TL;DR: Vig (vigorish, also called “juice”) is the sportsbook’s profit margin built into every set of odds. On a standard -110/-110 market, it’s about 4.8%. But on one-way prop markets like anytime TD scorer or home run props, the hidden vig can be 20-40% or more. Understanding vig is the difference between betting blind and betting informed.
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 regardless of outcomes.
At -110 odds, you risk $110 to win $100. If the book collects equal action on both sides, they take in $220 and pay out $210 to the winning side. They keep $10. That $10 is the vig, and it’s the reason most bettors lose money over time.
How Does Vig Work? The Math in 30 Seconds
Think of a coin flip. A fair coin is 50/50. Fair odds would be +100 on each side — risk $100 to win $100. But sportsbooks don’t offer fair odds. They price it at -110 on both sides.
The formula for converting American odds to implied probability is straightforward:
For negative odds (e.g., -110): Implied Probability = |Odds| / (|Odds| + 100)
For positive odds (e.g., +150): Implied Probability = 100 / (Odds + 100)
At -110: 110 / (110 + 100) = 52.4%. Both sides at -110 imply 52.4%, which adds up to 104.8%. That extra 4.8% above 100% is the sportsbook’s margin — the vig.
You can calculate the market vig on any two-way market with one formula:
Market Vig = (Implied Prob of Side A + Implied Prob of Side B) – 100%
At -110/-110: 52.4% + 52.4% – 100% = 4.8% vig.
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 distributed asymmetrically. The “Over” side carries more juice. This typically happens when books expect heavy public action on one side — they know recreational bettors love betting Overs on star players, so they shade the line accordingly. The less-vigged side is usually closer to the sportsbook’s true probability estimate.
Two-Way vs. One-Way Markets: Where Vig Gets Dangerous
This is the part most betting guides skip, and it’s arguably the most important thing to understand about vig.
Two-Way Markets (Over/Under)
Standard Over/Under props are two-way markets. Both sides are posted:
- LeBron Over 24.5 Points: -115
- LeBron Under 24.5 Points: -115
You can see both prices, so you can calculate the vig. Implied probabilities: 53.5% + 53.5% = 107.0%. The vig is 7.0%. Higher than the standard -110/-110, but at least it’s visible and calculable. Two-way markets are generally more efficient because they attract more action, better price discovery, and more competition between sportsbooks.
One-Way Markets (Yes-Only)
Some of the most popular bet types are one-way markets — you can only bet one side:
- Travis Kelce Anytime Touchdown Scorer: Yes +110
- Shohei Ohtani to Hit a Home Run: Yes +350
- First Basket Scorer: LeBron James +500
There’s no “No” option listed. And that’s where the vig gets dangerous.
When you can’t see both sides, you can’t calculate the market vig using the formula above. The sportsbook’s margin is hidden inside the single price — and it’s typically 20% to 40% or more. Compare that to the 4-5% you’d see on a standard two-way prop.
Here’s a concrete example. Say a player’s true anytime TD probability is 25%. Fair odds would be +300. But the sportsbook might price it at +230, implying a 30.3% break-even probability. That’s a 5.3 percentage point gap — a hidden vig of over 21%. You’d never accept that margin on an Over/Under prop, but on a one-way market, most bettors don’t even realize it’s there.
Juiced Two-Way Markets (The Middle Ground)
Sometimes both sides are listed, but one side is so heavily juiced it’s practically unbettable:
- Kelce Anytime TD: Yes +350
- Kelce Anytime TD: No -500
This is technically a two-way market, but the “No” side at -500 requires risking $500 to win $100. The vig is distributed to discourage action on the “No” side, making it function more like a one-way market.
How Much Does Vig Actually Cost You?
Vig is why most bettors lose. To break even at -110, you need a 52.4% win rate — not 50%. That 2.4% gap sounds small. Over hundreds of bets, it’s enormous.
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 profit) and lose 500 ($55,000 risked). Net loss: -$5,000.
- At 52.4% win rate: Win 524 ($52,400) and lose 476 ($52,360). Net: approximately $0. Break-even.
- At 55% win rate: Win 550 ($55,000) and lose 450 ($49,500). Net: +$5,500.
You need 2.4 percentage points above a coin flip just to break even. Research matters. Without a real edge, vig costs you $5,000 per 1,000 bets at standard -110 juice.
And remember: that’s on two-way markets with transparent vig. On one-way props with 20-40% hidden margin, the hurdle is dramatically steeper.
