Odds Types Explained: Decimal, Fractional and Moneyline Odds
Learn how decimal, fractional, and moneyline odds work, how to convert them, and why odds formats matter when comparing free bet offers.
Last updated 31 March 2026
Odds types are just different ways of showing the same betting price. In the UK, decimal odds and fractional odds are the formats most punters see every day, while moneyline odds are more common on US-facing sportsbooks and betting content.
If you compare free bet offers, understanding decimal, fractional, and moneyline odds makes the terms easier to read and the value easier to judge. It also helps when you move between bookmakers, comparison sites, and guides that use different formats for the same market. That matters even more when you are reading wider explainers on different types of free bet promotions.
The three main odds types
- Decimal odds: the clearest format for total return
- Fractional odds: the traditional UK format for profit relative to stake
- Moneyline odds: the American format using plus and minus prices
All three formats express the same probability and payout. The only difference is how the number is presented. Once you understand the conversion, a price such as 3.50, 5/2, and +250 stops looking like three different bets and starts looking like the same selection in three different languages.
What decimal odds mean
Decimal odds show your total return for every £1 staked, including your original stake. That makes decimal prices the easiest format for many punters, especially when comparing free bet offers and working out likely returns quickly.
- Odds of 2.00 mean a £10 stake returns £20 in total
- Odds of 3.50 mean a £10 stake returns £35 in total
- Profit is total return minus stake
Decimal example
A £10 bet at decimal odds of 4.00 returns £40 in total, made up of £30 profit plus the original £10 stake.
What fractional odds mean
Fractional odds show profit relative to stake. If the price is 5/1, you win £5 profit for every £1 staked. If the price is 6/4, you win £6 profit for every £4 staked. Fractional odds are still common across UK betting sites, racing coverage, and older bookmaker interfaces.
Many punters like fractional odds because they make the profit side very explicit. The downside is that they are slower to scan when you want total return, especially if you are comparing several free bet options and minimum-odds requirements at once.
What moneyline odds mean
Moneyline odds, also called American odds, use positive and negative numbers. A positive price such as +200 shows how much profit you win from a 100-unit stake. A negative price such as -150 shows how much you need to stake to win 100 units of profit.
- +200 means £100 would win £200 profit
- -150 means you need to stake £150 to win £100 profit
- Positive moneyline prices are usually underdogs, negative prices are usually favourites
Decimal, fractional, and moneyline conversions
| Decimal | Fractional | Moneyline | Implied probability |
|---|---|---|---|
| 1.50 | 1/2 | -200 | 66.7% |
| 2.00 | 1/1 | +100 | 50.0% |
| 2.50 | 6/4 | +150 | 40.0% |
| 3.00 | 2/1 | +200 | 33.3% |
| 3.50 | 5/2 | +250 | 28.6% |
| 5.00 | 4/1 | +400 | 20.0% |
The implied probability column is useful because it turns every odds type into the same concept: the bookmaker's view of the chance of the outcome happening, before margin is stripped out. That is often the quickest way to compare prices across different formats.
How to convert odds types quickly
- Fractional to decimal: divide the first number by the second, then add 1
- Decimal to implied probability: 1 divided by decimal odds
- Positive moneyline to decimal: divide by 100, then add 1
- Negative moneyline to decimal: 100 divided by the absolute value, then add 1
You do not need to calculate every price by hand, but knowing the shape of the conversions helps. For example, even-money 1/1 is 2.00 in decimals and +100 in moneyline. Once you remember a few anchor points, reading the rest becomes much faster.
Why odds types matter for free bets
Odds types matter most when a bookmaker sets minimum qualifying odds for a free bet offer. A term like minimum odds of 2.00 is easy if your account is set to decimal, but the same threshold looks different as evens in fractional or +100 in moneyline. Knowing the equivalent price stops you misreading a promotion, especially when comparing a simple free bet with bonus funds that carry wagering.
They also matter when comparing value. If one site shows 13/8, another shows 2.63, and an American source shows +163, you need to know those prices are all roughly the same before deciding whether one bookmaker is genuinely offering more value or just using a different display format.
Related free bet guides
If you are learning odds because you want to compare bookmaker promos properly, the next step is understanding different types of free bet promotions and the difference between free bets and bonus funds.
Odds Types FAQ
These are the main questions punters ask when moving between decimal, fractional, and moneyline odds.
Which odds type is easiest for beginners?
Decimal odds are usually the easiest because they show the total return directly, including stake. That makes them especially useful when checking free bet offer terms and calculating potential payouts quickly.
Are decimal and fractional odds showing the same price?
Yes. Decimal and fractional odds are just different ways of displaying the same selection price. For example, 3.00 in decimal is the same as 2/1 in fractional.
What does +200 mean in moneyline odds?
+200 means a 100-unit stake would win 200 units of profit. In decimal terms, that is 3.00, and in fractional terms it is 2/1.
What moneyline price equals evens?
Evens, or 1/1, is 2.00 in decimal and +100 in moneyline odds.
Why do free bet guides mention minimum odds in different formats?
Because bookmakers, comparison pages, and international betting content do not always use the same odds display. Understanding the equivalent prices helps you avoid misreading qualifying terms.