Bookmaker Hold & Margin Calculator

What Is Bookmaker Hold (Vig/Margin)?

Bookmaker hold, commonly called vig (short for vigorish) or juice, is the built-in profit margin that sportsbooks charge on every market. It works by pricing odds so that the implied probabilities of all outcomes sum to more than 100%. That excess above 100% is the overround, and it represents the bookmaker's edge.

Consider a coin flip. The true probability of heads or tails is 50% each, so fair decimal odds would be 2.00 on both sides. Instead, a bookmaker might price both at 1.91 (or -110 in American odds). Each side now has an implied probability of 52.36%, totaling 104.72%. The 4.72% overround is the hold. On every $100 wagered across both sides, the book expects to keep $4.72 regardless of the outcome.

How to Calculate Bookmaker Margin

The formula is straightforward. First, convert all odds to decimal format. Then calculate implied probability for each outcome: implied = 1 / decimal_odds. Sum all implied probabilities to get the overround. The margin is: margin = (overround - 1) × 100%.

To find the no-vig (fair) probability for any outcome, divide its implied probability by the total overround: fair_prob = implied / overround. The fair odds are then 1 / fair_prob. These are the odds you would get in a perfectly efficient, zero-margin market. Use our odds converter to translate between formats.

Sharp vs. Soft Books: Typical Margins

Not all sportsbooks charge the same margin. Sharp books like Pinnacle (PS3838), Circa, and Bookmaker.eu compete on price and run thin margins of 1.5-3% on major markets. They accept large bets and rarely limit winners. Soft books like DraftKings, FanDuel, and BetMGM charge higher margins of 5-10%+, especially on player props, parlays, and live bets. They subsidize promotional offers through wider spreads.

Margins also vary by sport and market type. NFL spreads and totals at Pinnacle carry about 2% margin. The same market at a retail book might be 4-6%. Player props often carry 8-15% margin at soft books. Prediction markets like Kalshi and Polymarket have variable spreads depending on market maker activity and liquidity. Our best sportsbooks for arbitrage guide covers which books offer the lowest vig.

How Margin Affects Your Long-Term Profitability

Hold directly determines your expected cost of betting. If you bet randomly on a market with 5% hold, you lose roughly 2.5% of every dollar wagered (the margin is split across outcomes). Over thousands of bets, this compounds into a significant drag. A bettor wagering $1,000 per week on 5% hold markets loses approximately $1,300 per year to margin alone.

For arbitrage bettors, hold is the enemy. You need the combined margin across two books to be less than the price discrepancy to lock in risk-free profit. If Book A has 4% hold and Book B has 6% hold, you need a price difference exceeding their combined margin to arb. That is why arbing typically works best when at least one leg is at a sharp, low-margin book. Calculate your edge precisely with our EV calculator.

Using Low-Margin Books for Arbitrage

The classic arbitrage setup pairs a sharp book (low hold, accurate odds) with a soft book (high hold, slower to update). When the soft book lags behind a line move, its price temporarily disagrees with the sharp book's price, creating an arbitrage window. The lower the sharp book's margin, the smaller the discrepancy needed to generate a profit. With Pinnacle at 2% hold and a retail book at 6%, you only need the lines to disagree by a few cents to profit.

Use the Compare Books mode above to check whether the best odds across multiple books create a negative-hold situation (which means an arb exists). For a deeper dive into finding and executing these opportunities, read our arbitrage betting calculator guide and learn how to find arbitrage bets consistently.

Frequently asked questions

What is bookmaker hold (vig)?

Bookmaker hold, also called vig (vigorish), juice, or margin, is the percentage the sportsbook keeps as profit on every market. It is the difference between the true probability of all outcomes and 100%. For example, if a bookmaker prices a coin flip at -110 on both sides, the implied probabilities sum to 104.76%, meaning the hold is 4.76%. This margin is how sportsbooks guarantee profit regardless of the outcome.

How do you calculate bookmaker margin?

To calculate bookmaker margin: (1) Convert all odds to implied probabilities by dividing 1 by the decimal odds. (2) Sum all implied probabilities. This total is called the overround. (3) Subtract 1 (or 100%) from the overround. The result is the margin. For example, with decimal odds of 1.91 and 1.91 on a two-way market: (1/1.91) + (1/1.91) = 0.5236 + 0.5236 = 1.0471. The margin is 1.0471 - 1 = 0.0471, or 4.71%.

What is a good hold percentage for a sportsbook?

Sharp books like Pinnacle typically have a hold of 1.5-3% on major markets. Average books (Bet365, William Hill) sit around 3-6%. Soft books (DraftKings, FanDuel on some markets) can charge 6-10% or more, especially on player props and parlays. For arbitrage bettors, the lower the hold the better, because low-hold books price closer to true odds and are less likely to limit winning accounts.

How does hold differ between sportsbooks?

Hold varies dramatically between books. Sharp books (Pinnacle, Circa, PS3838) compete on price and run thin margins of 1-3%. Retail books (DraftKings, FanDuel, BetMGM) charge higher margins of 5-10%+, especially on props and live bets. Prediction markets like Kalshi and Polymarket have variable spreads set by market makers. The same NFL moneyline might have a 2.1% hold on Pinnacle but a 7% hold on a retail book.

Why does bookmaker hold matter for bettors?

Hold directly determines your long-term expected loss. On a market with 5% hold, the bookmaker takes roughly $5 of every $100 wagered before any edge you might have. Lower hold means you need a smaller edge to be profitable. For arbitrage bettors, hold matters because you need the combined hold of two books to be less than the price discrepancy to lock in risk-free profit. Sharp bettors always shop for the lowest-hold books.

What is overround in betting?

Overround is the total of all implied probabilities in a market. In a fair market, the overround would be exactly 100% (or 1.00). Bookmakers set the overround above 100% to build in their margin. For example, an overround of 105% means the book has a 5% margin. The term comes from horse racing where it describes how much the book goes 'over the round' of 100%. Lower overround means fairer prices for bettors.