American odds, also called moneyline odds, are built around a 100-unit baseline. A positive price such as +200 shows profit on a 100-unit winning bet. A negative price such as -150 shows how much must be risked to win 100 units of profit.
Fractional odds show the same price as a profit-to-stake ratio. For example, 2/1 means 2 units of profit for every 1 unit staked, while 4/6 means 4 units of profit for every 6 units staked.
This American to Fractional Odds Converter turns US moneyline prices into UK-style fractional odds. It also shows the decimal equivalent, break-even probability, profit, and total return for your stake.
Quick examples: -200 converts to 1/2, -110 converts to about 10/11, +100 converts to evens, +150 converts to 3/2, and +300 converts to 3/1.
American to Fractional Odds Converter
Convert moneyline odds into UK fractions, decimal odds, probability, profit and return.
How to Use the Converter
- Enter American odds: type a moneyline price such as -110, +150, -200, or +300.
- Add your stake: the calculator shows profit and total return for that stake.
- Read the UK fraction: this is the same price written as a profit-to-stake ratio.
- Check the extras: the tool also shows decimal odds and break-even probability.
Moneyline to Fractional Formula
The formula depends on whether the American price is positive or negative.
| American price | Type | Formula | Example |
|---|---|---|---|
| Positive, such as +300 | Underdog / plus-money price | American ÷ 100, then simplify | +300 → 300/100 → 3/1 |
| +100 | Even money | 100/100 | +100 → 1/1 or evens |
| Negative, such as -200 | Favorite / minus-money price | 100 ÷ absolute American odds, then simplify | -200 → 100/200 → 1/2 |
Common Conversion Table
| American odds | Fractional odds | Decimal odds | Break-even probability | Plain meaning |
|---|---|---|---|---|
| -500 | 1/5 | 1.20 | 83.33% | Heavy favorite |
| -200 | 1/2 | 1.50 | 66.67% | Strong favorite |
| -150 | 2/3 | 1.67 | 60.00% | Favorite |
| -110 | 10/11 | 1.91 | 52.38% | Common spread or total price |
| +100 | Evens / 1/1 | 2.00 | 50.00% | Even money |
| +150 | 3/2 | 2.50 | 40.00% | Moderate underdog |
| +200 | 2/1 | 3.00 | 33.33% | Underdog |
| +300 | 3/1 | 4.00 | 25.00% | Larger underdog |
| +400 | 4/1 | 5.00 | 20.00% | Longer price |
| +1000 | 10/1 | 11.00 | 9.09% | Long shot |
Worked Example: Convert -110 to Fractional Odds
A moneyline price of -110 means you must risk 110 units to win 100 units of profit.
The ratio is:
100/110
Simplify the fraction:
100/110 = 10/11
So -110 converts to 10/11. This is an odds-on price because the stake is slightly larger than the profit.
Worked Example: Convert +150 to Fractional Odds
A moneyline price of +150 means a 100-unit winning bet makes 150 units of profit.
The ratio is:
150/100
Simplify the fraction:
150/100 = 3/2
So +150 converts to 3/2. This means 3 units of profit for every 2 units staked.
American vs Fractional Odds
Both formats describe the same underlying betting price. The difference is how the profit is displayed.
| Format | What it shows | Example |
|---|---|---|
| American / moneyline | Profit on 100 units or stake needed to win 100 units. | +150 means 150 units profit on a 100-unit winning bet. |
| Fractional | Profit as a ratio of stake. | 3/2 means 3 units profit for every 2 units staked. |
| Decimal | Total return multiplier, including stake. | 2.50 means 2.5 units returned per 1 unit staked. |
Why Convert Moneyline Odds to UK Fractions?
- UK sportsbook comparison: traditional British bookmakers and racing boards often use fractions.
- Profit-ratio reading: a fraction quickly shows how much profit is paid relative to stake.
- Cross-market line shopping: conversion makes it easier to compare US and UK prices.
- Horse racing and racing media: many cards, previews, and odds boards still quote ratios.
Important Limitation
This converter only changes the odds display format. It does not tell you whether a bet has value. To judge value, compare the break-even probability from the price with your own estimate of the outcome’s real chance.
Frequently Asked Questions
What is -110 in fractional odds?
-110 converts to 10/11. This is an odds-on price where the stake is slightly higher than the potential profit.
What is +150 in fractional odds?
+150 converts to 3/2. This means 3 units of profit for every 2 units staked.
How do you convert positive American odds to a fraction?
Put the American odds over 100 and simplify. For example, +300 becomes 300/100 = 3/1.
How do you convert negative American odds to a fraction?
Put 100 over the absolute value of the American odds and simplify. For example, -200 becomes 100/200 = 1/2.
Are fractional odds only used for horse racing?
No. They are most visible in UK and Irish horse racing, but they are also used across other sports by some traditional bookmakers and racing media.