Convert American, decimal and fractional odds
Converts odds between American, decimal, fractional and implied probability.
Type into any one box. American odds need a sign, e.g. -110 or +150.
The other boxes update to match. Payout and profit are for your stake.
How to use this calculator
- Type a price into any one box: American (with a sign, like -110 or +150), Decimal (like 1.91), Fractional (like 10/11) or Implied probability (%).
- The other three boxes fill in to match.
- Enter your bet in the Stake ($) box to see Total payout (stake included) and Profit.
- Implied probability (%) is the win rate the price assumes: bet at this price many times and you only break even if you win this often.
Example: step by step
- The American box starts at -110: risk $110 to win $100.
- Decimal shows 1.909: 1 + 100 ÷ 110 = 1.909, the total return per $1 staked.
- Fractional shows 10/11: win $10 for every $11 staked.
- Implied probability (%) shows 52.38: 110 ÷ (110 + 100) = 52.38%.
- With Stake ($) at 100: Total payout $100 × 1.909 = $190.91, Profit $90.91.
In plain words: -110, 1.909 and 10/11 are the same price written three ways. A $100 bet at that price wins $90.91, and you need to win more than 52.38% of such bets to come out ahead.
Type a price into any box and the other three update as you type. The converter handles American odds (-110, +250), decimal odds (1.91, 3.50), fractional odds (10/11, 5/2) and implied probability, and shows what your stake would pay. Use the link button to save a conversion or send it to someone.
How the three odds formats work
American odds are built around $100. A minus number is what you have to risk to win $100: at -110 you stake $110 to win $100. A plus number is what a $100 stake wins, so +250 wins $250. Decimal odds include your stake. At 1.91, every $1 returns $1.91 in total, which is $0.91 of profit. Fractional odds show profit against stake: 5/2 wins $5 for every $2 staked, and 10/11 wins $10 for every $11.
All three describe the same thing, the payout on a winning bet, so any price can be written in each style. U.S. sportsbooks default to American odds. Most of Europe, Canada and Australia use decimal, and fractional odds are still common in British and Irish horse racing.
Odds conversion formulas
- American to decimal: for plus odds, divide by 100 and add 1 (+250 becomes 3.50). For minus odds, divide 100 by the number without its sign and add 1 (-110 becomes 1.909).
- Decimal to American: at 2.00 or higher, subtract 1 and multiply by 100 (3.50 becomes +250). Below 2.00, divide -100 by the decimal minus 1 (1.80 becomes -125).
- Fractional to decimal: divide the top number by the bottom one and add 1 (7/4 becomes 2.75).
- Any odds to implied probability: divide 1 by the decimal odds (1 ÷ 1.909 = 52.38%).
- Implied probability to odds: divide 100 by the percentage to get decimal odds (60% becomes 1.667, which is -150).
Worked examples
A standard -110 line
-110 converts to 1.909 in decimal and 10/11 in fractional. The implied probability is 52.38%, and a $100 stake returns $190.91: your $100 back plus $90.91 profit.
An underdog at +250
+250 is 3.50 in decimal and 5/2 in fractional. A $100 bet returns $350, a $250 profit, and the implied probability is 28.57%.
Converting decimal 1.80
A price of 1.80 is -125 in American odds and 4/5 in fractional. The implied probability is 55.56%.
Starting from a probability
If you think a team wins 60% of the time, the fair price is 1.667 in decimal, -150 in American or 2/3 in fractional. Any price longer than that, such as -130, pays more than your estimate says it should.
Implied probability is your break-even rate
The implied probability is the share of bets you need to win just to break even at that price. At -110 you have to win 52.38% of the time to cover your losses. At +250 you only need 28.57%. That makes it the most useful number here when you compare a price with your own view of a game.
Add up both sides of a market and you’ll see the sportsbook’s margin. A game priced at -110 on each side adds up to 104.76%, not 100%, and the extra 4.76% is the vig. Our guide to vig and juice shows how to take it out to find the fair price.
Common odds conversion table
| American | Decimal | Fractional | Implied probability |
|---|---|---|---|
| -500 | 1.20 | 1/5 | 83.33% |
| -300 | 1.33 | 1/3 | 75.00% |
| -200 | 1.50 | 1/2 | 66.67% |
| -150 | 1.67 | 2/3 | 60.00% |
| -125 | 1.80 | 4/5 | 55.56% |
| -120 | 1.83 | 5/6 | 54.55% |
| -110 | 1.91 | 10/11 | 52.38% |
| -105 | 1.95 | 20/21 | 51.22% |
| +100 | 2.00 | 1/1 (evens) | 50.00% |
| +110 | 2.10 | 11/10 | 47.62% |
| +120 | 2.20 | 6/5 | 45.45% |
| +150 | 2.50 | 3/2 | 40.00% |
| +200 | 3.00 | 2/1 | 33.33% |
| +250 | 3.50 | 5/2 | 28.57% |
| +300 | 4.00 | 3/1 | 25.00% |
| +500 | 6.00 | 5/1 | 16.67% |
Why converted odds don’t always match your sportsbook
Books round. Decimal odds are usually shown to two places, so -110 appears as 1.91 rather than 1.909, and fractional odds are often rounded to familiar fractions. On a large stake, that rounding can move a payout by a few cents. This converter keeps the exact value in the background and only rounds what it displays, so converting back and forth doesn’t drift. When the exact fraction would need a very large bottom number, it shows the closest simple fraction instead.
Ready to use a price? Check today’s NFL odds, college football odds or NBA odds, then build a multi-leg ticket with the parlay calculator. For the basics, read how to read betting odds or browse all of our betting guides.
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