Fractional to Decimal Odds Converter
Convert UK fractional odds to decimal format instantly with examples and conversion formulas
Fractional to Decimal Converter
Enter fractional odds in X/Y format (e.g., 5/2, 3/1, 1/4) to see the decimal equivalent.
Quick Examples
Conversion Result
Calculation Breakdown
5 ÷ 2 + 1 = 3.50
What is Fractional to Decimal Conversion?
Fractional to decimal conversion transforms traditional UK betting odds into the decimal format used globally by most online bookmakers. Fractional odds (like 5/2) show profit relative to stake, while decimal odds (like 3.50) show total return including your original stake.
Conversion Formula
Decimal Odds = (Numerator ÷ Denominator) + 1
Where:
- Numerator = The first number (profit)
- Denominator = The second number (stake)
- +1 = Accounts for stake being returned
Example: Converting 5/2 to decimal: (5 ÷ 2) + 1 = 2.5 + 1 = 3.50 decimal odds
Comparing Odds Formats
Fractional Odds
Origin: United Kingdom & Ireland
Format: X/Y (e.g., 5/2, 3/1)
Shows: Profit relative to stake
Traditional format for horse racing and UK bookmakers
Decimal Odds
Origin: Europe, Australia, Canada
Format: X.XX (e.g., 3.50, 4.00)
Shows: Total return per $1 wagered
Standard format for most online betting sites worldwide
Why Convert?
Easier Calculations: Multiply stake by decimal
Universal Format: Used globally online
Quick Comparison: Instantly see better value
Decimal odds are simpler for parlay and multi-bet calculations
Real-World Conversion Examples
Example 1: Converting 5/2 (Favorites)
Fractional: 5/2
Calculation: (5 ÷ 2) + 1 = 3.50
Decimal: 3.50
Meaning: Win $5 for every $2 staked, or get $3.50 back for every $1 bet
Example 2: Converting 1/4 (Strong Favorites)
Fractional: 1/4
Calculation: (1 ÷ 4) + 1 = 1.25
Decimal: 1.25
Meaning: Win $1 for every $4 staked, representing 80% implied probability
Example 3: Converting 10/1 (Longshots)
Fractional: 10/1
Calculation: (10 ÷ 1) + 1 = 11.00
Decimal: 11.00
Meaning: Win $10 for every $1 staked, representing 9.09% implied probability
Professional Conversion Tips
Remember the +1
Always add 1 to the division result. This accounts for your stake being returned with your winnings in decimal format.
Check Both Formats
Some bookmakers show better odds in one format due to rounding. Always compare both fractional and decimal to find value.
Understand Probability
Convert to implied probability (1 ÷ decimal odds × 100) to assess if odds represent true value based on your analysis.
Use for Parlays
Decimal odds make parlay calculations easier - just multiply all decimal odds together, then multiply by your stake.
Memorize Common Conversions
Learn frequently-used conversions: 1/1 = 2.00, 2/1 = 3.00, 5/2 = 3.50, 1/2 = 1.50, 1/4 = 1.25, 10/1 = 11.00.
Round Appropriately
Most bookmakers display decimal odds to 2 decimal places. Round to .XX for accurate comparisons across betting sites.
Common Fractional to Decimal Conversions
| Fractional Odds | Decimal Odds | Implied Probability | $10 Bet Returns |
|---|---|---|---|
| 1/10 | 1.10 | 90.91% | $11.00 |
| 1/5 | 1.20 | 83.33% | $12.00 |
| 1/4 | 1.25 | 80.00% | $12.50 |
| 1/3 | 1.33 | 75.00% | $13.30 |
| 1/2 | 1.50 | 66.67% | $15.00 |
| 1/1 (Evens) | 2.00 | 50.00% | $20.00 |
| 6/4 | 2.50 | 40.00% | $25.00 |
| 2/1 | 3.00 | 33.33% | $30.00 |
| 5/2 | 3.50 | 28.57% | $35.00 |
| 3/1 | 4.00 | 25.00% | $40.00 |
| 4/1 | 5.00 | 20.00% | $50.00 |
| 9/1 | 10.00 | 10.00% | $100.00 |
| 10/1 | 11.00 | 9.09% | $110.00 |
| 20/1 | 21.00 | 4.76% | $210.00 |
| 50/1 | 51.00 | 1.96% | $510.00 |
Frequently Asked Questions
How do you convert fractional odds to decimal odds?
To convert fractional odds to decimal odds, divide the numerator by the denominator and add 1. For example, 5/2 becomes (5 ÷ 2) + 1 = 3.50. The +1 accounts for your original stake being returned.
Why are fractional odds still used in betting?
Fractional odds are traditional in UK and Irish betting, especially for horse racing. They clearly show the profit relative to stake, which many bettors find intuitive. Modern bookmakers offer both formats.
What does 5/2 odds mean in betting?
5/2 odds (also written as 5-to-2) means you win $5 for every $2 wagered. If you bet $10 at 5/2, you would win $25 profit plus get your $10 stake back for a total return of $35.
Which is better: fractional or decimal odds?
Neither format is inherently better - it is personal preference. Decimal odds are easier for calculating total returns (just multiply stake by odds), while fractional odds clearly show profit ratio. Most online bookmakers support both formats.
What are even odds in fractional format?
Even odds are expressed as 1/1 (also called evens) in fractional format, meaning you win $1 for every $1 wagered. In decimal format, even odds are 2.00. This represents a 50% probability.
How do you calculate winnings from fractional odds?
To calculate winnings: (Stake × Numerator) ÷ Denominator = Profit. For example, a $10 bet at 5/2: ($10 × 5) ÷ 2 = $25 profit. Your total return would be $25 profit + $10 stake = $35.