Betting Odds Converter
Convert American, decimal, and fractional odds to a win percentage in one place.
Enter odds in any format and the converter shows the rest, including the implied win probability. Use it to compare prices across formats and to see the true percentage a price is asking you to believe.
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How the Odds Converter works
What is a betting odds converter?
A betting odds converter translates a price between the three common formats, American (-110, +150), decimal (1.91, 2.50), and fractional (10/11, 3/2), and shows the implied probability as a percentage. It saves you the mental math when a book quotes one format and you think in another.
How to convert odds to a percentage
Implied probability is the win percentage baked into a price. For positive American odds the formula is 100 / (odds + 100). For negative odds it is odds / (odds + 100). For decimal odds it is simply 1 / decimal. The converter does all of this instantly as you type.
American to decimal, the quick math
For positive American odds, decimal = (odds / 100) + 1, so +150 becomes 2.50. For negative odds, decimal = (100 / |odds|) + 1, so -110 becomes 1.91. Decimal is the easiest format for comparing prices, because a bigger number always means a bigger payout.
Why the implied percentage matters
The implied probability tells you the break-even win rate a bet needs to be profitable. If a price implies 55% but you think the real chance is higher, it is a value bet. This is the first step toward betting with an edge instead of guessing.
Odds conversion chart
Every common American price converted to decimal odds, fractional odds, and the implied win probability (odds to percentage). Favorites (minus) sit at the top, underdogs (plus) below. Type any price into the converter above for a value not listed here.
| American | Decimal | Fractional | Implied probability |
|---|---|---|---|
| -2000 | 1.05 | 1/20 | 95.2% |
| -1000 | 1.10 | 1/10 | 90.9% |
| -500 | 1.20 | 1/5 | 83.3% |
| -400 | 1.25 | 1/4 | 80.0% |
| -300 | 1.33 | 33/100 | 75.0% |
| -250 | 1.40 | 2/5 | 71.4% |
| -200 | 1.50 | 1/2 | 66.7% |
| -175 | 1.57 | 57/100 | 63.6% |
| -150 | 1.67 | 67/100 | 60.0% |
| -140 | 1.71 | 71/100 | 58.3% |
| -130 | 1.77 | 77/100 | 56.5% |
| -125 | 1.80 | 4/5 | 55.6% |
| -120 | 1.83 | 83/100 | 54.5% |
| -115 | 1.87 | 87/100 | 53.5% |
| -110 | 1.91 | 91/100 | 52.4% |
| -105 | 1.95 | 19/20 | 51.2% |
| +100 | 2.00 | 1/1 | 50.0% |
| +105 | 2.05 | 21/20 | 48.8% |
| +110 | 2.10 | 11/10 | 47.6% |
| +115 | 2.15 | 23/20 | 46.5% |
| +120 | 2.20 | 6/5 | 45.5% |
| +125 | 2.25 | 5/4 | 44.4% |
| +130 | 2.30 | 13/10 | 43.5% |
| +140 | 2.40 | 7/5 | 41.7% |
| +150 | 2.50 | 3/2 | 40.0% |
| +175 | 2.75 | 7/4 | 36.4% |
| +200 | 3.00 | 2/1 | 33.3% |
| +250 | 3.50 | 5/2 | 28.6% |
| +300 | 4.00 | 3/1 | 25.0% |
| +400 | 5.00 | 4/1 | 20.0% |
| +500 | 6.00 | 5/1 | 16.7% |
| +750 | 8.50 | 15/2 | 11.8% |
| +1000 | 11.00 | 10/1 | 9.1% |
| +2000 | 21.00 | 20/1 | 4.8% |
The implied probability is the break-even win rate a price is asking you to believe. Anything you can beat is a value bet. Devig two-way markets with the no-vig calculator to compare a price to its fair number.
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Frequently asked questions
How do I convert odds to a percentage?+
Divide to find implied probability: for decimal odds use 1 / decimal; for positive American odds use 100 / (odds + 100); for negative American odds use odds / (odds + 100). The converter does it for you.
What are -110 odds as a percentage?+
-110 American odds imply about a 52.4% chance, which is the classic standard juice on a point spread.
What is +150 in decimal odds?+
+150 American odds equal 2.50 in decimal odds and imply a 40% win probability.
Is this odds converter free?+
Yes. It is free and needs no signup. When you want to actually bet those numbers at a better price, you can do that on BettorEdge.