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Proper bet sizing is one of the most important skills in sports betting. Even if you have a genuine edge on the market, poor bankroll management can lead to ruin. The most widely recommended approach is the Kelly Criterion, which suggests betting a percentage of your bankroll proportional to your edge. In practice, most professional bettors use a fractional Kelly approach, typically betting between one-quarter and one-half of the full Kelly amount. This reduces variance and the risk of catastrophic drawdowns while still capturing most of the expected growth.

A common rule of thumb is to never risk more than 1-3% of your total bankroll on a single bet. If your bankroll is $1,000, each individual wager should be between $10 and $30. This approach ensures that even a bad losing streak will not eliminate your bankroll. The math behind this is straightforward. Even with a 55% win rate on -110 odds, there is still a meaningful probability of experiencing ten or more consecutive losses. Flat betting at 2% of your bankroll means a ten-game losing streak costs you about 18% of your total funds, which is recoverable. Betting 10% per game, the same streak costs 65%, which is extremely difficult to recover from.

The break-even win rate is the minimum percentage of bets you need to win to avoid losing money over time. At -110 odds, the break-even point is approximately 52.4%. Any win rate above that threshold generates profit. Understanding this number helps you evaluate whether your handicapping approach has a genuine edge or whether you are simply getting lucky over a small sample size. Most professional sports bettors maintain win rates between 53% and 57% on standard -110 lines. The difference between 53% and 57% may seem small, but over thousands of bets it represents a massive difference in total profit. Tracking your results meticulously and calculating your actual win rate across different sports, bet types, and odds ranges is essential for long-term success.