Convert between decimal, fractional, American odds and implied win probability percentages instantly.
How odds conversion works
Betting odds reflect the implied probability of an outcome occurring, plus the bookmaker’s profit margin (overround). Different regions and platforms prefer different formats:
• Decimal (European): Displays total return for every £1 staked (e.g. 2.50 = £2.50 total return).
• Fractional (UK traditional): Displays profit relative to stake (e.g. 6/4 = £6 profit for every £4 staked).
• American (Moneyline): Positive numbers show profit on a £100 wager (e.g. +150); negative numbers show stake needed to win £100 (e.g. -200).
• Implied Probability: The statistical chance represented by the price: Probability = 1 / Decimal Odds × 100%.
Common odds conversion chart
Quick Conversion Reference
• 2.00 Decimal: Evens (1/1) Fractional • +100 American • 50.00% Probability
• 2.50 Decimal: 6/4 (3/2) Fractional • +150 American • 40.00% Probability
• 3.00 Decimal: 2/1 Fractional • +200 American • 33.33% Probability
• 5.00 Decimal: 4/1 Fractional • +400 American • 20.00% Probability