Calculators
Free betting math tools — de-vig lines, convert odds formats, and size your stakes with Kelly.
De-Vig Calculator
Remove the bookmaker margin to find true odds. Supports multiplicative, additive, Shin, and power methods.
Odds Converter
Convert between Decimal, Fractional, American, Malay, Hong Kong, Indonesian, and Implied Probability.
Kelly Criterion
Calculate optimal stake size based on your edge. Fractional Kelly default for safer bankroll management.
xG / Poisson Calculator
Over/Under, BTTS, most-likely score, and 1X2 fair probabilities from expected goals.