baseline |
Each -110 implies 52.36% → total 104.72% → 4.72% vig. Fair odds: +100 (decimal 2.00) each side. If one book shows -105 and another -110, the -105 book has lower vig.
Favorite -150 (decimal 1.67) vs underdog +130 (decimal 2.30). Implied: 60% + 43.48% = 103.48% → 3.48% vig. Fair no-vig: ~58.0% / 42.0% → fair decimal 1.72 / 2.38 (American roughly -138 / +138).
At -110/-110 (~4.72% vig), you must win ~52.4% of bets to break even. At -105/-105 (~2.38% vig), break-even drops to ~51.2%—about 1.2 percentage points easier over thousands of bets.
| Line | Vig | Break-even win rate |
|---|---|---|
| -110 / -110 | ~4.72% | 52.4% |
| -105 / -105 | ~2.38% | 51.2% |
Field notes from line shoppers—not a textbook. If you bet volume, juice is often the leak before your handicapping is.
Pinnacle isn't a magic ATM—you can't always bet there—but their main markets often run near ~2% vig while retail books sit at 4.5–5%+ on the same game. Sharps use Pinnacle (and similar low-margin books) as a price benchmark: if your book's implied total is 104.7% and Pinnacle's is 102.1%, you're paying a tax on every wager. Log both before you decide a side is +EV.
Books that hang -105/-105 instead of -110/-110 aren't just a welcome promo—they move break-even from ~52.4% to ~51.2%. Over 1,000 wagers at similar stakes, that's roughly 12 extra wins you don't need to find with handicapping. Reduced-juice sportsbooks give bettors a significantly lower break-even threshold over thousands of wagers.
A common mistake: you beat the closing number but still lose for the year. Check vig at bet time and at close. A -108 opener that closes -115 can mean you had CLV on price movement but paid 4.5% juice at entry while the market settled near 2.5%. The vig calculator is where you catch that gap.
A +350 ML dog at Book A and a -110 spread at Book B tell you nothing together. Compare vig on the same market (spread vs spread, total vs total). Props and alt lines often run 6–8%+—that's where recreational books make margin even when main lines look competitive.
If vig is above 6% unless you have a large model edge, you're usually donating to the book's prop/derivative margin. Sharps pass—or bet smaller—until they find a main-market price within ~1% of their benchmark book's no-vig line.
Vig (overround) measures how much implied probability exceeds 100% on a posted market. Hold is the sportsbook's expected profit if action balances—related but not identical. Use our hold calculator when you want hold % on the same prices.
Parlays compound juice: each leg includes vig, so the combined overround is much higher than a single-game spread. Check vig on each leg with this tool before building parlays—our parlay calculator shows combined payout separately.
Line shopping starts with vig: the same game can show 4.7% juice at one book and 2.4% at another. After you know fair no-vig odds, compare your model to p̂ᵢ—if you project 54% but fair price is 50%, the posted line may offer edge (confirm with EV math).
Strip margin on 3- or 4-way markets with our no-vig calculator (soccer 1X2, golf, etc.).
Convert any format to implied % with the implied probability calculator before comparing models.
Check expected book profit with the hold calculator, then confirm +EV via the expected value calculator.
Vig tells you how expensive a market is—not who will win. Shop lower juice, use fair odds as your baseline, and combine with bankroll discipline. Betting is entertainment for adults 18+ only; never chase losses.
18+ only. Gambling involves risk of loss. Set deposit and time limits, never bet money you cannot afford to lose, and take breaks if betting stops being fun.
Help: BeGambleAware, NCPG (US).
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