Fractional to Decimal Odds Converter

Odds Converter

Fractional to Decimal Odds Converter

Fractional odds are the historic UK and Irish format — common at racecourses and on British sports broadcasts — while decimal odds are the standard for online global sportsbooks. The conversion is a single division plus one. Once you have the decimal value, you can compute payouts and implied probability with a calculator instead of mental fractions.

Quick example: 6/4 (fractional) = 2.50 (decimal). Use the calculator below for any value, or scroll for the full conversion table.

The formula

One formula:

Conversion table

Common odds across all three formats. Use this as a quick reference; the calculator above handles any value to four decimal places of precision.

DecimalAmericanFractional
1.10-10001/10
1.25-4001/4
1.40-2502/5
1.50-2001/2
1.67-1504/6
1.75-1333/4
1.83-1205/6
1.91-11010/11
2.00+1001/1 (Evens)
2.10+11011/10
2.25+1255/4
2.50+1506/4
3.00+2002/1
3.50+2505/2
4.00+3003/1
5.00+4004/1
6.00+5005/1
11.00+100010/1
21.00+200020/1
51.00+500050/1
101.00+10000100/1

When to use fractional odds

Fractional odds dominate UK and Irish high-street betting shops, the Cheltenham Festival, Royal Ascot, the Grand National, and ITV/Sky Sports racing. Some long-time punters strongly prefer fractions because they map directly to "what I win per pound staked."

When to use decimal odds

Decimal odds are the universal online format and the easiest for arbitrage, value betting, and exchange trading. They are the default on most non-UK sites — and most UK sites let you toggle to decimal in account settings.

Frequently asked questions

What is 5/2 in decimal?

5/2 = 2.5 + 1 = 3.50. A £10 bet returns £35 total (£25 profit + £10 stake back).

What does 1/2 (one-to-two on) mean in decimal?

1/2 = 0.5 + 1 = 1.50. The horse is "odds-on" — heavy favorite. A £10 bet returns £15 total (£5 profit).

Why are some fractional odds non-reduced like 6/4 instead of 3/2?

Tradition. UK racing markets historically use halves, quarters, eighths because those denominators are familiar to track punters. Online operators may show the same price as 3/2.

How do I read "Evens" or "EVS" on a betting board?

Evens = 1/1 = decimal 2.00. A £10 bet returns £20 total (£10 profit). The implied probability is 50%.

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