What is Vig in Sports Betting? The House Edge Explained
Vig is the reason most bettors lose long-term. To break even betting at -110, you need to win 52.4% of your bets — not 50%.
TL;DR: Vig (short for vigorish, also called “juice”) is the sportsbook’s profit margin built into betting odds. It’s the extra percentage above 100% that makes every bet slightly negative EV by default, which is why bettors need an informational edge to profit long-term.
Vig (short for vigorish, also called “juice”) is the sportsbook’s fee on every bet. It’s the house edge. It guarantees the sportsbook profits no matter who wins. At -110, you risk $110 to win $100. If the book gets equal bets on both sides, they collect $220 and pay $210 to the winner. They keep $10.
How Does Vig Work in Practice?
Think of a coin flip. A fair coin is 50/50. Fair odds are +100 on each side—risk $100 to win $100. But sportsbooks don’t offer fair odds. They price it at -110/-110. You risk $110 to win $100 on either side.
That gap between what you risk and what you win is the vig.
At -110 odds, the implied probability is 110 / (110 + 100) = 52.4%. Both sides at -110 add up to 104.8%. That extra 4.8% above 100% is the vig. It’s the sportsbook’s profit margin.
Vig Isn’t Always Equal on Both Sides
The -110/-110 example is the standard, but vig gets more interesting when lines are uneven. Consider a player prop:
- Over 25.5 points: -140
- Under 25.5 points: +115
The implied probabilities are:
- Over: 140/240 = 58.3%
- Under: 100/215 = 46.5%
- Total: 104.8%
The vig is still 4.8% but split unevenly. The “over” carries more vig. This happens when books adjust for popular side. They know many bettors take the over on stars. The less-vigged side is closer to the book’s real view.
How Much Does Vig Actually Cost You?
Vig is why most bettors lose. To break even at -110, you need 52.4% wins, not 50%. That 2.4% gap seems small. But over many bets, it’s huge.
Here’s a concrete example. Say you make 1,000 bets at $100 each, all at -110:
- At 50% win rate: Win 500 bets ($50,000) and lose 500 ($55,000). Net loss: -$5,000.
- At 52.4% win rate: Win 524 bets ($52,400) and lose 476 ($52,360). Net: $0.
- At 55% win rate: Win 550 bets ($55,000) and lose 450 ($49,500). Net: +$5,500.
You need 2.4% more wins than a coin flip just to break even. Research matters. Without a real edge, vig costs you money over time.
How to Find Lower Vig
Not all sportsbooks charge the same vig, and the difference matters more than most bettors realize.
Shop for reduced juice books. Some offer -105 instead of -110. This lowers your breakeven to 51.2%. Over 1,000 bets, you save thousands.
Compare specific markets. A book might have -110 on spreads but higher vig on player props. Check the vig on your specific market.
Use a no-vig calculator. Remove vig from any line to see the book’s true probability. This helps you compare books and measure your edge.
Time your bets. Vig changes throughout the week. Sunday lines might have tight vig. By game day, more casual bettors push it wider. Books sometimes tighten vig to attract sharp bettors.
Want to go deeper? Our free learning center starts with vig as the foundation of sports betting literacy — it’s literally the first lesson because understanding the house edge changes how you evaluate every bet. Start the Vig lesson →
How DumbMoneyPicks Helps You Navigate Vig
DumbMoneyPicks.ai starts with vig as step one. The platform helps you find situations where your edge beats the vig. It shows you if context suggests a different probability than the no-vig line.
The key question: “Does my research beat the vig?” If the no-vig line says 55% and you think 56%, you barely have an edge. If you think 63%, that’s real value.
DMP’s learning center starts with vig as the first lesson in a complete betting guide.
Frequently Asked Questions
Q: Is vig the same at all sportsbooks?
A: No. Most charge 4.5-5% vig. Reduced juice books charge 2-3%. Specialty markets charge 6%+. Always compare vig.
Q: Can I beat vig with 55% wins?
A: Only at good odds. At -110, you need 52.4% to break even. At -105, you need 51.2%. Win rate and odds both matter.
Q: Why do some bets have more vig?
A: Books shade lines toward popular sides. The popular side costs more. The sharper side costs less. That’s why comparing shops matters.
Ready to start finding edge beyond the vig? Try DumbMoneyPicks.ai free →
