Sports betting is designed so that the house profits over time, regardless of which side wins any individual game. The mechanism behind that is the hold percentage, and understanding it can change how you evaluate every line you bet.
What Is the Hold Percentage?
The hold percentage, also called the hold or the vig (short for vigorish), is the margin a sportsbook builds into every market. It represents the percentage of all money wagered that the book expects to keep as profit, assuming balanced action on both sides.
The hold is not a flat fee. It is expressed through the pricing of odds on each side of a market. When you add up the implied probabilities of all outcomes in a market, they exceed 100%. That excess is the hold.
How to Calculate the Hold Percentage
To calculate the hold, convert the odds on each side of a market to implied probability, then add them together.
The Formula
Implied probability for negative American odds: divide the odds value by the odds value plus 100.
Implied probability for positive American odds: divide 100 by the odds value plus 100.
A Standard NFL Spread Example
Most spread markets are priced at -110 on both sides. Here is what the math looks like:
- Side A at -110: 110 / (110 + 100) = 52.38%
- Side B at -110: 110 / (110 + 100) = 52.38%
- Total implied probability: 104.76%
The hold is 4.76%. For every $100 wagered across the market, the book expects to keep roughly $4.76 over the long run, provided the money is split evenly on both sides.
You can use our Odds Converter to quickly convert any American odds to implied probability and run this math yourself.
A Moneyline Example with Uneven Odds
Holds become more instructive on moneylines, where the two sides are priced asymmetrically.
Say a favorite is priced at -200 and the underdog at +165.
- Favorite at -200: 200 / (200 + 100) = 66.67%
- Underdog at +165: 100 / (165 + 100) = 37.74%
- Total implied probability: 104.41%
The hold here is 4.41%. Even though the odds differ sharply on each side, the book has still structured the market so both sides add up to more than 100%.
Why Sportsbooks Do Not Need Balanced Action to Profit
A common misconception is that sportsbooks always need exactly equal money on both sides to guarantee a profit. In reality, most books are comfortable taking a position on a game, especially when they have confidence in their lines. As long as the hold is large enough relative to any imbalance, the book can still come out ahead.
That said, a sportsbook will often move the line when one side attracts heavy action, both to manage its exposure and to draw bettors to the less popular side. Not every line move signals sharp action. Sometimes it is simply the book rebalancing.
If you want to track line movement driven by sharp bettors rather than public money, our Steam Moves tool surfaces those shifts in real time.
Why the Hold Matters for Bettors
It Sets the Bar You Need to Clear
The hold tells you exactly how much ground you need to make up before you can turn a long-term profit. At -110 on a standard spread, you need to win 52.38% of your bets just to break even, not 50%.
That gap matters. A bettor winning exactly 50% of their bets at -110 is not breaking even. They are losing at roughly 2.4% of their total handle. Over hundreds of bets, that adds up fast.
Shop for Lower Holds
Not all sportsbooks price their markets the same way. Some books offer reduced juice markets where spread bets are priced at -105 instead of -110. At -105, your break-even win rate drops to 51.22% instead of 52.38%.
That difference compounds over a full season. Consistently betting into lower hold markets is one of the most reliable edges available, before any handicapping skill is even factored in.
Comparing odds across multiple sportsbooks is the simplest way to reduce the hold you face on every bet. Our live odds comparison tool shows you the best available price across all major sportsbooks for any given game.
Hold and Expected Value Are Directly Related
Expected value (EV) measures how much a bet returns on average over time. The hold is one of the primary reasons most bets carry negative expected value. When you find a line that is mispriced relative to your own probability estimate, the hold shrinks or disappears as a factor. That is what serious bettors are looking for: spots where the true probability of an outcome exceeds what the odds imply.
You can run those numbers with our EV Calculator to see whether a specific bet is worth placing at the current price.
Key Takeaways
- The hold percentage is the sportsbook's built-in profit margin, calculated by adding the implied probabilities of all outcomes in a market and measuring how far they exceed 100%.
- A standard -110/-110 spread market carries a hold of roughly 4.76%, meaning you must win more than 50% of your bets just to break even.
- Sportsbooks do not need perfectly balanced action to profit. The hold gives them a cushion even when one side attracts more money.
- Comparing lines across sportsbooks helps you consistently bet into lower holds, improving your long-term results before handicapping skill is even considered.
- Understanding the hold connects directly to understanding expected value. The goal is always to find spots where the price offered underestimates the true probability of the outcome.
The hold is not a secret, but most casual bettors never account for it. When you treat odds as a price rather than just a number, and factor in the hold on every bet, you start making sharper decisions about where and when to wager.