Betting Odds Calculator & Converter
How Odds Work
American Odds: Negative (-110) means favorite — bet that amount to win $100. Positive (+200) means underdog — bet $100 to win that amount.
Decimal Odds: Your total payout per $1 wagered. Odds of 2.50 mean a $10 bet returns $25 total ($15 profit + $10 stake).
Fractional Odds: Show profit relative to stake. Odds of 3/1 mean $3 profit for every $1 bet.
Implied Probability: The real percentage chance the odds represent. Compare this to your own estimate to find value bets.
Betting Odds Conversion Chart
Quick reference for converting common American odds to decimal odds, fractional odds, and implied probability, with the profit on a $100 bet. From short favorites like −110 odds through even-money +100 odds to longshots like +1000 odds.
| American | Implied Probability | Decimal | Fractional | Profit on $100 |
|---|---|---|---|---|
| −500 | 83.3% | 1.20 | 1/5 | $20.00 |
| −300 | 75.0% | 1.33 | 1/3 | $33.33 |
| −200 | 66.7% | 1.50 | 1/2 | $50.00 |
| −150 | 60.0% | 1.67 | 2/3 | $66.67 |
| −120 | 54.5% | 1.83 | 5/6 | $83.33 |
| −110 | 52.4% | 1.91 | 10/11 | $90.91 |
| +100 | 50.0% | 2.00 | 1/1 | $100.00 |
| +110 | 47.6% | 2.10 | 11/10 | $110.00 |
| +120 | 45.5% | 2.20 | 6/5 | $120.00 |
| +135 | 42.6% | 2.35 | 27/20 | $135.00 |
| +150 | 40.0% | 2.50 | 3/2 | $150.00 |
| +170 | 37.0% | 2.70 | 17/10 | $170.00 |
| +200 | 33.3% | 3.00 | 2/1 | $200.00 |
| +250 | 28.6% | 3.50 | 5/2 | $250.00 |
| +300 | 25.0% | 4.00 | 3/1 | $300.00 |
| +400 | 20.0% | 5.00 | 4/1 | $400.00 |
| +500 | 16.7% | 6.00 | 5/1 | $500.00 |
| +1000 | 9.1% | 11.00 | 10/1 | $1,000.00 |
| +1200 | 7.7% | 13.00 | 12/1 | $1,200.00 |
Betting Odds FAQ
What does +100 odds mean?
+100 odds (also called "even money" or a "pick'em") mean a $100 bet wins $100 in profit, plus your stake back for a $200 total payout. The implied probability is 50%, and it converts to 2.00 in decimal odds and 1/1 fractional.
What does +110 odds mean?
+110 odds mean a $100 bet returns $110 in profit ($210 total). That's an implied probability of 47.6%, or 2.10 in decimal odds.
What does +200 odds mean?
+200 odds mean the team is an underdog: a $100 bet wins $200 profit ($300 total). The implied probability is 33.3%, equal to 3.00 decimal or 2/1 fractional.
What does +1000 odds mean?
+1000 odds mark a longshot. A $100 bet wins $1,000 in profit ($1,100 total). The implied probability is just 9.1%, or 11.00 in decimal odds (10/1 fractional).
What does −110 odds mean?
−110 is the standard "juice" on a point spread: you bet $110 to win $100. It carries a 52.4% implied probability and converts to 1.91 decimal odds.
How do you convert American odds to implied probability?
For positive odds, implied probability = 100 ÷ (odds + 100). For negative odds, it = |odds| ÷ (|odds| + 100). For example, +200 → 100 ÷ 300 = 33.3%, and −150 → 150 ÷ 250 = 60%.