Why is -110 not a 50/50 bet?
Because at -110 you risk $110 to win $100, you need to win 52.4% of the time just to break even. The game itself is a coin flip. The extra 2.4 points is the book's fee, baked into every line. Beating it means only betting when your price beats the true no-vig number.
For months I thought I was just unlucky. Small losses, over and over. I blamed variance, bad beats, cold streaks. The real problem was quieter and it was sitting inside every single line I bet.
The fee you never see
Every line at every sportsbook has the book’s cut baked in. That’s why both sides of a spread sit at -110 instead of +100. The game is a coin flip, but the price isn’t.
At -110 you’re risking $110 to win $100. Do the division and that price implies a 52.4% chance. Both sides at -110 implies 104.8% total probability, which is impossible. The extra 4.8% is not a rounding error. It’s the fee.
Breakeven % = risk / (risk + win) = 110 / 210 = 52.4%That 2.4-point gap is the whole story. You can pick winners at better than a coin-flip rate and still lose money, because the bar was never 50%. It was 52.4%, on every bet, forever.
Why it doesn’t feel like losing
A few percent against you on one bet barely registers. You win some, you lose some, the balance drifts down slowly enough to blame on luck.
Over thousands of bets it’s not a drift, it’s a drain. I logged my bets and watched it happen to me. The losing wasn’t a curse. It was a tax I was paying on every single wager, and I never noticed because nobody sends you a receipt for vig.
How you actually beat it
One rule: only bet when your price beats the true, no-vig number.
Strip the vig from the market (take both sides, convert to implied probability, divide yours by the total) and you get the fair price. If the price you’re being offered beats fair, the edge is yours. If it doesn’t, the edge is the book’s, no matter how good the pick feels. That’s the entire definition of +EV betting.
Two easy ways to end up on the right side of that line:
- Line shopping. The same bet is priced differently across books. Taking the best number keeps more of your edge on every bet.
- Profit boosts. A boost pushes your payout above what the vig normally allows. A real boost on a fairly priced bet flips the fee into your pocket. That’s the math the boost EV calculator runs, and this article walks through it with real examples.
Once I saw the vig, the losing finally made sense. I wasn’t cursed. I was paying a fee on every bet, and the day I stopped paying it is the day the graph turned around.
Quick answers
What is vig in sports betting?
The vig (or juice) is the book's fee baked into the odds. On a -110/-110 market the two sides imply 104.8% probability. The extra 4.8% doesn't belong to either team, it belongs to the book.
Why are both sides -110 instead of +100?
If both sides were +100 the book would make nothing on a balanced market. Pricing both at -110 means whichever side wins, the book kept a cut of the losing side's stake.
What win rate do you need to break even at -110?
52.38%. Risk $110 to win $100 and anything below that rate loses money over time, even if you pick winners more often than not.
How do you remove the vig from odds?
Convert both sides to implied probability, add them, then divide your side by the total. On -110/-110 that's 52.4 / 104.8 = 50%, so the fair price is +100. That process is called devigging.
Wanna see which boosts cleared the bar today?
The bot checks every boost at every book each morning, posts the ones worth taking with the math shown, and grades everything in public. Watching is free.