Decimal odds to fractional odds
Type a value in decimal to get it in fractional instantly.
That's 612× as likely as being struck by lightning in a year, while rolling a six is 4.2× more likely. That is roughly one in 25.
Convert the other way: fractional to decimal
What it means
How likely is that?
These are pure mathematical conversions. Published betting odds include a bookmaker’s margin, so they always add to more than 100%.
The math
How to convert decimal to fractional
Every format is the same chance written differently: probability = 1 ÷ decimal odds, fractional = decimal − 1, and American odds are +100 × (1 − p) ÷ p for an underdog or −100 × p ÷ (1 − p) for a favorite.
Example: 25 decimal = 24 fractional.
Every unit
Your chance in every format
Tables
decimal to fractional conversion table
| decimal | fractional |
|---|---|
| 1 decimal | 0 fractional |
| 2 decimal | 1 fractional |
| 5 decimal | 4 fractional |
| 10 decimal | 9 fractional |
| 20 decimal | 19 fractional |
| 25 decimal | 24 fractional |
| 33 decimal | 32 fractional |
| 40 decimal | 39 fractional |
| 50 decimal | 49 fractional |
| 60 decimal | 59 fractional |
| 75 decimal | 74 fractional |
| 90 decimal | 89 fractional |
| 95 decimal | 94 fractional |
fractional to decimal conversion table
| fractional | decimal |
|---|---|
| 1 fractional | 2 decimal |
| 2 fractional | 3 decimal |
| 5 fractional | 6 decimal |
| 10 fractional | 11 decimal |
| 20 fractional | 21 decimal |
| 25 fractional | 26 decimal |
| 33 fractional | 34 decimal |
| 40 fractional | 41 decimal |
| 50 fractional | 51 decimal |
| 60 fractional | 61 decimal |
| 75 fractional | 76 decimal |
| 90 fractional | 91 decimal |
| 95 fractional | 96 decimal |
Quick answers
Quick answers
- How many fractional is 1 decimal?
- 1 decimal is 0 fractional.
- How many fractional is 10 decimal?
- 10 decimal is 9 fractional.
- How many fractional is 25 decimal?
- 25 decimal is 24 fractional.
The units
About these units
Decimal odds (decimal)
The European format: total return per unit staked, stake included.
Fractional odds (fractional)
The British format: profit against stake, so 3 means 3/1.
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