Calculators
Odds Converter: Decimal, Fractional, American and Probability
Nigerian bookmakers show decimal odds, but tipsters, UK sites and American apps use other formats. Type odds in any box and the converter fills in the rest, including the implied probability.
Table of contents
The Three Odds Formats
| Format | Example | Read it as |
|---|---|---|
| Decimal | 2.50 | Every ₦1 staked returns ₦2.50, stake included |
| Fractional | 3/2 | Win ₦3 profit for every ₦2 staked |
| American | +150 / -200 | +150: win ₦150 on ₦100. -200: stake ₦200 to win ₦100 |
Conversion Formulas
- Fractional to decimal: top divided by bottom, plus 1. 3/2 = 1.5 + 1 = 2.50.
- Positive American to decimal: divide by 100, plus 1. +150 = 2.50.
- Negative American to decimal: 100 divided by the number without the minus, plus 1. -200 = 1.50.
- Decimal to probability: 1 divided by the odds, times 100. 2.50 = 40%.
Using Implied Probability
If you think a team wins 50% of the time but the odds imply 40%, the price may be value. If you think it is 35%, skip it. Adding up the implied probabilities of all outcomes also shows the bookmaker's margin; see highest odds betting sites.
Implied probability includes the bookmaker's margin, so the true chance is a little lower than the number shown.
Odds Converter FAQ
What odds do Nigerian bookmakers use?
Decimal odds, such as 1.85 or 3.40.
What does 5/1 mean in decimal?
6.00. Divide 5 by 1 and add 1.
What does -110 mean?
Stake ₦110 to win ₦100 profit, or decimal odds of about 1.91.