Determining an appropriate bankroll size and betting unit size for sports betting hinges on personal financial circumstances and risk tolerance. A common guideline is to set aside an amount that one can afford to lose without significantly impacting their financial stability—this could range from a few hundred to several thousand dollars, depending on individual wealth and betting goals. Once the bankroll is established, the betting unit size should typically be a small percentage of the total bankroll, often between 1% to 5%, allowing for sufficient room to absorb fluctuations in wins and losses.