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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.
Once you have your AGS, use it to determine your handicap differential. 1  The equation for a Handicap Differential is the Course Rating minus your AGS, multiplied by 113, and divided by the Slope Rating, or (AGS-Course Rating) x 113 / Slope Rating.. Find your adjusted gross score. To calculate your Handicap Index, youâll first need a minimum of five golf scores (and no more than 20). 1  Gather at least five scores 18-hole scores or ten 9-hole scores and use them to calculate your Adjusted Gross Score.