What do odds of 2.00 mean?

2.00 is an even-money price, equivalent to 1/1 fractional or +100 American. It implies a 50% chance and doubles your stake if it wins.

How do I convert odds to a percentage?

Divide 100 by the decimal odds. 4.00 gives 25%, 1.60 gives 62.5%. For fractional odds, convert to decimal first by dividing the first number by the second and adding one.

Do shorter odds mean a better bet?

No. Shorter odds mean a more likely outcome, not a better bet. A bet is worth making when the price is longer than the true probability justifies, which happens at both short and long prices.

How to read football betting odds

Odds do two jobs at once: they tell you what a winning bet returns, and they state the probability the bookmaker is willing to lay. Reading the second one is what separates a considered bet from a guess.

Decimal odds

Decimal odds are the standard across Europe and the clearest format to work with. The number is your total return per unit staked, stake included. A 10 stake at 2.50 returns 25 — 15 profit plus your 10 back.

To convert to a probability, divide 100 by the odds. 2.50 implies 40%. 1.50 implies 66.7%. 5.00 implies 20%. That single calculation is the most useful habit in betting, because it turns a price into a claim you can agree or disagree with.

Fractional odds

Fractional odds are still standard in the UK. They show profit relative to stake rather than total return. 3/1 means three profit for every one staked; a 10 bet returns 40 in total.

To convert fractional to decimal, divide the first number by the second and add one. 3/1 becomes 4.00. 5/2 becomes 3.50. 1/2 — an odds-on price — becomes 1.50.

American odds

American odds use a positive or negative number based around a 100 unit. A positive price, such as +250, is the profit on a 100 stake. A negative price, such as -150, is the stake required to win 100.

+250 is 3.50 in decimal. -150 is 1.67. Anything negative is an odds-on favourite.

The overround, and what it costs you

Convert every selection in a market to a probability and add them up. On a 1X2 market priced at 1.75, 3.60 and 4.20, that gives 57.1% + 27.8% + 23.8% = 108.7%. The 8.7% above 100 is the bookmaker's margin, known as the overround or the vig.

It is the reason betting at random loses money over time even when your selections are right about half the time. It is also why shopping between bookmakers matters: on the same match, a book running a 104% margin gives you materially better prices than one running 109%, and that difference compounds across every bet you place.

What value actually means

A bet has value when your assessment of the probability is higher than the probability implied by the price. If you rate a home win at 50% and the price is 2.50 — an implied 40% — that is value, whether or not it wins on the day.

Backing a strong favourite at a short price is not value simply because they are likely to win. You are being asked whether they are more likely to win than the price says. Those are different questions, and only the second one determines whether a bet is worth making.

Frequently asked questions

What do odds of 2.00 mean?: 2.00 is an even-money price, equivalent to 1/1 fractional or +100 American. It implies a 50% chance and doubles your stake if it wins.
How do I convert odds to a percentage?: Divide 100 by the decimal odds. 4.00 gives 25%, 1.60 gives 62.5%. For fractional odds, convert to decimal first by dividing the first number by the second and adding one.
Do shorter odds mean a better bet?: No. Shorter odds mean a more likely outcome, not a better bet. A bet is worth making when the price is longer than the true probability justifies, which happens at both short and long prices.