Fractional odds are the traditional format for UK and Irish betting markets, especially horse racing. Prices such as 5/2, 10/11, evens, and 1/2 show profit as a ratio of stake.
Decimal odds show the total return multiplier, including the original stake. This makes them easier for payout calculations, betting exchanges, accumulators, and probability work.
This Fractional to Decimal Odds Converter turns a UK-style ratio price into decimal format. It also shows the American moneyline equivalent, break-even probability, profit, and total return for your stake.
Quick examples: 1/2 converts to 1.50, 10/11 converts to about 1.91, evens converts to 2.00, 5/2 converts to 3.50, and 4/1 converts to 5.00.
Fractional to Decimal Odds Converter
Convert UK-style odds into decimal, moneyline, probability, profit and return.
How to Use the Converter
- Enter the fractional price: type odds such as 5/2, 10/11, 1/2, or evens.
- Add your stake: the calculator shows profit and total return for that stake.
- Read the decimal result: decimal odds show total return per 1 unit staked.
- Check the extras: the tool also shows American odds and break-even probability.
Fractional to Decimal Formula
The formula is:
Decimal Odds = (Numerator ÷ Denominator) + 1
The fraction gives the profit part. The added 1 represents the returned stake.
| Fractional price | Calculation | Decimal result | Meaning |
|---|---|---|---|
| 1/2 | (1 ÷ 2) + 1 | 1.50 | 1 unit profit for every 2 units staked |
| 10/11 | (10 ÷ 11) + 1 | 1.91 | Common spread-style price |
| 1/1 / evens | (1 ÷ 1) + 1 | 2.00 | Profit equals stake |
| 5/2 | (5 ÷ 2) + 1 | 3.50 | 5 units profit for every 2 units staked |
Worked Example: Convert 5/2 to Decimal
A price of 5/2 means 5 units of profit for every 2 units staked.
Decimal odds = (5 ÷ 2) + 1 = 3.50
A 100-unit winning bet at 3.50 returns 350 units total: 250 units profit plus the original 100-unit stake.
Worked Example: Convert 10/11 to Decimal
A price of 10/11 means 10 units of profit for every 11 units staked.
Decimal odds = (10 ÷ 11) + 1 = 1.91
This is close to the common US -110 spread or total price.
Common Conversion Table
| Fractional odds | Decimal odds | American odds | Break-even probability | Plain meaning |
|---|---|---|---|---|
| 1/5 | 1.20 | -500 | 83.33% | Heavy favorite |
| 1/2 | 1.50 | -200 | 66.67% | Strong favorite |
| 2/3 | 1.67 | -150 | 60.00% | Favorite |
| 10/11 | 1.91 | -110 | 52.38% | Common spread or total price |
| Evens / 1/1 | 2.00 | +100 | 50.00% | Even money |
| 3/2 | 2.50 | +150 | 40.00% | Moderate underdog |
| 2/1 | 3.00 | +200 | 33.33% | Underdog |
| 5/2 | 3.50 | +250 | 28.57% | Larger underdog |
| 4/1 | 5.00 | +400 | 20.00% | Longer price |
| 10/1 | 11.00 | +1000 | 9.09% | Long shot |
Fractional vs Decimal Odds
Both formats describe the same underlying betting price. The difference is what they display.
| Format | What it shows | Example |
|---|---|---|
| Fractional | Profit as a ratio of stake. | 5/2 means 5 units profit for every 2 units staked. |
| Decimal | Total return multiplier, including stake. | 3.50 means 3.5 units returned per 1 unit staked. |
| American / moneyline | Profit on 100 units or stake needed to win 100 units. | +250 means 250 units profit on a 100-unit winning bet. |
Why Convert to Decimal Format?
- Payout calculations: total return is simply stake × decimal odds.
- Accumulators and parlays: decimal prices can be multiplied across legs.
- Betting exchanges: exchanges usually display decimal odds.
- Line shopping: converting formats makes it easier to compare prices across sportsbooks.
- Probability calculations: break-even chance is easy to calculate from decimal odds: 1 ÷ odds.
Important Limitation
This converter only changes the odds display format. It does not tell you whether the 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
How do you convert fractional odds to decimal odds?
Divide the numerator by the denominator, then add 1. For example, 5/2 becomes (5 ÷ 2) + 1 = 3.50.
What is 1/2 in decimal odds?
1/2 converts to 1.50. This means a winning bet returns 1.5 times the stake, including the original stake.
What is 2/1 in decimal odds?
2/1 converts to 3.00. A 1-unit winning bet returns 3 units total: 2 units profit plus the original stake.
What is evens in decimal odds?
Evens, also written as 1/1, converts to 2.00. The profit equals the stake.
Are decimal odds better than fractional odds?
Decimal format is usually easier for total return, probability, and parlay calculations. Fractional format is useful for seeing profit as a ratio of stake. Neither format changes the underlying value.