The Line Is a Price, Not a Prediction
This is a mental shift that changes how you think about vig and betting in general. When you see a player’s points prop at 26.5, the sportsbook is not predicting that the player will score exactly 26.5 points.
The line is the price where the sportsbook believes they can balance their risk and earn their margin. It reflects supply and demand, liability management, and competitive pricing against other books. It’s a market price — not an oracle.
Why this matters for vig: if you treat the line as a prediction, you’ll assume the sportsbook knows more than you and accept whatever price they offer. But the sportsbook isn’t trying to predict outcomes with perfect accuracy. They’re trying to set a price that generates profit through the vig. Your edge comes from finding spots where the price is wrong — where your probability estimate exceeds the break-even threshold by enough to overcome the vig.
How Vig Connects to the Bigger Picture
Understanding vig is the foundation for seeing how the prop market really works:
Player props carry more variance than game spreads because you’re betting on one player’s performance, not an entire team’s outcome. Expect longer losing streaks and bigger swings — your bankroll management needs to account for this.
Context matters more than season averages. A season average is just a starting point. Matchups, pace, and game script drive nightly results, and those contextual factors are where edges live.
Late information creates edges. If you can incorporate injury news or lineup changes faster than the market adjusts, your probability estimate will be more accurate than the line.
And the market is efficient but not perfect. Sportsbooks can’t price 2,000+ props perfectly every night. Edges exist if you work to find them — particularly in less liquid markets where books invest fewer resources.
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 sportsbooks offer -105 instead of -110 on standard markets. That lowers your break-even from 52.4% to 51.2%. Over 1,000 bets, the savings add up to thousands of dollars. A five-cent improvement in average odds (getting -110 instead of -115) can mean over $2,000 in additional profit across 1,000 bets.
Compare specific markets. A book might offer competitive vig on spreads but charge significantly more on player props. Always check the vig on your specific market — not just the book’s reputation for main lines.
Use a no-vig calculator. Strip the vig from any line to see the sportsbook’s true implied probability. This lets you compare books apples-to-apples and measure your actual edge. The formula: divide each side’s implied probability by the total implied probability (sum of both sides).
Be especially cautious with one-way markets. Anytime TD scorers, home run props, and first basket bets carry substantially more vig than Over/Under props. You need a correspondingly larger edge to make these profitable.
Want to go deeper? Our free learning center starts with vig as the foundation of sports betting literacy — it’s 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 by devigging odds from five sharp sportsbooks to find the true consensus probability — the market’s best estimate with the vig stripped away. This gives you a clean baseline to compare against.
The platform’s research panel then shows you the contextual factors that might make the true probability higher or lower than that devigged baseline. If the no-vig implied probability is 55% and your research suggests 63%, that’s real value. If the no-vig line says 55% and you think 56%, the edge is razor thin and probably not worth the risk.
DMP’s learning center starts with vig as the first lesson in a complete betting guide — because everything else builds on understanding the price you’re paying.
Frequently Asked Questions
What does vig mean in sports betting?
Vig (short for vigorish, also called juice) is the sportsbook’s commission on every bet. It’s built into the odds and ensures the sportsbook profits regardless of outcomes. At standard -110/-110 odds, the vig is about 4.8%. It’s the reason you need to win more than 50% of your bets just to break even.
Is vig the same at all sportsbooks?
No. Standard sportsbooks charge 4-5% on main markets. Reduced juice books charge 2-3%. Prop markets often carry 6-8% or more. One-way markets like anytime TD scorer or home run props can have 20-40% hidden vig. Always compare vig across books before placing a bet.
How do I calculate the vig on a bet?
For a two-way market, convert both sides to implied probabilities using the formulas above, add them together, and subtract 100%. At -110/-110, that’s 52.4% + 52.4% – 100% = 4.8% vig. For one-way markets, you can’t calculate it directly — which is exactly why those markets carry higher hidden vig.
Can I beat vig with a 55% win rate?
At -110 odds, a 55% win rate produces about a 4.64% ROI — that’s solidly profitable. But the answer depends entirely on the odds. At -150, you’d need 60% to break even, so 55% would be a loser. Win rate and price both matter, which is why expected value (EV) is more useful than win rate alone.
Why do player props have higher vig than spreads?
Sportsbooks invest more resources in pricing main markets (spreads, totals). Props are less liquid, priced less efficiently, and attract more recreational action. The combination means books can charge higher vig on props. The tradeoff: this same inefficiency is what creates opportunities for informed bettors.
Ready to start finding edge beyond the vig? Try DumbMoneyPicks.ai free