Vig Calculator — Free Vigorish & Juice Calculator
Calculate the vig (juice) built into any sportsbook line. Enter American odds for both sides to instantly see the house edge, true implied probabilities, and no-vig fair odds.
Odds format
Saved for all betting calculators
e.g. -110 or +150
e.g. -110 or +150
e.g. -110 or +150
e.g. -110 or +150
Vig (Juice)
4.55%
house edge
Overround
104.76%
| Side | Implied (with vig) | No-vig prob. | No-vig odds |
|---|---|---|---|
| Side A | 52.38% | 50.00% | +100 |
| Side B | 52.38% | 50.00% | +100 |
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How it differs: this calculator measures the margin built into a line. To take that margin out and get fair odds, use the No-Vig Calculator; to read a single price as a probability, the Implied Probability Calculator.
How to Use the Vig Calculator
Using the vig calculator is simple. Enter the American odds for both sides of a bet — for example, -110 / -110 on a standard NFL point spread, or -115 / -105 on a moneyline with shaded lines. The calculator will instantly show you the vig percentage, the implied probabilities with the juice baked in, and the true (no-vig) fair odds that reflect the actual probability of each outcome.
American odds can be entered as negative numbers (favorites, e.g. -110) or positive numbers (underdogs, e.g. +130). The calculator supports all standard American odds formats used by US sportsbooks.
Use the no-vig odds to compare lines across books — if one book offers better odds than the fair value, you have a positive expected value (+EV) opportunity.
The Formula
The vig calculation follows these steps:
- Convert American odds to implied probability:
- Negative odds (e.g. -110): prob = |odds| ÷ (|odds| + 100)
- Positive odds (e.g. +130): prob = 100 ÷ (odds + 100)
- Overround = Implied Prob A + Implied Prob B
(Always > 100% when vig is present; e.g. -110/-110 gives 104.76%) - Vig % = (Overround − 1) ÷ Overround × 100
- No-vig probability = Implied Prob ÷ Overround
- No-vig American odds = convert fair probability back to American format
For standard -110 / -110 lines: each side has an implied probability of 52.38%, giving an overround of 104.76% and a vig of 4.55%. The true fair odds for both sides are +100 (even money), meaning a coin-flip event.
Practical Examples
Example 1 — Standard Point Spread (-110 / -110)
- Side A: -110 → implied probability 52.38%
- Side B: -110 → implied probability 52.38%
- Overround: 104.76%
- Vig: 4.55%
- No-vig odds: +100 / +100 (true 50/50 coin flip)
For every $110 bet on each side, the book collects $220 and pays out $210. The $10 difference is the house profit — 4.55% of total handle.
Example 2 — Moneyline with Juice (-150 / +130)
- Side A (favorite): -150 → implied probability 60.00%
- Side B (underdog): +130 → implied probability 43.48%
- Overround: 103.48%
- Vig: 3.36%
- No-vig odds: -138 / +138
The book shades the line by about 6 cents total. If you can find a book offering +135 on the underdog, that is a +EV bet relative to the true fair odds.
Why Vig Matters for Bettors
At -110 on both sides you need to win 52.38% of your bets just to break even. At -115, the break-even rate climbs to 53.49%. Shopping for the best lines — even saving half a point — materially improves your long-run results. Line shopping across multiple books is the single highest-ROI habit for serious sports bettors.
Frequently Asked Questions
Vig, also called juice or vigorish, is the commission a sportsbook charges for accepting a bet. It is built directly into the odds. On a standard NFL point spread, both sides are listed at -110 instead of +100 (even money). That extra -10 is the vig — the book collects it regardless of which side wins, ensuring a built-in profit margin of about 4.55% on balanced action.
Sportsbooks aim to attract balanced action on both sides of a bet. When they achieve perfect balance, they collect more than they pay out — the difference is the vig. For example, if 100 bettors each wager $110 on Team A and 100 bettors each wager $110 on Team B, the book collects $22,000 total and pays out $21,000 to the winners ($110 × 100 ÷ 1.1 per side plus return of stake). The remaining $1,000 is pure profit regardless of the game result.
A no-vig (or fair) line is what the odds would be if the sportsbook charged zero commission. To calculate it, you remove the overround by dividing each side's implied probability by the total overround. For -110/-110, the overround is 1.0476, so each side's true probability is 52.38% ÷ 1.0476 = 50.00%, giving fair odds of +100 on both sides. No-vig odds are useful for identifying positive expected value (+EV) bets when another book offers better than the fair price.
Standard US sportsbook vig on point spreads is 4.55% (both sides at -110). Reduced-juice books like Pinnacle, BetOnline, or 5Dimes offer -105/-105 lines, cutting the vig to about 2.38%. Parlays typically carry much higher implied vig — often 15–30% — because the sportsbook multiplies their edge across each leg. Always use a vig calculator to compare the true cost before placing any bet.
Enter the odds from your primary book to find the no-vig fair odds. Then check other books for the same game. If any book offers odds better than the fair value (e.g. fair odds are -138 and a book offers -130), you have a positive expected value (+EV) bet. Over a large sample, consistently betting +EV lines is the foundation of profitable sports betting. This is why line shopping across 3–5 books is essential for serious bettors.
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