A practical explanation of -110 odds, including payout, profit, break-even rate, and how to evaluate these prices.
You open your sportsbook app to bet the Chiefs -3.5 against the Bills. Next to the spread, you see -110. You know you like the Chiefs, but what does that number actually mean for your wallet?
-110 means you risk $110 to win $100 in profit. That extra $10 is the sportsbook's fee — called the vig (short for vigorish) or juice.
If you bet a different amount, the ratio stays the same. Here is what -110 looks like at common stake sizes:
| Stake | Profit if You Win | Total Return |
|---|---|---|
| $25 | $22.73 | $47.73 |
| $50 | $45.45 | $95.45 |
| $100 | $90.91 | $190.91 |
| $200 | $181.82 | $381.82 |
The formula: Profit = Stake × (100 / 110)
Use the Single Bet Calculator to check any stake instantly — no math required.
-110 is the standard price on spreads and totals at most North American sportsbooks. When you see a line like Chiefs -3.5 (-110) vs. Bills +3.5 (-110), both sides are priced the same.
That might seem fair, but add up the implied probabilities and you will see the sportsbook's edge:
A fair market totals 100%. The 4.76% above that is the vig — the sportsbook's built-in profit margin.
Tip: Not all books charge the same juice. Some offer -105 on spreads and totals. Shopping lines across 2-3 sportsbooks is the easiest way to reduce the vig you pay over time.
At -110, you need to win 52.38% of your bets to break even. Here is why:
If you place 100 bets at $110 each, you risk $11,000 total. At a 52.38% win rate, you win about 52.4 bets and lose 47.6:
Anything above 52.38% puts you in profit. Anything below means the vig is eating your bankroll.
-110 is not inherently good or bad — it depends on what you are betting.
Worth it: You estimate the Chiefs cover the spread 56% of the time. Your edge is 56% - 52.38% = 3.62 percentage points. Over 100 bets at $100 stake, that edge translates to roughly $330 in expected profit.
Not worth it: You estimate the Chiefs cover only 50% of the time. You are 2.38 points below break-even. At $100 per bet over 100 bets, you expect to lose about $230.
Use the +EV Calculator to quantify your edge in dollars before placing any wager.
How does -110 stack up against other odds you will see?
| Odds | Risk to Win $100 | Break-Even % | Vig (2-way market) |
|---|---|---|---|
| -105 | $105 | 51.22% | 2.44% |
| -110 | $110 | 52.38% | 4.76% |
| -115 | $115 | 53.49% | 6.98% |
| -120 | $120 | 54.55% | 9.09% |
The difference between -105 and -120 looks small, but over hundreds of bets it compounds significantly. Every point of juice you save goes straight to your bottom line.
Plug -110 into the Single Bet Calculator with your usual stake size. Then try the Odds Converter to see -110 in decimal (1.909), fractional (10/11), and implied probability (52.38%) formats side by side.
A $100 bet at -110 wins about $90.91 in profit, for a total return of $190.91.
You need to win 52.38% of your bets at -110 to break even over time.
Pricing both sides at -110 gives the sportsbook a 4.76% margin (the vig). This built-in edge is how they profit regardless of which side wins.