Odds
converter
Type a price in any format. You'll see it in the other two, the win chance it needs, and what $100 wins.
Enter odds as American (-110, +150), decimal (1.91) or fractional (10/11). Everything is worked out in your browser. Nothing is saved or sent.
Common prices
| American | Decimal | Fractional | Implied | $100 wins |
|---|---|---|---|---|
| -500 | 1.20 | 1/5 | 83.3% | $20.00 |
| -300 | 1.333 | 1/3 | 75.0% | $33.33 |
| -200 | 1.50 | 1/2 | 66.7% | $50.00 |
| -150 | 1.667 | 2/3 | 60.0% | $66.67 |
| -120 | 1.833 | 5/6 | 54.5% | $83.33 |
| -110 | 1.909 | 10/11 | 52.4% | $90.91 |
| +100 | 2.00 | 1/1 | 50.0% | $100.00 |
| +120 | 2.20 | 6/5 | 45.5% | $120.00 |
| +150 | 2.50 | 3/2 | 40.0% | $150.00 |
| +200 | 3.00 | 2/1 | 33.3% | $200.00 |
| +300 | 4.00 | 3/1 | 25.0% | $300.00 |
| +500 | 6.00 | 5/1 | 16.7% | $500.00 |
How the formats relate
Decimal is what 1 returns, stake included. 2.50 returns $2.50 for $1. Fractional is profit over stake: 3/2 wins $3 for every $2. American is built around $100: plus odds are the profit on $100, minus odds are the stake needed to win $100.
Prediction markets show prices as cents (Kalshi, Underdog Prediction Picks) or percentages (Novig) instead. A contract at 40¢ or 40% pays $1 if it wins, which is 2.50 in decimal or +150 American, before any fees. Type 40% or 40c above, or use the prediction market calculator to include fees.
Questions
What does -110 mean?
A minus number is how much you stake to win $100. At -110 you stake $110 to win $100 ($210 back). A plus number is what a $100 stake wins: +150 wins $150.
What is implied probability?
The win chance a price needs to break even. It’s 1 divided by the decimal odds. -110 is 1.909 in decimal, so it needs 52.38%.
Why do both sides of a game add up to more than 100%?
The extra is the site’s cut, often called vig or juice. Two sides at -110 add up to 104.76%. The no-vig calculator strips it out to show the fair price.
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These calculators do math, not predictions. No price is a sure thing: sites can change lines, cancel picks made at a wrong price, limit accounts, or close markets before you place the other side. Never stake money you need, and never treat picks or trading as a way to make money. 21+. Gambling problem? Call or text 1-800-GAMBLER. Play responsibly.