Betting math
What -110 Means
What -110 Means in Betting and Why It Matters
When you see (-110) in sports betting odds, it means you need to risk $110 to win $100. This standard price point is the default for many straight bets and spreads, but why does it matter and how does it work?
A (-110) price point implies a 52.38% win probability, calculated as 110/210. So on a 100-bet sample, you need a 52-48 win rate to just break even. Fall a little short, even by a point or two, and you end up digging a hole.
As industry price standard, (-110) is a built-in sportsbook charge, making both sides come out to 104.76% when added up. That 4.76% overround represents a 4.55% hold when measured as a margin against total money wagered.
The corresponding win-percentage boosts for (-115) and (-120) are 53.49% and 54.55%. Those thresholds show why even small changes in the vig price matter in volume. In the same 100-bet example, a 55% win rate on (-110) bets gets you to +$550.
Line shopping for (-105) instead of (-110), when available, is an edge for the same win prob model.
Know your odds, and look for them.
Worked example
Break-even win rate by price
| Price | Risk | Break-even win rate | Book hold, both sides |
|---|---|---|---|
| -105 | $105 to win $100 | 51.22% | 2.38% |
| -110 | $110 to win $100 | 52.38% | 4.55% |
| -115 | $115 to win $100 | 53.49% | 6.52% |
| -120 | $120 to win $100 | 54.55% | 8.33% |
Hold = the bookmaker's share of all money wagered when both sides are priced the same.
100 bets of $110 at -110
| Wins | Profit / loss | Return on $11,000 staked |
|---|---|---|
| 50 of 100 | -$500.00 | -4.5% |
| 52 of 100 | -$80.00 | -0.7% |
| 53 of 100 | $130.00 | +1.2% |
| 55 of 100 | $550.00 | +5.0% |