Decimal to American Odds Converter
Enter a decimal price and the converter returns the American moneyline equivalent plus the implied probability. Prices of 2.00 and above convert to a positive number, prices below 2.00 convert to a negative one. The switch happens at evens because the American system measures everything against a stake or a return of 100.
Why the Conversion Splits at 2.00
A US-facing sportsbook shows Premier League and Champions League markets as moneylines, so a decimal-native bettor comparing prices across a US book and a European one is reading two number systems for the same market. Two formulas cover the whole range.
For 2.00 and above, subtract the stake and scale to 100: (decimal – 1) × 100. A price of 2.50 gives +150.
For anything below 2.00, invert it: -100 ÷ (decimal – 1). A price of 1.80 gives -125.
| Decimal | American |
|---|---|
| 1.25 | -400 |
| 1.44 | -227 |
| 1.62 | -161 |
| 1.95 | -105 |
| 2.20 | +120 |
| 2.85 | +185 |
| 4.20 | +320 |
| 7.00 | +600 |
A Worked Example
Three prices, one either side of evens and one deep favourite.
- 2.50 decimal: above 2.00, so (2.50 – 1) × 100 = +150. A 100 stake wins 150.
- 1.80 decimal: below 2.00, so -100 ÷ (1.80 – 1) = -125. Risk 125 to win 100.
- 1.50 decimal: -100 ÷ (1.50 – 1) = -200. Risk 200 to win 100.
Cross-check the middle row through probability. Divide 1 by 1.80 and the price implies 55.6%, which matches a moneyline of -125: risking 125 to collect 225 in total needs the bet to land 125 ÷ 225 of the time.
Reading a Moneyline Once You Have It
The sign tells you which side of evens the market sits on before you read the digits. A negative number is a favourite, and the further it runs from -100 the shorter the price: -400 is far heavier than -125.
Positive numbers scale the other way. +320 means 320 profit per 100 risked, a decimal price of 4.20 once the stake goes back in.
The Odds / Payout Calculator works from the decimal figure and returns profit on your actual stake rather than on a notional 100.
Rounding, the Evens Gap, and What Stays the Same
American odds print as whole numbers, so most decimal prices do not convert cleanly. A decimal price of 1.44 works out at -227.27 and appears as -227, and 1.95 comes out at -105.26 and shows as -105. Convert those back and the decimal shifts in the third decimal place. On a single bet the difference is small change; across a season of stake calculations it drifts.
Nothing exists between -100 and +100. Both ends of that gap describe a decimal price of 2.00, and a US book will print one or the other rather than a number in between.
The conversion changes the display and leaves the value alone. Bookmaker margin travels with the price into its new format, so a two-way market shown at -110 on both sides carries the same 4.8% overround it had as 1.909 / 1.909 in decimal. The Hold / Vig Calculator puts a figure on that, and the Implied Probability Calculator handles the probability step on its own. Decimal stays the working format for both jobs, because EV arithmetic and exchange ticks run on it.
Further Reading
- All betting calculators: the full library of 34 free tools
- Glossary: the terms you will see across Gecko Edge
What is 2.00 in American odds?
A decimal price of 2.00 is evens, and American odds write it as +100 or -100 depending on the book. Both mean a 100 stake wins 100 profit for a 200 total return. No moneyline number falls between those two values, because the system flips sign at exactly this point.
How do I convert decimal odds to American odds by hand?
Check whether the price is at least 2.00. If it is, subtract 1 and multiply by 100, so 3.40 becomes +240. If it is below 2.00, divide -100 by the decimal price minus 1, so 1.40 becomes -250. Round the result to the nearest whole number, since sportsbooks do not print decimals in moneylines.
Why are American odds negative for favourites?
The format fixes one side of the bet at 100. For a favourite, 100 is what you stand to win, and the negative number states the stake required to win it. For an underdog, 100 is the stake and the positive number states the profit. The sign identifies which side has been pinned.
Does -110 mean the same thing at every sportsbook?
The price does. A moneyline of -110 is a decimal price of 1.909 wherever it appears, implying 52.4%. What differs is the market around it: two sides both priced -110 make a book of 104.8%, while one side at -110 against +105 elsewhere leaves a smaller margin. Compare the pair, not the single number.