Sports
Betting Odds: Decimal Odds and Implied Probability Explained
Summary
- Decimal odds show total return per 1 staked, including the stake.
- Implied probability equals 1 divided by the decimal odds.
- The margin means all outcomes in a market add up to more than 100 percent.
- Odds describe price, not likelihood you can rely on.
- 18+ only
- Official partner site
- Verified 5 Nov 2026
- Limits before play
Odds are a compact way of stating a price, and once you can convert them to a probability the whole sportsbook becomes easier to read. This page works through decimal odds, which are the format most Bangladeshi sites display, with numbers you can repeat on any slip. We do not state GT99 odds; use the slip in your account. Everything here is arithmetic, not advice.
Decimal odds in one line
A decimal price tells you the total you get back for each 1 staked, stake included. At 2.50, a 100 stake returns 250 if it wins, which is a profit of 150. At 1.50, a 100 stake returns 150, a profit of 50. A larger number means the market rates the result as less probable.
Converting to implied probability
Divide 1 by the decimal odds. The result is the chance the price implies.
| Decimal odds | Calculation | Implied probability |
|---|---|---|
| 1.50 | 1 divided by 1.50 | About 66.7 percent |
| 2.00 | 1 divided by 2.00 | 50 percent |
| 2.50 | 1 divided by 2.50 | 40 percent |
| 4.00 | 1 divided by 4.00 | 25 percent |
The margin and why it matters
In a fair two-way market the two probabilities would add to 100 percent. In practice a book prices both sides slightly shorter, so they add to more, for example 2.00 and 2.00 gives exactly 100 while 1.91 and 1.91 gives about 104.7 percent. The extra 4.7 percent is the margin, and it is the book's built-in edge.
Over many bets the margin is a cost. It is the reason that betting does not reward volume, and the reason to place fewer, considered bets rather than many.
Using the numbers sensibly
Compare the implied probability with your own honest estimate; if you cannot estimate, you have no reason to bet. A price is not a forecast, and a short price still loses sometimes. Accumulator odds multiply: three selections at 2.00 give 8.00, but the chance of all three winning is 12.5 percent at fair prices.
For market structure, see the sports betting hub; for cricket pricing, see cricket odds; and for how short runs mislead, read about variance.
In practice, writing the implied probability next to each price before staking makes the comparison between markets far more exact.
Procedure
Read a price in 3 steps
- 1Take the decimal odds
Read the price on the slip.
- 2Convert to a percentage
Divide 1 by the odds and multiply by 100.
- 3Compare with your view
Bet only if you have a reasoned view and the stake fits your limit.