Odds Converter
Racing odds come in all shapes and sizes. The traditional UK fractional format is fine if you grew up with it, but if you are comparing prices across exchanges and international bookmakers, you will need to switch between formats quickly. Type any odds below and the other formats update instantly.
Common Racing Odds Reference
| Fractional | Decimal | American | Implied Probability | Description |
|---|---|---|---|---|
| 1/5 | 1.20 | -500 | 83.3% | Odds on, heavy favourite |
| 1/3 | 1.33 | -300 | 75.0% | Strong favourite |
| 4/7 | 1.57 | -175 | 63.6% | Favourite |
| 4/5 | 1.80 | -125 | 55.6% | Short price |
| Evens | 2.00 | +100 | 50.0% | Even money |
| 6/4 | 2.50 | +150 | 40.0% | Just against |
| 2/1 | 3.00 | +200 | 33.3% | Solid chance |
| 9/4 | 3.25 | +225 | 30.8% | Decent price |
| 4/1 | 5.00 | +400 | 20.0% | Outside chance |
| 8/1 | 9.00 | +800 | 11.1% | Longer shot |
| 14/1 | 15.00 | +1400 | 6.7% | Big price |
| 25/1 | 26.00 | +2500 | 3.8% | Outsider |
| 50/1 | 51.00 | +5000 | 2.0% | Rank outsider |
| 100/1 | 101.00 | +10000 | 1.0% | Three-figure price |
Why Understanding Odds Formats Matters
If you only ever bet with one bookmaker in one country, odds formats might seem like a trivial detail. But the moment you start comparing prices across multiple firms, or looking at exchange markets where decimal is the standard, or following American tipsters on social media, the ability to convert quickly becomes essential.
Fractional odds are the traditional UK format. An odds of 9/4 means for every £4 you stake, you win £9 profit (plus your stake back). They are wonderfully intuitive once you have grown up with them, but they can be awkward for quick mental arithmetic, especially at prices like 11/8 or 100/30.
Decimal odds are the global standard, used by virtually every betting exchange and most European bookmakers. They represent the total return on a £1 stake, including the stake itself. So 3.25 in decimal is the same as 9/4 in fractional. Many experienced punters prefer decimal because comparison is instant: 3.25 is clearly better than 3.10, whereas spotting that 9/4 is better than 21/10 takes a moment longer.
American odds use a positive/negative system centred on $100. A positive number (like +225) tells you the profit on a $100 stake. A negative number (like -175) tells you how much you need to stake to win $100. It is a format designed for the US market and you will encounter it if you follow American horse racing or sports betting.
Implied probability is perhaps the most important number of all. It tells you what chance the odds suggest a horse has of winning. If the implied probability is 30% but your form analysis says the horse has a 40% chance, you have found value. That gap between market probability and your assessed probability is where long-term profit lives. It is the single most important concept in betting mathematics, and this tool makes it visible at a glance.