Use six free calculators for odds, value, stake sizing, parlays, hedging, and closing line education. No login is required.
Convert a price
Convert American, decimal, fractional, and implied probability formats.
Compare two prices
Compare the price you took with the market close.
Combine parlay legs
Calculate combined odds, implied probability, payout, and profit.
Estimate stake size
Estimate full and half Kelly stake from bankroll, price, and probability.
Balance two outcomes
Compare hedge size, total exposure, and the modeled floor outcome.
Test expected value
Measure modeled value from stake, price, and your win probability.