What is Vigorish in Sports Betting?

What is Vigorish?

Vigorish, often referred to as vig or juice, is the percentage of a bet sports wagerers pay a sportsbook on each bet. 

The amount of vig a customer pays varies with almost every bet. Vig sports betting once went by a standard 10% fee. But, the use of computers and more complex betting options has allowed sportsbooks to set each wager with a built-in vig that is smaller but different in almost every bet in every sport.

How to Calculate Vig from a Sports Bet

Much of gambling is a matter of analyzing numbers, and figuring the vigorish on a typical moneyline sports bet involves basic math. Here’s how to calculate vig from a sports bet:

1. You must first calculate the implied probability percentage of the outcome for both sides. The formula for positive moneyline odds is 100 divided by (odds value +100). For negative odds, absolute odds value/ (absolute odds value +100) gives you the implied probability.

• Example: In a game in which the underdog is +105, and the favorite is -115:
• 100 / (105 + 100) = .487 or 48.7% is the implied probability for the dog.
• 115 / (115 + 100) = .534 or 53.4% is the implied probability for the fav.

2. Add the implied probabilities from each side.

• From our example: 48.7 + 53.4 = 102.1

3. Subtract 100 for the vig or juice.

• 102.1 – 100 = 2.1
• 2.1% is the vigorish for our example.

For point spreads, the moneylines are generally -110 for both sides, accounting for the customary 10% bookmakers have charged for years.

Vig on Common Lines

You can add the implied probabilities of any two of the following common moneylines to get the juice on a matchup. For instance, -150 (60) and +125 (44.44) gives the book 4.4% juice.  

The probabilities also indicate the percentage of those bets you would have to win to break even. For instance, if you consistently wagered -110 for the standard 10% juice, you would have to win 52.38% of your total wagers to break even. You can also assess an expected value from an individual bet by comparing the implied probability to a true probability.

Why Vigorish Matters

The vigorish matters because it varies between sportsbooks and individual bets. You should shop around to find a book with the best deal for the side you like. Remember that sportsbooks create lines that attract an equal amount of betting on both sides, and the vigorish allows them to profit regardless of who wins.

Tactics for Reducing the Power of the Sportsbook’s Vig

Auspicious sports bettors have a few tricks up their sleeves to help combat the power of vig. Here’s how to get an upper hand:

Take Tighter Odds

Consider taking wagers when the underdog moneyline is closer to the favorite, like -120 and +110. When you see lines like +125 vs. -145, the house is getting more vig. A good rule of thumb is to avoid more than a 40-money-point difference, such as -130 vs. +110.

Look For Deals

Watch for no-juice and odds-boost promotions. If a sportsbook offers +100 for both sides of a bet, you have an even chance rather than a chance of “losing the juice.” Odds boosts can be significant enough to consider as well.

Avoid Parlays

Sportsbooks heavily promote parlays because their calculated vigorish favors the house much more. Besides, it’s hard enough to pick one outcome, much less three or more. You can calculate the parlay vig the same way as we demonstrated by adding the implied probabilities of each leg.

Vig is the Sportsbook’s House Edge

So, what is vig in sports betting? It is how sportsbooks make a profit, and there’s no way around it. But you can narrow the sportsbook’s edge by keeping an eye on vigorish rates and looking for bargains on the sides you like. Use the formulas and tips we’ve set out and get more bang for your buck.

Consider signing up at multiple sportsbooks so you can shop around for the best odds.