A $100 bet can appear as 2.00, +100, or -100 depending on the sportsbook. Those figures look unrelated, but they describe the same even-money wager. The difference is the odds format, not the underlying price.
Understanding decimal vs American odds helps you compare markets across international sportsbooks, check potential returns, and spot when two prices are not actually equivalent. The calculations are simple once you know what each number represents.
What decimal odds mean
Decimal odds show the total return for every unit staked, including the original stake. If a bookmaker lists a selection at 2.50, a $10 bet returns $25 if it wins. The net profit is $15, because the original $10 stake is included in the $25 total.
The basic formulas are:
- Total return: stake × decimal odds
- Net profit: stake × (decimal odds − 1)
Decimal betting odds are widely used outside the United States because they make potential payouts easy to compare. A price of 1.50 returns less than 2.00, while 4.00 returns four times the stake. The number itself gives you the full payout multiplier.
What American odds mean
American odds, also called US odds or moneyline odds, use positive and negative numbers around a reference stake of $100.
- Positive American odds: show the profit from a $100 stake. Odds of +250 indicate a $250 profit on $100, plus the returned stake.
- Negative American odds: show how much you must stake to win $100. Odds of -150 require a $150 stake to make a $100 profit, plus the returned stake.
For example, a $20 bet at +250 produces a $50 profit, calculated as $20 × 2.50. A $20 bet at -150 produces a profit of about $13.33, calculated as $20 × 100 ÷ 150. In both cases, the stake is returned separately as part of the total payout.
Decimal vs American odds conversion
Converting odds is useful when comparing a local sportsbook with a US-facing betting site or checking whether a market has been priced consistently.
Convert decimal odds to American odds
For decimal odds of 2.00 or higher, subtract 1 and multiply by 100:
American odds = (decimal odds − 1) × 100
For example, 3.50 becomes:
(3.50 − 1) × 100 = +250
For decimal odds below 2.00, use the negative conversion:
American odds = −100 ÷ (decimal odds − 1)
Therefore, 1.67 converts to approximately -149. Small differences can appear because sportsbooks often round displayed prices.
Convert American odds to decimal odds
For positive odds, divide by 100 and add 1:
Decimal odds = 1 + (American odds ÷ 100)
So +250 becomes 3.50.
For negative odds, divide 100 by the absolute value of the American odds and add 1:
Decimal odds = 1 + (100 ÷ absolute American odds)
Thus, -150 becomes approximately 1.67.
Quick comparison of common odds formats
| Decimal odds | American odds | Implied probability | Profit on $10 |
|---|---|---|---|
| 1.50 | -200 | 66.67% | $5 |
| 1.67 | -149 | 59.88% | $6.70 |
| 2.00 | +100 | 50.00% | $10 |
| 2.50 | +150 | 40.00% | $15 |
| 3.50 | +250 | 28.57% | $25 |
The profit figures exclude the returned $10 stake. For instance, a winning $10 bet at decimal odds of 2.50 returns $25 in total: $15 profit plus the original $10.
How implied probability works
Odds can be expressed as an implied probability, which is the break-even chance suggested by the price before considering a bookmaker’s margin.
For decimal odds:
Implied probability = 1 ÷ decimal odds × 100
For American odds above zero:
Implied probability = 100 ÷ (American odds + 100) × 100
For American odds below zero:
Implied probability = absolute American odds ÷ (absolute American odds + 100) × 100
A price of 2.00 or +100 implies a 50% probability. However, that does not mean the event has exactly a 50% chance of occurring. Sportsbooks build a margin into markets, so the implied probabilities across all outcomes can add up to more than 100%.
Which odds format is easier to use?
Decimal odds are usually clearer for calculating a total payout because one number acts as a direct multiplier. They are especially convenient for accumulators, where multiplying the decimal prices shows the combined return before the stake is applied.
American odds can be more intuitive for bettors accustomed to thinking in terms of a $100 stake or $100 profit. Their positive and negative signs also communicate the broad relationship between the price and the favorite: negative numbers generally identify favorites, while positive numbers generally identify underdogs.
Neither format changes the wager’s risk. A 1.50 decimal price and -200 American odds represent the same approximate return. Focus on the underlying price, market rules, and total payout rather than assuming one display is more favorable.
Common mistakes when comparing betting odds
- Confusing profit with total return: decimal odds include the stake in the displayed payout, while American odds describe either profit or the stake needed for $100 profit.
- Ignoring the minus sign: -120 and +120 are not close alternatives. They describe different prices and different payout calculations.
- Comparing rounded values as exact: a converted price may be shown as a whole number in American format, creating a small rounding difference.
- Forgetting the market margin: implied probability is a pricing measure, not a guarantee or a complete prediction.
- Overlooking market conditions: settlement rules, void policies, limits, and line movement can matter as much as the odds format.
FAQ about decimal and American odds
Are 2.00 decimal odds the same as +100 American odds?
Yes. Both prices represent even money. A $10 winning bet produces $10 in profit and $20 in total return.
What are -110 American odds in decimal format?
-110 converts to approximately 1.91. A $10 bet returns about $19.09 in total, including roughly $9.09 in profit.
What are +200 American odds in decimal format?
+200 converts to 3.00. A $10 bet produces $20 in profit and a $30 total return.
Can I compare odds from different sportsbooks?
Yes, but first convert them to the same format and confirm that the market, selection, rules, and timing match. A different price may reflect line movement rather than a formatting difference.
Before placing a bet
Use the format that makes the payout and risk easiest for you to verify. Check the stake, potential profit, total return, and sportsbook rules before confirming a wager. Betting involves financial risk, so set a budget in advance and never chase losses.