No-Vig Calculator — True Fair Odds Without the Juice

Enter the American odds for both sides of your market — Side A and Side B — then click Find Fair Odds. For three-outcome markets like soccer (home / draw / away), also fill in the Side C field. The calculator shows:

• The total bookmaker margin (vig %) and overround
• The implied probability for each side as posted by the book
• The no-vig (fair) probability for each side after removing the margin
• The fair American odds for each outcome

Two-way markets (NFL spreads, NBA totals, tennis moneylines) use only Side A and Side B. Leave Side C blank. Fields default to -110 / -110, the standard US point-spread price.

Three-way markets(soccer 1X2, some hockey games where overtime odds are separate) require all three sides. Enter the odds for Home Win, Away Win, and Draw — each as American odds. The calculator removes the book's margin across all three and shows the true fair probability and odds for each outcome.

Use the fair odds as a benchmark when line shopping. Any sportsbook offering odds better than the fair odds shown here is offering a positive expected value (+EV) bet on that outcome.

The no-vig method strips the overround out of each side's implied probability so the fair probabilities sum to exactly 100%. The same formula works for 2-way and 3-way markets.

1. Convert each side to implied probability (0–1):
   • Negative odds: prob = |odds| ÷ (|odds| + 100)
   • Positive odds: prob = 100 ÷ (odds + 100)
2. Overround = sum of all implied probabilities
   2-way: Overround = Prob A + Prob B
   3-way: Overround = Prob A + Prob B + Prob C
   (Always > 1.0 when the book charges vig)
3. Vig % = (Overround − 1) ÷ Overround × 100
4. No-vig (fair) probability for each side = Implied Prob ÷ Overround
   The fair probs always sum to exactly 1.0 (100%).
5. Fair decimal odds = 1 ÷ Fair Prob
6. Fair American odds:
   • decimal ≥ 2.0: American = (decimal − 1) × 100 (positive)
   • decimal < 2.0: American = −100 ÷ (decimal − 1) (negative)

The mathematical proof that fair probs sum to 100%: (Prob A + Prob B + …) ÷ Overround = Overround ÷ Overround = 1.0. The overround cancels out, leaving a true probability distribution.

Example 1 — Standard Point Spread (-110 / -110)

The most common line in US sports betting. Both sides are priced at -110.

• Implied Prob A = 110 ÷ 210 = 52.38%
• Implied Prob B = 110 ÷ 210 = 52.38%
• Overround = 1.0476 (104.76%)
• Margin = 4.55%
• Fair Prob A = 52.38% ÷ 1.0476 = 50.00%
• Fair Prob B = 52.38% ÷ 1.0476 = 50.00%
• Fair American odds: +100 / +100 (even money for both sides)

The book is pricing a coin-flip as -110/-110 instead of -100/-100. Every $110 bet costs you an extra $10 compared to the fair price. Over 1,000 -110 bets you need to win 524 times just to break even instead of 500.

Example 2 — Moneyline with Juice (-150 / +130)

A favourite is priced at -150 and the underdog at +130.

• Implied Prob A (-150) = 150 ÷ 250 = 60.00%
• Implied Prob B (+130) = 100 ÷ 230 = 43.48%
• Overround = 1.0348 (103.48%)
• Margin = 3.36%
• Fair Prob A = 60.00% ÷ 1.0348 = 57.98%
• Fair Prob B = 43.48% ÷ 1.0348 = 42.02%
• Fair American odds: approximately -138 / +138

Now line-shop: if another sportsbook offers the underdog at +145, that is better than the fair price of +138 — a genuine +EV opportunity. This is exactly how sharp bettors find edges using consensus lines and no-vig tools.

Example 3 — Soccer 3-Way Market (-130 / +200 / +380)

A Champions League group stage match: Home Win -130, Away Win +200, Draw +380.

• Implied Prob A (-130) = 130 ÷ 230 = 56.52%
• Implied Prob B (+200) = 100 ÷ 300 = 33.33%
• Implied Prob C (+380) = 100 ÷ 480 = 20.83%
• Overround = 56.52% + 33.33% + 20.83% = 110.68% → 1.1068
• Vig ≈ 9.65% — typical for soccer 3-way markets
• Fair Prob A = 56.52% ÷ 1.1068 = 51.06%
• Fair Prob B = 33.33% ÷ 1.1068 = 30.12%
• Fair Prob C = 20.83% ÷ 1.1068 = 18.82%
• Fair odds ≈ -104 / +232 / +431

The book's margin of nearly 10% on this market is much higher than an NFL spread. Any book offering the draw at +450 or better would represent a +EV bet relative to the true fair price of +431.

Using No-Vig Odds for Line Shopping

The no-vig odds represent the consensus market view of the true probability. Open three or four books, enter the sharpest line (usually Pinnacle, Circa, or a betting exchange) into this calculator, then compare the resulting fair odds against the lines offered by soft books like DraftKings or BetMGM. Any line better than the fair odds is worth betting. This strategy — called positive expected value (EV) betting — is the primary edge-finding method used by professional sports bettors worldwide.