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Handicap Differential. First, you determine the handicap differential for each round of golf you played, up to the last 20 rounds. Subtract the USGA course rating from your score. Take the difference and multiply it by the standard USGA slope rating, which is 113.Then divide that number by the course's slope rating.andicap Index. To calculate your handicap index, you average a certain number of your best handicap differential scores, depending on how many scores you have accumulated. Ideally, you want 20 scores, so you can use the lowest 10 of the last 20.
First you need to establish what your starting handicap would be. What you need is the following information: 1  Three scorecard for games played over a 18 hole course. 2  The course standard scratch score (SSS) of the Tee you are playing on. 3  Usually ranges between 70-74.