Understanding sports odds and choosing between single and accumulator bets

Before placing a bet you need to know how to read odds. They are the number that tells you how much you can win and, indirectly, how likely the bookmaker considers the outcome.

What odds represent

Odds reflect the probability of an event happening, as estimated by the bookmaker, and determine how much you can win. Low odds (close to 1) mean the outcome is considered very likely; high odds mean the opposite, with a bigger potential win if it happens.

The three odds formats

Three formats exist depending on the region of the world. They all express the same information, just presented differently:

• Decimal (the most common): for example 1.90.
• Fractional (used in the United Kingdom): for example 9/10, which is 1.90 in decimal.
• American (used in the United States): for example -110, which is about 1.91 in decimal.

A worked example

With decimal odds, the total return is the stake multiplied by the odds. A stake of 10 at odds of 1.90 returns 10 × 1.90 = 19, a profit of 9. Conversely, 1 divided by the odds gives the implied probability: 1 ÷ 1.90 ≈ 53%. That probability includes the bookmaker's margin, so it does not exactly mirror reality.

Single bet or accumulator?

A single bet is placed on one event only: easier to analyse, with a more moderate risk. An accumulator bet groups several selections into one ticket, and the odds multiply together — which increases the potential win, but also the risk, since every selection must win for you to receive anything.

Example: three selections at odds of 1.50, 2.00 and 1.80 give combined odds of 1.50 × 2.00 × 1.80 = 5.40. But if just one selection fails, the whole stake is lost.

To get started, it is generally advised to concentrate on single bets while you learn to read odds and statistics properly.