The most important question to ask is how much does the money mean to you? Is your bankroll depended upon for income? Do you have disposable income from your job that can replenish your bankroll if you lost it? Would you be willing to give up gambling if you lost your bankroll? Once you answer these questions then you can go about sizing your bets. If it is small and doesn't have a lot of gambling winnings, you probably can bet a higher percentage. Higher chance of busting, but the idea is if you lost a smaller amount not a huge disaster. If you are living off sports betting then obviously the story changes. Personally I think 2% bets work for most people. I have an additional add-on of 20 units, for sanity's sake. When it comes down to it, a 50-unit loss at flat bets is nearly impossible if you are truly a winning player. It might happen once in your career. The key though is that 50-unit losses are a lot more likely if you won say 30-units before it. You can't overdo it, you must keep some won units in your bankroll until you have "earned" them out. This means take your expectation for wins and multiply it by your action. That amount is what you theoretically should have won and can extract from your actual winnings. If you won more, keep it in your bankroll until you win it out. This simple step is rarely followed, but extremely important if you are going to take money out of a bankroll as you play. I always advise not taking anything out for years, but if you want regular withdrawls at least follow this step and save yourself tons of headache.