Football odds to probability calculator

Type in the three prices for a match and see what chance each one implies, how much margin is baked in, and what the probabilities look like once that margin is removed.

What the table is telling you

Odds are a price, and a price hides a probability. Decimal odds of 2.10 mean you get 2.10 back for every 1 staked, so the bookmaker thinks the outcome is worth a hair under 47.6% (1 divided by 2.10). Do the same for the other two outcomes and you will almost never land on exactly 100%. In the example above the three come to about 105.6%.

That extra 5.6 points is the margin, the cut the bookmaker takes for offering the market. Dividing each implied chance by the total spreads it out evenly and gives the Fair column. It is an approximation, because real bookmakers often load more margin onto longshots than favourites, but it is the standard first step and the one most comparison sites use.

Reading margin as a quality signal

Sharp, low-margin books price big European matches at around 2 to 3 points of margin. High-street and promotional prices often carry 6 to 10. If the margin your calculator shows is large, the odds you typed in are padded, and the fair column matters more than the implied one.

Formats

• Decimal (2.10) is used across Europe, Canada and Australia.
• Fractional (11/10) is traditional in the UK and Ireland. 11/10 is 2.10 in decimal.
• American (+110) shows what you win on a 100 stake. Positive numbers are underdogs. -150 means you stake 150 to win 100 and equals 1.67 decimal.

What this does not do

It converts prices. It does not tell you whether a price is right. Ninety does not offer betting and shows win chances for information only. If you want to see how forecasts from a prediction market, a bookmaker and our own model compare across a season, that is on the track record page.