Different bookmakers use different odds formats. If you normally bet with decimal odds (common across Europe, Australia, and most betting exchanges) but want to place a wager at a UK racecourse or high-street bookmaker, you will need to convert those decimals into fractional odds.
The difference is straightforward: decimal odds show your total return (stake + profit), while fractional odds show only the profit ratio relative to your stake. For example, decimal 2.50 means you receive £2.50 for every £1 wagered — which in fractional terms is 6/4 (£6 profit for every £4 staked).
Use this free converter to translate any decimal price into its fractional equivalent. The calculator also shows implied probability, American odds, and payout examples so you can compare across formats at a glance.
Decimal to Fractional
Live ConverterHow to Convert Decimal to Fractional Odds
profit = decimal − 1Standard Bookmaker Odds — Quick Reference
Click any row to load it into the calculator. These are the fractions UK bookmakers actually use.
| Decimal | Fractional | American | Probability |
|---|
How to Use the Calculator
Enter any decimal odds value into the input field, and the tool will instantly return:
- Fractional odds — the simplified UK fraction (e.g., 1.50 → 1/2). If the result matches a standard bookmaker fraction, you will see a confirmation; otherwise, the nearest standard fraction is shown for reference.
- Implied probability — the percentage chance the odds represent (e.g., 2.00 = 50%). This helps you assess whether the bookmaker’s price reflects fair value compared to your own estimate of the outcome.
- American (moneyline) odds — useful if you also bet with US-based sportsbooks or want to compare across formats.
- Payout examples — see your total return and profit for stakes of £10, £50, and £100 without any manual calculation.
You can also click any row in the reference table below the calculator to load that value automatically.
Decimal to Fractional Conversion — Step by Step
The conversion formula is simple in principle, but rounding and simplification can be tricky in practice. Here is how to do it manually:
Step 1 — Subtract 1 from the decimal. This isolates the profit component. Decimal odds include your original stake, so removing it gives the profit per unit staked. For example: 3.75 − 1 = 2.75.
Step 2 — Express the result as a fraction. Write the profit over 1 (i.e. 2.75/1), then multiply both numerator and denominator by 100 to remove the decimal point: 275/100.
Step 3 — Simplify. Divide both sides by the greatest common divisor. GCD(275, 100) = 25, so the result is 275 ÷ 25 / 100 ÷ 25 = 11/4.
The formula works for any decimal value, but some results may produce fractions that bookmakers do not typically display (see the next section).
Standard vs. Mathematical Fractions
An important point that many converters fail to explain: UK bookmakers only use a fixed set of fractions. Traditional racing and high-street odds are drawn from a specific ladder that includes values like 1/5, 2/7, 1/2, 4/6, 5/4, 6/4, 7/4, 2/1, 9/4, 5/2, 3/1, and so on.
When you convert a precise decimal — for example, 1.95 — the mathematically correct fraction is 19/20. However, no UK bookmaker uses 19/20. The closest standard fraction is 10/11 (decimal 1.909) or Evs (decimal 2.00). These are different prices with different payouts — 10/11 is not simply “another way to write 1.95.”
Our calculator handles this by giving you the exact mathematical fraction and flagging whether it matches a standard bookmaker fraction. If it does not, it shows the nearest standard equivalent so you know what price to expect on a UK bookie’s board.
This distinction matters for value betting: if you see decimal 1.95 on a European exchange and 10/11 at a UK bookmaker, these are genuinely different odds (implied probabilities of 51.3% vs. 52.4%), not the same price in two formats.
When to Use This Converter
This tool is most useful in the following situations:
UK horse racing. Prices at racecourses and in traditional racing media (Racing Post, At The Races) are displayed as fractions. If your analysis or tipster service quotes decimal odds, converting to fractions lets you quickly find the matching price on the UK boards.
Comparing exchange and bookmaker prices. Betting exchanges like Betfair use decimal odds with precise increments (e.g., 2.38). Converting to the nearest fractional equivalent helps you compare with traditional bookmakers. For a full odds format comparison, see our universal odds converter.
Understanding payouts at a glance. Some bettors find fractions more intuitive for gauging profit. Seeing “7/4” immediately tells you: bet 4, profit 7. The equivalent decimal (2.75) requires subtraction to reach the same conclusion.
