Betting Tools
Free calculators to sharpen your betting math. No login required.
🎰
Parlay Calculator
Add multiple legs, calculate combined odds, potential payout, and implied probability for any parlay.
- ✓Multi-leg support
- ✓American odds input
- ✓Total payout + implied prob
- ✓Breakeven %
🔄
Odds Converter
Convert between American, Decimal, and Fractional odds in real time. Plus implied probability.
- ✓American ↔ Decimal ↔ Fractional
- ✓Implied probability
- ✓Preset buttons
- ✓Instant conversion
📊
EV Calculator
Calculate expected value and Kelly criterion stake size for any bet. Know if you have an edge.
- ✓Expected value per $100
- ✓Kelly criterion stake
- ✓+EV / -EV indicator
- ✓Win probability input
📒
Bankroll Tracker
Log your bets, track P&L, and visualize your bankroll over time. All stored locally in your browser.
- ✓Bet log (W/L/P)
- ✓Running P&L
- ✓Win rate + ROI
- ✓Bankroll chart
💡 Pro Tip
Use the EV Calculator to determine if a bet has positive expected value, then use the Kelly Criterion output to size your bet optimally. Combine with the Bankroll Tracker to measure your actual ROI over time.