Bet Sizing & Bankroll Management Calculators
These tools tell you how much to bet on each pick so you don’t torch your bankroll. Pick the method that matches how confident you are and how wild a ride you can stomach.
Two basics before you start
- Bankroll: the total money you’ve set aside for betting.
- Edge: when you think the real chance of something happening is better than the odds suggest.
Our advice
Always check EV—no edge, no bet. Use Kelly if you’re great with numbers and have solid models. Cut it to Half Kelly if you hate big swings or aren’t 100% sure. New? Start with Fixed % and learn while you protect your roll.
Quick glossary
- Implied Probability: the chance the odds say will happen (1 ÷ decimal odds).
- Variance: the ups and downs. High variance = big swings.
- Risk of Ruin: blowing up your bankroll. Bad sizing speeds it up.