Interactive tools to calculate expected value, optimal bet sizing, implied probability, and more. All calculations run in your browser with no signup required.
Calculate expected value in dollars and percent. Enter American odds and your estimated win probability to see if a bet is +EV or -EV.
Use the EV Calculator →Find the optimal bet size for your bankroll. Supports Full Kelly, Half Kelly, and Quarter Kelly with risk assessment for each.
Use the Kelly Calculator →Convert between American, decimal, and fractional odds instantly. Shows implied probability and breakeven win rate for any odds format.
Use the Odds Converter →Both calculators are designed for bettors who want to think systematically. Start with the EV Calculator to determine whether a bet is worth placing at all. If you find a +EV opportunity, use the Kelly Criterion Calculator to figure out how much of your bankroll to wager.
The process is: estimate your true win probability, plug it into the EV Calculator with the odds, check for positive expected value, then run the Kelly Calculator to size the bet appropriately.
Juice uses three AI models to estimate true probability automatically. Just submit a bet and get EV, implied probability, and edge calculated for you.
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