Paste in a moneyline with its sign and the converter returns the decimal price and the implied probability. Positive numbers become prices above 2.00, negative numbers become prices below it. Decimal is the format most useful once you have it, since total return is stake multiplied by the price with no second step.
Turning a Moneyline Into a Price You Can Stake From
A US pundit quotes a line at +180 and your own bookmaker has the same match at 2.70. Comparing those two numbers in their native formats takes a beat; converting one of them takes a second.
Positive moneylines divide by 100 and add the stake back: (odds ÷ 100) + 1.
Negative moneylines invert first: (100 ÷ absolute value) + 1.
| American | Decimal |
|---|---|
| -250 | 1.40 |
| -150 | 1.67 |
| -110 | 1.91 |
| +110 | 2.10 |
| +180 | 2.80 |
| +260 | 3.60 |
| +400 | 5.00 |
| +750 | 8.50 |
A Worked Example
One line either side of the evens boundary.
- +120: positive, so 120 ÷ 100 = 1.20, then add the stake for 2.20 decimal. A 100 stake returns 220 in total.
- -250: negative, so 100 ÷ 250 = 0.40, then add the stake for 1.40 decimal. Risk 250 to win 100.
Take that second line further. At 1.40 the implied probability is 1 ÷ 1.40 = 71.4%, so the market is asking the favourite to win better than seven times in ten before the price breaks even. The moneyline said the same thing in a form that takes longer to read.
What the Decimal Number Gives You
Multiplication. Total return is stake × decimal price, so 50 at 2.20 returns 110 without any thinking about which side of 100 the bet sits on. Accumulator prices multiply the same way, which is why the Parlay Calculator and every exchange interface work in decimal.
Implied probability is one division: 1 ÷ price. At 2.80 that is 35.7%, and your own estimate against it is the whole of your edge. The Implied Probability Calculator runs that step by itself.
Football bettors work in decimal for both reasons, and the reference table above is worth a bookmark if you read US coverage regularly.
Where the Conversion Loses Precision, and What It Never Fixes
Moneylines are whole numbers, so the decimals they produce often recur. A line of -110 converts to 1.90909, which the table rounds to 1.91. Convert 1.91 back and you get -109.89, not -110. The gap costs pennies on a single bet and matters when you are pricing a series or building a model from scraped US data.
Two moneylines cannot express a decimal price between 1.99 and 2.01, because the format has a hole at evens where -100 and +100 both mean the same bet.
Both of those are small next to what conversion leaves alone. The bookmaker’s margin is baked into the number and arrives in decimal along with everything else. A market showing -110 on both sides looks close to a coin flip and prices at 104.8%, which the Hold / Vig Calculator reports as a 4.6% hold. Strip that margin out with the No-Vig Calculator before you treat any converted price as the market’s honest opinion.
Further Reading
- All betting calculators: the full library of 34 free tools
- Glossary: the terms you will see across Gecko Edge
What is +200 in decimal odds?
+200 converts to 3.00. Divide 200 by 100 to get 2.00 in profit per unit staked, then add 1 for the returned stake. A 50 stake at 3.00 returns 150 in total for 100 profit. The implied probability is 1 ÷ 3.00 = 33.3%.
What is -150 in decimal odds?
-150 converts to 1.67. Divide 100 by 150 to get 0.667 profit per unit staked, then add 1 for the stake. Risking 150 wins 100, for a 250 return. The implied probability is 60%, so the price needs the favourite to win three times in five to break even.
Which is better, American or decimal odds?
Decimal handles arithmetic with fewer steps: total return is stake times price, and accumulator odds multiply. American odds tell you at a glance which side is favoured from the sign alone. Most UK and European books and every betting exchange default to decimal, and US books to American, so bettors reading both usually convert one way and stay there.
Can I change my sportsbook to show decimal odds?
Most books offer an odds format setting in account preferences or in the display options at the top of the betting page. US-facing apps increasingly include decimal and fractional alongside American. Where no setting exists, converting on this page gives the same number the toggle would have shown you.