How do you convert fractional odds to decimal?

Divide the numerator by the denominator and add 1. Example: 5/2 → (5÷2)+1 = 3.50 decimal. The +1 accounts for the stake return included in decimal odds but not in fractional odds.

Are decimal or fractional odds easier to use?

Decimal odds are simpler for calculating returns and implied probability. Multiply stake by decimal odds for total return (including stake). Implied probability = 1 ÷ decimal odds. Fractional odds express profit only and require additional mental arithmetic for multi-leg calculations.

Why do some bookmakers still use fractional odds?

Fractional odds are the historic UK standard, particularly in horse racing. They express profit relative to stake rather than total return, which UK bettors traditionally preferred. Most bookmakers now offer both formats, with decimal becoming increasingly dominant globally.

Decimal vs Fractional Odds: Which Is Better?

The Quick Answer

Decimal odds are objectively easier to calculate with. They show your total return per £1 staked (including stake). Fractional odds show profit only, which requires an extra step. For anything beyond the simplest mental maths, decimal wins.

Side-by-Side Comparison

Property	Decimal	Fractional
Represents	Total return per unit staked	Profit per unit staked
Includes stake?	Yes	No
Even money looks like	2.00	1/1 or Evens
Return formula	Stake × odds	Stake × (num ÷ denom) + stake
Common in	Europe, Australia, online globally	UK, Ireland, horse racing
Example	2.50	6/4
£100 bet return	£250 (£150 profit)	£150 profit + £100 stake = £250

Converting Between the Two

Fractional → Decimal: divide numerator by denominator, then add 1.
Example: 6/4 → (6 ÷ 4) + 1 = 2.50

Decimal → Fractional: subtract 1, then convert to a fraction and simplify.
Example: 2.50 → 1.50 → 3/2 → simplify to 3/2 (displayed as 3/2)

When Fractional Is Still Useful

Fractional odds dominate UK horse racing coverage — on-course bookmakers, newspapers, and broadcast coverage all use them. If you bet on racing, you need to read fractions fluently. They are also more intuitive for expressing large-underdog prices: 100/1 reads more dramatically than 101.00.

The Real-World Verdict

Switch your online sportsbook to decimal if it isn't already — virtually all platforms support the toggle
Use decimal for any calculations, comparisons, or EV maths
Learn fractional for horse racing reading; convert mentally (or use our converter tool) when you need the number
Neither format changes the underlying probability or the money you win — this is purely a display preference