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Betting tools

Free educational calculators to make more informed decisions. 100% client-side, no signup, no cost.

Value analysis

Calculate EV, edge, ROI, Kelly and build parlays in real time.

Bankroll management

Optimal bankroll fraction per Kelly criterion, with fractional Kelly (1/2, 1/4, 1/8).

Calculate stake by % of bankroll and simulate streaks (flat, proportional, Fibonacci, Martingale).

Odds conversion

Convert between decimal, fractional, American, Hong Kong, Malay, Indonesian and implied probability.

Payout calculation

Calculate returns for straight bet, Asian handicap (half-win/loss) and Over/Under.

Performance analysis

Measure your performance from betting history, including CLV (Closing Line Value).