Vig Calculator — Remove the Juice & Find No-Vig Fair Odds

A vig calculator — also called a juice calculator or no-vig calculator — is a sports betting tool that measures and removes the sportsbook’s built-in commission from any line. Every market a book offers includes a hidden fee — the vig, also called the vigorish or juice — that guarantees the house a profit margin no matter who wins. A standard -110/-110 NFL spread, for example, doesn’t represent a true 50/50 market — the implied probabilities sum to 104.76%, meaning the sportsbook is charging roughly 4.76% juice.

A vig calculator takes any two-way or three-way line, calculates the total overround (the sum of implied probabilities above 100%), and divides it out to reveal the no-vig fair odds — the price the book would offer if it took no commission. Sports betting bettors use a vig calculator to compare lines across sportsbooks, identify books with the lowest juice, and find +EV bets where one book has mispriced an outcome relative to the no-vig fair price.

The vig is the percentage by which a sportsbook’s implied probabilities exceed 100%. To calculate vig manually, convert every side of a market to implied probability, sum them, and subtract 100%. Below is a worked example using a standard -110/-110 American-odds line.

Step 1 — Convert each side to implied probability. For negative American odds: Implied % = |odds| ÷ (|odds| + 100). For -110: 110 ÷ 210 = 52.38%.

Step 2 — Sum the implied probabilities of every outcome. Both sides at -110 give 52.38% + 52.38% = 104.76%.

Step 3 — Subtract 100% to find the vig. 104.76% − 100% = 4.76%. That’s the juice the sportsbook is charging on the market.

Step 4 — Divide each implied probability by the overround to get the no-vig fair probability. 52.38% ÷ 1.0476 = 50.00% per side — a true coin flip, with the vig stripped out.

Step 5 — Convert the fair probability back into the odds format you prefer. 50.00% → +100 American → 2.00 decimal → 1/1 fractional.

For decimal odds (vig calculator decimal), the math is even cleaner: implied probability = 1 / decimal odds. 1.91 vs 1.91 sums to 104.72% — a 4.72% vig that the calculator removes the same way. The calculator at the top of the page handles every odds format automatically — type any line and the vig, no-vig fair probability, and fair odds appear instantly.

No-vig fair odds — the output of any no-vig fair odds calculator — represent the true price a sportsbook would offer on a market if it charged zero commission. They are the cleanest available estimate of true probability, and they are the baseline sharp bettors compare every wager against.

Formula for no-vig fair odds: fair probability per outcome = implied probability ÷ total overround. Then convert the fair probability back to American, decimal, or fractional odds.

Worked example — a -150 / +130 moneyline: • -150 implied = 150 / 250 = 60.00% • +130 implied = 100 / 230 = 43.48% • Overround = 60.00% + 43.48% = 103.48% (3.48% vig) • Favorite fair = 60.00 / 1.0348 = 57.98% → -138 fair odds • Underdog fair = 43.48 / 1.0348 = 42.02% → +138 fair odds

Why no-vig fair odds matter: if any sportsbook is offering a price better than +138 on the underdog (e.g. +145), you have a positive expected value bet. The no-vig fair number tells you exactly where the +EV line sits. Use the no-vig calculator above on any market, then check the no-vig fair odds against the prices at your book to spot edges.

A 3-way vig calculator strips the sportsbook fee from any market with three possible outcomes — soccer (home win / draw / away win), 3-way moneylines in hockey or basketball that exclude overtime, or any prop market with three settled results. The math is the same as a 2-way vig calculator: you just sum three implied probabilities instead of two.

Formula: convert each side to implied probability, sum them to find the overround, then divide each probability by the overround. The calculator above handles this automatically when you toggle to 3-Way market.

Worked example — soccer match priced at home +180, draw +240, away +160: • Home implied = 100 / (180 + 100) = 35.71% • Draw implied = 100 / (240 + 100) = 29.41% • Away implied = 100 / (160 + 100) = 38.46% • Total overround = 35.71% + 29.41% + 38.46% = 103.58% → 3.58% vig • Fair home = 35.71 / 1.0358 = 34.47% → +190 fair odds • Fair draw = 29.41 / 1.0358 = 28.39% → +252 fair odds • Fair away = 38.46 / 1.0358 = 37.13% → +169 fair odds

If your book is offering any of these three sides at a price better than the fair number above, you have +EV. Use the calculator to test your own three-way markets in seconds.

A vig calculator for decimal odds uses the same logic as American odds — only the input format changes. The fair probability of each outcome is its raw implied probability divided by the total implied probability across all outcomes.

Decimal-format formula: fair probability = (1 / decimalOdds) ÷ sum of (1 / decimalOdds) across all outcomes. Then convert back: fair decimal odds = 1 / fair probability.

Worked example — a tennis match priced at 1.91 vs 1.91 (the decimal equivalent of -110/-110): • Player A implied = 1 / 1.91 = 52.36% • Player B implied = 1 / 1.91 = 52.36% • Sum = 104.72% → 4.72% vig (juice) • Fair Player A = 52.36 / 1.0472 = 50.00% → fair decimal odds = 1 / 0.50 = 2.00 • Fair Player B = same → 2.00

The no-vig calculator above accepts decimal, American, or fractional inputs and gives you the fair price in your preferred format. Once you have the no-vig fair odds, pair them with the EV calculator to find the dollar value of any +EV bet you spot.