How to read betting odds: decimal, fractional and American odds

The same price can be shown in three formats. Most of Europe, Australia and the bigger betting apps use decimal odds. Fractional odds are traditional in the UK and Ireland, especially in horse racing. American (moneyline) odds are used mostly in the United States. You only need one of them, but it helps to recognise all three, because they all describe exactly the same thing.

The last column is the implied probability, the chance the price suggests. We cover it fully in implied probability explained. For now, remember that the lower the odds, the more likely the bookmaker thinks the outcome is.

A decimal price is the total amount you get back for each unit you stake, including your stake. The formulas are short:

• Return = stake × decimal odds
• Profit = stake × (decimal odds − 1)

Because the stake is already included, a decimal price can never be below 1.00. A price of 1.10 means you'd stake £10 to get £11 back, a £1 profit. A price of 11.00 means £10 returns £110, a £100 profit.

Decimal odds are also the easiest format for maths. To compare two prices, to work out a double, or to compute the bookmaker's margin, you use the decimal number directly. That's why every calculator on Tipnito works in decimal first.

A fractional price shows profit relative to stake. 5/2 ("five to two") means you win £5 for every £2 staked. Your stake comes back on top.

• Profit = stake × (top number ÷ bottom number)
• Return = profit + stake

A few terms you'll hear with fractional odds:

• Evens (1/1): you win the same as you stake. £10 returns £20.
• Odds-on: the first number is smaller than the second, such as 1/2 or 4/5. You win less than your stake. £10 at 1/2 wins £5 and returns £15.
• Odds-against: the first number is bigger, such as 2/1 or 7/2. You win more than your stake.
• "Two to one on" is the spoken form of 1/2, the reverse of 2/1.

American odds are built around a 100 unit stake and have two forms.

• Positive (+150): the profit on a 100 stake. +150 means $100 wins $150.
• Negative (-200): the stake needed to win 100. -200 means you stake $200 to win $100.

A plus sign means the outcome is the underdog (decimal above 2.00). A minus sign means it's the favourite (decimal below 2.00). +100 and -100 both mean evens, decimal 2.00.

The most common American price you'll see on two-way markets is -110. In decimal that's 1 + 100 ÷ 110 = 1.91. Two sides at -110 add up to more than 100% implied probability, and that extra is the bookmaker's built-in edge.

You'll rarely need to convert by hand, but the formulas are simple and they help you check what a price really means.

Any format → implied probability: convert to decimal first, then 1 ÷ decimal. 2.50 gives 1 ÷ 2.50 = 0.40, so 40%.

Here is the same price idea on a real match from today's schedule, shown in all three formats:

If you'd rather not do the arithmetic, the converter below turns any price into the other two formats and its implied chance:

The single biggest beginner mistake is confusing return with profit. A bet slip usually shows "potential return" or "to return", which includes your stake.

A £20 bet at 1.50 doesn't "make £30"; it makes £10. Thinking in profit keeps you honest about how much you're actually risking to win how much.

Odds are the bookmaker's price, not a forecast you should trust blindly. Two points matter:

1. Odds include a margin. Add up the implied chances in any market and you'll get more than 100%. On a typical 1X2 market you might see 2.10 / 3.40 / 3.60, which adds up to about 104.8%. The extra 4.8% is the bookmaker's margin. Our guide to implied probability shows how to remove it.
2. Odds move. Prices change with team news, weather, and the money that comes in. The price you take is the one that's settled, even if it shortens or drifts later.

A short price doesn't mean "safe". A 1.25 favourite still loses about one time in five if the price is fair. Long prices aren't "value" just because the payout looks big. Whether a bet is worth taking depends on how your own estimate of the chance compares with the price, and that's the idea behind value betting.

Each bookmaker sets its own prices, with its own margin and its own view of the match. On the same evening, one might offer a home win at 2.05 and another at 2.15. That's a 5% difference in the return on every winning bet. The gaps are usually bigger on less popular leagues and on markets like corners or player bets. Comparing prices before you bet is one of the simplest habits that improves your results over time.

• Reading fractional odds backwards. 1/4 is a heavy favourite (you win £1 for every £4). 4/1 is an outsider (you win £4 for every £1).
• Forgetting the minus sign in American odds. -150 and +150 are very different prices: 1.67 against 2.50.
• Comparing returns, not prices. Compare the odds themselves. A 0.10 difference on a 2.00 price is a 10% bigger profit over time, which is why it pays to compare bookmakers.
• Assuming the favourite will win. Odds-on prices lose regularly. Over a season, plenty of 1.40 shots fail.
• Ignoring the market's rules. A football 1X2 price is settled on 90 minutes plus stoppage time, not extra time. See 1X2 betting for the details.

Once you can read a price, the next step is turning it into a probability and spotting the margin: read implied probability. If you want to see prices on real matches, browse today's predictions or the team numbers on our stats pages.