Betting Tools
Professional calculators to help you find value, convert odds, and manage your bankroll.
Odds Converter
Convert between Decimal, American, and Fractional formats.
American
Fractional (Approx)
Implied Probability
Quick Presets
Arbitrage Calculator (2-Way)
Find guaranteed profit opportunities.
Total Implied %:
Bet on A
Bet on B
Profit
The combined probability is greater than 100%, meaning the bookmaker has an edge (margin).
How it works:
An arbitrage opportunity exists when the combined implied probabilities from different bookmakers total less than 100%. This calculator helps you find the optimal stake distribution to guarantee profit regardless of outcome.
Margin Calculator
Calculate the house edge (vig) on any market.
True Odds 1
True Odds 2
Margin
Excellent Value
Standard Margin
High Margin
Payout:
Interpretation:
Lower margin means better value for you. A standard margin is between 4-6%. Anything below 3% is excellent value.
Common Industry Margins
Exchanges
1-2%
Top Books
3-4%
Average
5-6%
High Margin
7%+