If you follow a UK tipster or bet on European horse racing, you will often see prices such as 4/1, evens, 10/11, or 1/2. For a US bettor, those ratios do not immediately show the familiar moneyline number.
This Fractional to American Odds Converter turns UK-style prices into US moneyline odds. It also shows the decimal equivalent, break-even probability, profit, and total return for your stake.
Quick examples: 4/1 converts to +400, 5/2 converts to +250, 10/11 converts to about -110, and 1/2 converts to -200.
Fractional to American Odds Converter
Convert UK-style odds into moneyline, decimal, probability, profit and total return.
How to Use the Converter
The tool translates a profit-to-stake ratio into the American plus/minus system. Enter a price such as 5/2, 10/11, evens, or a whole number such as 5 for 5/1.
- Enter the ratio price: type the odds shown by the bookmaker, racecard, or tipster.
- Add your stake: the calculator shows profit and total return for that stake.
- Read the moneyline result: positive odds show profit on a 100-unit stake; negative odds show how much must be risked to win 100 units.
- Check break-even probability: this is the win rate required before removing bookmaker margin.
How the Conversion Works
Fractional odds show profit relative to stake. For example, 5/2 means you win 5 units of profit for every 2 units staked. Your original stake is returned separately if the bet wins.
| Type | Example | Calculation | Moneyline result |
|---|---|---|---|
| Odds against | 5/2 | (5 ÷ 2) × 100 | +250 |
| Evens | 1/1 | Profit equals stake | +100 |
| Odds on | 1/2 | -(2 ÷ 1) × 100 | -200 |
| Standard spread-style price | 10/11 | -(11 ÷ 10) × 100 | -110 |
Common Conversion Table
| Fractional price | Moneyline | Decimal | Break-even probability | Plain meaning |
|---|---|---|---|---|
| 1/2 | -200 | 1.50 | 66.67% | Strong favorite |
| 10/11 | -110 | 1.91 | 52.38% | Common spread or total price |
| Evens / 1/1 | +100 | 2.00 | 50.00% | Even money |
| 5/2 | +250 | 3.50 | 28.57% | Moderate underdog |
| 4/1 | +400 | 5.00 | 20.00% | Larger underdog |
Worked Example: 10/11 to Moneyline
A price of 10/11 means you win 10 units of profit for every 11 units staked. Because the denominator is larger than the numerator, this is an odds-on price and converts to a negative moneyline.
Moneyline = -(11 ÷ 10) × 100 = -110
The decimal equivalent is:
1 + (10 ÷ 11) = 1.91
The break-even probability is:
11 ÷ (10 + 11) × 100 = 52.38%
Worked Example: 5/2 to Moneyline
A price of 5/2 means you win 5 units of profit for every 2 units staked. Because the numerator is larger than the denominator, this is an odds-against price and converts to a positive moneyline.
Moneyline = (5 ÷ 2) × 100 = +250
The decimal equivalent is:
1 + (5 ÷ 2) = 3.50
The break-even probability is:
2 ÷ (5 + 2) × 100 = 28.57%
Fractional vs Moneyline vs Decimal
These are only different ways to display the same underlying betting price. The format does not change the payout or make a bet better.
| Format | Best for | Example |
|---|---|---|
| Fractional | Reading profit as a ratio of stake | 4/1 means 4 units profit for every 1 unit staked |
| American / moneyline | Seeing profit or required stake in 100-unit terms | +400 means 400 units profit on a 100-unit winning bet |
| Decimal | Calculating total return and probability | 5.00 means 5 units total return per 1 unit staked |
Important Limitation
This converter does not tell you whether a bet is profitable. It only changes the odds display format. To judge betting value, compare the break-even probability from the odds with your own estimate of the outcome’s real chance.
Frequently Asked Questions
What is evens in American odds?
In fractional format, evens is 1/1. In American odds, this is +100. It means your profit equals your stake.
How do I convert 10/11 manually?
Divide the denominator by the numerator and multiply by -100. The calculation is -(11 ÷ 10) × 100 = -110.
What is 4/1 in American odds?
4/1 converts to +400. A 100-unit winning bet would make 400 units of profit, plus the original stake.
Which format is easier to use?
It depends on the market. Fractional odds are common in UK racing, American odds are common at US sportsbooks, and decimal odds are usually easiest for total return and probability calculations.
Does break-even probability include sportsbook margin?
The probability from one price is the break-even point for that price. In a full market, all outcomes usually add up to more than 100% because the sportsbook includes margin.