The bankroll management system that keeps professional bettors in action. Unit sizing, Kelly criterion, and how to never go broke.
You can win 55% of your bets and still go broke with bad bankroll management. Conversely, a disciplined bettor with a 53% win rate can grow their bankroll steadily for years. The math of betting means variance will create losing streaks — your job is to survive them.
Professional bettors use units — a percentage of their bankroll — instead of fixed dollar amounts. Standard: 1 unit = 1-2% of your total bankroll. A $1,000 bankroll means 1 unit = $10-20.
Unit sizing by confidence: 1 unit = standard play, 2 units = strong play, 3 units = max confidence. Never go above 3 units on a single bet. Never.
The Kelly Criterion calculates optimal bet size based on your edge and the odds. Simplified: if you have a 55% chance of winning a -110 bet, Kelly says bet about 5.5% of your bankroll. Most pros use half-Kelly (2.75%) to reduce variance. Never use full Kelly — it's too aggressive for the variance in sports betting.
Never have more than 50% of your bankroll in action at once. Keep a reserve for adding to positions, taking advantage of line movement, and surviving downswings. The biggest mistake beginners make: going all-in during a hot streak and then having nothing left when variance catches up.
You cannot improve without data. Track every single bet: date, sport, matchup, pick, odds, units wagered, result. Review monthly. Without tracking, you'll have no idea which sports, bet types, or situations are actually profitable for you. This is how you turn betting from gambling into an edge.
Our AI models pick the best bets daily. Follow along free.
Start Betting Smart →