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.
Uses your edge to tell you the exact % of your bankroll to stake, aiming for the fastest long-term growth. If you truly know the chances better than the book, Kelly squeezes the most profit. Get the probability wrong and Kelly can swing your bankroll hard.
Same formula, half the stake. Kelly’s gains, but with seatbelts. Less boom, less bust. Use it when you think you have an edge but don’t fully trust your numbers (welcome to reality).
Bet the same small % (e.g., 1–2%) of your bankroll every time. Dead simple. You’ll never overbet, and your stake naturally scales with your roll. Trade-off: slower growth than perfect Kelly, but far safer for newcomers.
Checks if a bet is positive EV (+EV)—profitable in the long run. It compares your estimated probability to the odds’ implied probabilityThe probability the bookmaker's odds suggest. For decimal odds, 1 / odds. so you can spot value bets and bin the losers.
Bottom line: 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.