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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.
Handicap Differential. (Score â Course Rating) x 113 / Slope Rating. The first step to finding out your handicap starts with getting some rounds in and collecting data from those performances. Generally, a range of 5-20 of your most current rounds will suffice as enough reps to accurately calculate your handicap.You will need to find the course rating and slope of the golf property you played on. Subtract the course rating from your score and multiple by 113.Divide the product by the slope listed on your scorecard (115 in the example) to obtain your handicap differential.enerally, a range of 5-20 of your most current rounds will suffice as enough reps to accurately calculate your handicap. You will need to find the course rating and slope of the golf property you played on. Subtract the course rating from your score and multiple by 113.