For the reverse conversion — fractional to decimal — or for checking the bookmaker’s margin embedded in the odds, use our dedicated tools.
Decimal to Fractional Odds Conversion Table
The table below lists all standard UK bookmaker fractions alongside their decimal and American equivalents. This covers the full ladder from heavy odds-on (1/12) to longshots (100/1). Click any row to load it into the calculator above.
Note: This table is also built into the calculator widget. Use the filter buttons (Odds-On, Odds-Against, Longshots) to narrow the view.
| Decimal | Fractional | American | Implied Probability |
|---|---|---|---|
| 1.08 | 1/12 | -1200 | 92.6% |
| 1.10 | 1/10 | -1000 | 90.9% |
| 1.12 | 1/8 | -800 | 88.9% |
| 1.14 | 1/7 | -714 | 87.7% |
| 1.17 | 1/6 | -600 | 85.7% |
| 1.20 | 1/5 | -500 | 83.3% |
| 1.22 | 2/9 | -450 | 81.8% |
| 1.25 | 1/4 | -400 | 80.0% |
| 1.29 | 2/7 | -350 | 77.8% |
| 1.30 | 3/10 | -333 | 76.9% |
| 1.33 | 1/3 | -300 | 75.0% |
| 1.36 | 4/11 | -275 | 73.3% |
| 1.40 | 2/5 | -250 | 71.4% |
| 1.44 | 4/9 | -225 | 69.2% |
| 1.50 | 1/2 | -200 | 66.7% |
| 1.53 | 8/15 | -188 | 65.2% |
| 1.57 | 4/7 | -175 | 63.6% |
| 1.62 | 8/13 | -163 | 61.5% |
| 1.67 | 4/6 | -150 | 60.0% |
| 1.73 | 8/11 | -138 | 57.9% |
| 1.80 | 4/5 | -125 | 55.6% |
| 1.83 | 5/6 | -120 | 54.5% |
| 1.91 | 10/11 | -110 | 52.4% |
| 2.00 | Evens (1/1) | +100 | 50.0% |
| 2.10 | 11/10 | +110 | 47.6% |
| 2.20 | 6/5 | +120 | 45.5% |
| 2.25 | 5/4 | +125 | 44.4% |
| 2.38 | 11/8 | +138 | 42.0% |
| 2.50 | 6/4 | +150 | 40.0% |
| 2.63 | 13/8 | +163 | 38.0% |
| 2.75 | 7/4 | +175 | 36.4% |
| 2.88 | 15/8 | +188 | 34.7% |
| 3.00 | 2/1 | +200 | 33.3% |
| 3.50 | 5/2 | +250 | 28.6% |
| 4.00 | 3/1 | +300 | 25.0% |
| 5.00 | 4/1 | +400 | 20.0% |
| 6.00 | 5/1 | +500 | 16.7% |
| 7.00 | 6/1 | +600 | 14.3% |
| 10.00 | 9/1 | +900 | 10.0% |
| 11.00 | 10/1 | +1000 | 9.1% |
| 21.00 | 20/1 | +2000 | 4.8% |
| 34.00 | 33/1 | +3300 | 2.9% |
| 51.00 | 50/1 | +5000 | 2.0% |
| 101.00 | 100/1 | +10000 | 1.0% |
Common Conversion Mistakes
Forgetting to subtract 1. The most frequent error. Decimal 3.00 is not 3/1 in fractional form because you forgot — wait, actually it is. Decimal 3.00 minus 1 = 2, and 2/1 is indeed the standard way to write this. But decimal 2.00 is not 2/1 — it is 1/1 (Evens). The mistake usually surfaces with numbers close to whole values.
Not simplifying the fraction. Decimal 1.50 gives a profit of 0.50, which is 50/100. Without simplification, that looks wrong. Reduced to lowest terms, it becomes 1/2.
Confusing mathematical and bookmaker fractions. As explained above, a decimal of 2.38 converts mathematically to 69/50. But no bookmaker offers 69/50 — the nearest standard fraction is 11/8 (2.375). Our calculator flags this automatically.