Odds Converter
Convert between decimal, fractional and American odds — and see the implied probability behind any price. Type into any box and the rest update instantly.
Common odds at a glance
| Decimal | Fractional | American | Implied probability |
|---|---|---|---|
| 1.20 | 1/5 | -500 | 83.3% |
| 1.50 | 1/2 | -200 | 66.7% |
| 1.91 | 91/100 | -110 | 52.4% |
| 2.00 | 1/1 | +100 | 50.0% |
| 2.50 | 3/2 | +150 | 40.0% |
| 3.00 | 2/1 | +200 | 33.3% |
| 4.00 | 3/1 | +300 | 25.0% |
| 5.00 | 4/1 | +400 | 20.0% |
| 6.00 | 5/1 | +500 | 16.7% |
| 11.00 | 10/1 | +1000 | 9.1% |
| 21.00 | 20/1 | +2000 | 4.8% |
| 51.00 | 50/1 | +5000 | 2.0% |
How each odds format works
Decimal odds show your total return per £1 staked, stake included. A £10 bet at 2.50 returns £25 — £15 profit plus your £10 back. They are the easiest format for comparing prices, which is why odds comparison sites default to them.
Fractional odds show profit only. 3/2 means £3 profit for every £2 staked, so £10 returns £25 — the same price as 2.50 decimal. “Evens” (1/1) is decimal 2.00.
American odds are built around $100. A positive number (+150) is the profit on a $100 stake. A negative number (-110) is what you must stake to profit $100. Anything between -100 and +100 is not a valid price.
What implied probability tells you
Implied probability is simply 1 ÷ decimal odds, expressed as a percentage. Odds of 2.50 imply a 40% chance. It is the quickest way to judge whether a price looks fair: if you believe the real chance is better than the implied figure, the bet has value.
Add up the implied probabilities of every outcome in a market and you will get more than 100%. That excess is the bookmaker's margin — the reason shopping for the best price on each selection matters so much.
Found your price?
The same selection is rarely priced identically everywhere. Compare it across the supported bookmakers before you stake.
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