American odds (also called moneyline odds) are the standard format at US sportsbooks. They use positive and negative numbers centered around 100: a positive number like +200 tells you the profit on a $100 stake, while a negative number like -150 tells you how much you need to risk to win $100.
Decimal odds are simpler — they represent the total payout per $1 wagered, including your stake. This makes them the preferred format on betting exchanges, European sportsbooks, and for any calculation involving parlays or accumulators, where you need to multiply odds across multiple legs.
Enter your American odds below to convert them to decimal format instantly.
American → Decimal Converter
The Conversion Formulas
There are two formulas, one for each type of American odds:
For positive American odds (+150, +200, etc.):
Decimal Odds = (American Odds ÷ 100) + 1
Example: +150 → (150 ÷ 100) + 1 = 2.50
For negative American odds (-110, -200, etc.):
Decimal Odds = (100 ÷ |American Odds|) + 1
Example: -150 → (100 ÷ 150) + 1 = 1.667
The key difference is the direction of the division. Positive odds divide the odds by 100; negative odds divide 100 by the odds. In both cases, you add 1 at the end because decimal odds include the return of your original stake.
Once you have the decimal number, calculating your payout is straightforward: multiply it by your stake. A $50 bet at decimal odds of 2.50 returns $125 total ($75 profit + $50 stake).
Quick Reference Table
This chart covers the most common American odds you will encounter at US sportsbooks, along with their decimal equivalents and implied probabilities.
| American Odds | Decimal Odds | Implied Probability |
|---|---|---|
| -500 | 1.20 | 83.3% |
| -400 | 1.25 | 80.0% |
| -300 | 1.33 | 75.0% |
| -250 | 1.40 | 71.4% |
| -200 | 1.50 | 66.7% |
| -150 | 1.67 | 60.0% |
| -130 | 1.77 | 56.5% |
| -120 | 1.83 | 54.5% |
| -110 | 1.91 | 52.4% |
| -105 | 1.95 | 51.2% |
| +100 | 2.00 | 50.0% |
| +105 | 2.05 | 48.8% |
| +110 | 2.10 | 47.6% |
| +120 | 2.20 | 45.5% |
| +130 | 2.30 | 43.5% |
| +150 | 2.50 | 40.0% |
| +200 | 3.00 | 33.3% |
| +250 | 3.50 | 28.6% |
| +300 | 4.00 | 25.0% |
| +400 | 5.00 | 20.0% |
| +500 | 6.00 | 16.7% |
| +1000 | 11.00 | 9.1% |
Notice the pattern: -110 (the standard US spread/total line) converts to 1.91 in decimal. This is one of the most frequently needed conversions, and the 0.09 gap from 2.00 represents the sportsbook’s built-in margin (vig).
Why Convert American Odds to Decimal?
Simpler payout math. With decimal odds, your total return is always stake × odds — one multiplication. With American odds, you need different formulas depending on whether the number is positive or negative, and the result gives you profit rather than total return.
Parlay and accumulator calculations. To find the combined odds of a parlay, you multiply the decimal odds of each leg together. This is not possible with American odds without converting first. If you are building multi-leg bets, decimals are essential. See our Accumulator Odds Calculator for a dedicated tool.
Exchange compatibility. Betting exchanges like Betfair, Smarkets, and Matchbook use decimal odds exclusively. If you are transitioning from a US sportsbook to an exchange, you need to be comfortable reading decimal prices.
Comparing odds across bookmakers. When you are line shopping between a US sportsbook showing -115 and a European book showing 1.87, a quick conversion tells you they are essentially the same price. Without converting, you cannot compare efficiently.
Common Conversions Explained
What is -110 in decimal? The standard US vig line of -110 converts to 1.91. This is the price you see on most point spreads and totals. If both sides of a market are priced at -110, the sportsbook is operating at a combined implied probability of 104.8% — the 4.8% excess is the vig.
What is +100 in decimal? Even money. +100 converts to 2.00, meaning you double your stake on a win. This is the dividing line between favorites and underdogs in decimal format: anything below 2.00 is a favorite, anything above is an underdog.
What is -200 in decimal? A heavy favorite at -200 converts to 1.50. You risk $200 to win $100 profit, or equivalently, a $100 bet returns $150 total.