Glossary
By Karim BenaliFootball & Responsible Gambling JournalistHey, it's Karim. Ever stumble upon odds written strangely, like "3/2" or "+150", and feel completely lost? Don't sweat it: these are just different ways of expressing the same thing. There are three main odds formats used globally. I'll break them down simply for you, along with how to convert between them.
Three Ways to Say the Same Thing
First, here's the crucial point that will put your mind at ease: odds of 2.50, 3/2, and +150 are exactly the same odds, just written differently depending on the country. Three languages for one piece of information: what your bet pays out.
| Format | Example | Used In |
|---|---|---|
| Decimal | 2.50 | France, Europe |
| Fractional | 3/2 | United Kingdom |
| American | +150 | United States |
Immediate good news: in France, you'll almost exclusively see decimal odds. But it's worth understanding the others, just in case.
Decimal Odds (Your Go-To, The Simplest)
The decimal format is likely the one you're most familiar with and is the simplest worldwide. The rule is straightforward:
Your Stake × Odds = Total Payout (including your stake).With odds of 2.50: a £10 stake returns a total of £25 (£15 profit). No convoluted calculations needed. This is the standard in France and Europe, across all licensed bookmakers. We detail everything in understanding odds.
Fractional Odds (British Standard)
The fractional format, like 3/2, is preferred by the British (and for horse racing). It indicates the profit relative to your stake, not the total payout.
3/2 is read as "3 to 2": you win 3 units of profit for every 2 units staked. So, for a £10 stake, you win £15 profit (plus your returned stake, for a total of £25). Notice that? We land back on the same value as decimal odds of 2.50. Logical: it's the same odds.The key difference: fractional odds show profit only, while decimal odds include your stake. Less intuitive for a French bettor, perhaps, but nothing complicated once you know the ropes.
American Odds (US Standard)
The American format is arguably the most perplexing. It uses numbers with a + or - sign:
- Positive Odds (+150): indicates the profit for every 100 units staked. +150 = you win 150 units of profit for every 100 units staked. This is for underdogs.
- Negative Odds (-200): indicates how much you need to stake to win 100 units. -200 = you must stake 200 units to win 100 units. This is for favourites.
The sign immediately tells you if it's an underdog (+) or a favourite (-). Clever in its own way, but honestly, be glad you're in France with decimal odds.
Easy Conversion
The only truly useful calculation: converting from fractional to decimal (if you happen to land on a British site).
Decimal = (First Number ÷ Second Number) + 1Examples:
- 3/2 → (3 ÷ 2) + 1 = 2.50
- 5/1 → (5 ÷ 1) + 1 = 6.00
- 1/2 → (1 ÷ 2) + 1 = 1.50
The +1 accounts for your stake, which is included in decimal odds but not in fractional. Once you grasp this logic, conversion takes mere seconds.
The Key Takeaway
Let's be practical, cutting straight to the chase. In France, you'll use the decimal format everywhere, on all ANJ-licensed bookmakers. So, you'll almost never need the other formats, unless you're dabbling on a foreign site (which I don't recommend; it's always better to stick with legal bookmakers).
Just remember: Decimal = Stake × Odds = Total Payout. That's 95% of what you'll ever need. The other formats are useful general knowledge, but rarely essential.
In Summary
- Three formats convey the same information: Decimal (2.50), Fractional (3/2), American (+150).
- Decimal (France): Stake × Odds = Total Payout. The simplest.
- Fractional (UK): Profit only (3/2 = 3 won for every 2 staked).
- American (US): + for underdog (profit/100 staked), - for favourite.
- Fractional → Decimal conversion: (a ÷ b) + 1.
- In France, decimal odds are sufficient 95% of the time. Bet Responsibly.
Frequently asked questions
What are the three betting odds formats?
Decimal odds (like 2.50), used in France and Europe; fractional odds (like 3/2), used in the United Kingdom; and American odds (like +150 or -200), used in the United States. All three express the same thing in different ways: what a bet pays out.
How do you read decimal odds?
Decimal odds are the simplest: you multiply your stake by the odds to get your total payout, including your initial stake. Odds of 2.50 mean that a £10 stake returns a total of £25. This is the standard format in France, requiring no complex calculations.
How do fractional odds work?
Fractional odds, like 3/2, indicate the profit relative to your stake: 3/2 means you win 3 units of profit for every 2 units staked. For a £10 stake, you win £15 profit, plus your returned stake. It's the traditional British format, less intuitive for a French bettor.
What do American odds of +150 or -200 mean?
Positive American odds (+150) indicate the profit for every 100 units staked: +150 means you win 150 units of profit for every 100 units staked. Negative odds (-200) indicate how much you need to stake to win 100 units: -200 means you must stake 200 units to win 100 units. The sign distinguishes underdogs (+) and favourites (-).
How do you convert fractional odds to decimal?
Divide the first number by the second, then add 1. For example, 3/2 becomes (3 ÷ 2) + 1 = 2.50. The +1 accounts for your stake, which is included in decimal odds but not in fractional. Once the logic is understood, conversion is quick.
Which odds format is used in France?
In France and most of Europe, the decimal format (like 1.85 or 2.40) is dominant across all licensed bookmakers. Therefore, you'll almost never need the other formats, unless you're using a foreign site. Decimal is the simplest, so you're in luck.
A lifelong football fan. I write so that even my mum understands xG.