Betting Tools

Useful tools to help you make better betting decisions. Convert odds between formats, calculate implied probability, and understand the bookmaker's margin.

🔄 Odds Converter & Implied Probability

Convert odds between decimal, fractional, and American formats. Calculate implied probability, bookmaker margin (vig), and vig-free fair probabilities.

Enter 2+ outcomes for the same event (e.g. Home/Draw/Away) to calculate the bookmaker's margin (vig) and see fair probabilities.

Converted Odds Implied probability is the chance of an outcome happening according to the odds. E.g., odds of 2.00 imply a 50% chance.

Margin (Vig) The bookmaker's built-in profit margin. Sum of all implied probabilities above 100% is their edge. A negative margin may indicate an arbitrage opportunity. —
🟢 ARB OPPORTUNITY — Total implied probability is below 100%. You may be able to lock in a guaranteed profit.
Decimal Fractional American Implied Prob Fair Prob (Vig-Free)

📋 Recent Conversions

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🎯 Kelly Criterion Calculator

Determine the optimal stake size based on your bankroll, the odds offered, and your estimated probability of winning. Helps manage long-term bankroll growth and prevent over-betting.

0% of bankroll
Decimal —
Fractional —
American —
Bookmaker Implied —
Your Edge —
Full Kelly —
½ Kelly —
Recommended Stake —
Potential Profit —
Potential Return —
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