Download the appBy Outlier · Updated
About the Vig Calculator
Vig, also called juice, is the sportsbook margin built into betting odds. This calculator removes that margin to estimate fair odds, then shows its average dollar cost for your stake.
How to use this calculator
- Enter the odds for every outcome in a two-way or three-way market.
- Select the outcome you want to bet on.
- Enter your stake.
- Compare the offered odds, fair odds, and estimated cost of vig.
Formula and definitions
- Raw win chance q = 1 ÷ d. Add all raw chances to get S.
- Fair win chance p = q ÷ S.
- An outcome’s margin share = q − p.
- Estimated vig cost = stake × (1 − p × d).
- d
- The offered decimal odds for the selected outcome.
- q and p
- The raw and fair win chances, written as decimals.
- S
- The total raw win chance across the market.
- Vig cost
- Estimated average loss at the fair win chance. It is not an extra fee.
Worked example
- At -110 on both sides, the fair win chance is 50% per side.
- A winning $100 bet earns about $90.91 profit. A loss costs $100.
- Expected profit = (0.50 × $90.91) − (0.50 × $100) ≈ −$4.55.
- The estimated vig cost is $4.55. The market overround is 4.76%.
How to read your result
The dollar cost is the average loss implied by the adjusted market win chance.
It is built into the odds. It is not a separate fee deducted from each winning bet.
Assumptions and limitations
- The estimate uses proportional margin removal. Your own model may give a different win chance.
- Exchange fees and taxes are not included.
- A negative cost means favorable prices under this method. It does not guarantee that a single bet wins.
Common mistake to avoid
Multiplying overround by your stake does not give the expected loss. Use the adjusted win chance and offered odds.
Put your result to work
Try a related calculator, or read our sports betting strategy guides to learn more.
- Hold Calculator — Market margin
- No-Vig Fair Odds Calculator — Odds without sportsbook margin
- Expected Value Calculator — Average profit or loss
Vig FAQs
Is vig the same as juice?
Yes. Both usually mean the margin built into betting odds. This tool shows the market overround as a percentage and the estimated cost to your bet in dollars.
Does a winning bet pay an extra vig fee?
For a standard sportsbook bet, the margin is already in the odds. The dollar cost shown here is an expected-value estimate, not an extra charge when the bet settles.
How results are calculated
Results use the formulas and assumptions above. Money is rounded to cents. Odds and percentages are rounded to make them easier to read.
The calculator uses the odds and win chances you enter. It does not load live odds.