How to convert odds
- Pick the box you knowType into Decimal, Fractional, American or Probability. The other three update as you type.
- Read the returnThe last line shows what a ₦1,000 stake would pay back at that price.
- Copy the format you needFractional prices are reduced to the simplest fraction we can find, such as 6/4 shown as 3/2.
Conversion formulas
| From | To decimal |
|---|---|
| Fractional a/b | a ÷ b + 1. 5/2 becomes 3.50 |
| American +X | X ÷ 100 + 1. +150 becomes 2.50 |
| American -X | 100 ÷ X + 1. -200 becomes 1.50 |
| Probability p% | 100 ÷ p. 40% becomes 2.50 |
Common prices side by side
| Decimal | Fractional | American | Implied chance |
|---|---|---|---|
| 1.25 | 1/4 | -400 | 80.0% |
| 1.50 | 1/2 | -200 | 66.7% |
| 2.00 | 1/1 (evens) | +100 | 50.0% |
| 2.50 | 3/2 | +150 | 40.0% |
| 3.00 | 2/1 | +200 | 33.3% |
| 5.00 | 4/1 | +400 | 20.0% |
| 11.00 | 10/1 | +1000 | 9.1% |
The implied chance still contains the bookmaker's margin. Add up the chances of every outcome in a market and you will get more than 100%. The margin calculator removes it.
Odds converter FAQ
Which odds format do Nigerian bookmakers use?
Decimal odds are the standard on Nigerian betting sites. Fractional prices appear mostly in UK racing and in news, American odds on US sports sites.
Why does my fraction look different from the bookmaker's?
Some decimal prices have no neat fraction. 1.91 is close to 10/11, for example. We show the nearest simple fraction.
What does a minus sign mean in American odds?
A minus shows the favourite: -200 means you stake ₦200 to win ₦100. A plus shows the underdog: +200 means ₦100 wins ₦200.
Is the implied probability the real chance?
No. It is the chance the price suggests, margin included. Your own estimate can be higher or lower; that gap is what the expected value calculator measures.