Tools
Tools for people who bet smart
Free, fast calculators for bettors and prediction-market traders — no signup. Convert odds, find arbs, size your bets, run the poker math, and keep an honest ledger.
Betting & markets
Convert odds, find arbs, size your bets, and check your edge.
Odds Converter
American ↔ decimal ↔ fractional ↔ implied %.
Arbitrage Calculator
Two-way arb, stake split, guaranteed profit.
EV Calculator
Is your bet +EV? ROI, fair odds, edge.
Parlay Calculator
Combine legs → odds, payout, profit.
Kelly Calculator
Optimal stake from your edge & bankroll.
Bankroll Calculator
Unit size & staking plan; survive variance.
Bonus Calculator
Real bonus value after wagering requirements.
Poker
Tournament and cash-game math.
Track your bets
Keep an honest ledger of every bet.