Bookmaker Margin Calculator
Calculate bookmaker margin (vig/juice), fair probabilities and the cost per $1,000 wagered. Compare sportsbook value across markets.
Every sportsbook builds a margin (also called vig, juice, or overround) into their odds. This margin is the house edge — the reason bookmakers profit regardless of outcomes. A 5% margin means the book keeps $50 of every $1,000 wagered. The difference between sportsbooks is enormous: Pinnacle runs 2-3% margins on major markets, SBOBET around 3-4%, while recreational books like Dafabet or 1xBet often charge 6-8% or more on the same event. Over hundreds of bets, that gap costs you thousands. This calculator takes the odds for each outcome and reveals the exact margin, the fair (no-vig) probability for each outcome, and a clear verdict on whether you are getting sharp or inflated odds. For Asian handicap bettors, margin comparison is especially valuable because AH markets at sharp books often carry half the margin of 1X2 markets at recreational books.
Enter decimal odds for each outcome to see how much the bookmaker charges you.
About this calculator
Every sportsbook builds a margin (also called vig, juice, or overround) into their odds. This margin is the house edge — the reason bookmakers profit regardless of outcomes. A 5% margin means the book keeps $50 of every $1,000 wagered. The difference between sportsbooks is enormous: Pinnacle runs 2-3% margins on major markets, SBOBET around 3-4%, while recreational books like Dafabet or 1xBet often charge 6-8% or more on the same event. Over hundreds of bets, that gap costs you thousands. This calculator takes the odds for each outcome and reveals the exact margin, the fair (no-vig) probability for each outcome, and a clear verdict on whether you are getting sharp or inflated odds. For Asian handicap bettors, margin comparison is especially valuable because AH markets at sharp books often carry half the margin of 1X2 markets at recreational books.
How It Works
Enter the decimal odds for Home, Draw (optional for 2-way markets), and Away. The calculator computes the total margin, extracts fair probabilities by removing the vig, and gives a verdict on the odds: sharp, average, or high margin.
Frequently Asked Questions
What is a good bookmaker margin?
For major football or basketball markets: under 3% is sharp (Pinnacle-level), 4-6% is average (Bet365, SBOBET), and above 7% is expensive (Dafabet, 1xBet on secondary markets). For niche leagues, even sharp books may run 4-5%. Always compare the margin on the specific market you are betting.
How do I calculate fair odds from bookmaker odds?
Sum the implied probabilities of all outcomes (1/odds for each). Divide each individual implied probability by this sum. The result is the fair probability. To get fair odds, take 1 divided by the fair probability. Example: odds 1.90/1.90 imply 52.6% each, sum 105.3%, fair probability is 52.6%/105.3% = 50%, fair odds = 2.00.
Does margin differ between market types at the same book?
Yes, significantly. At Pinnacle, main 1X2 and AH markets carry 2-3% margin, but totals, correct score, and player props may carry 5-8%. At recreational books, the gap is even wider. Always check margin on the specific market type, not just the book's headline rate.
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