Thank you for hanging in there with our information on the Handicap System. As suggested last week, it may come across as a little dry for our non-golfing followers however our more traditional articles (the normal nonsense) will return shortly.
Last week we reviewed the fundamentals/concepts, this week we will share the math to calculate your Handicap without utilizing an automated service.
Three Steps:
1. Total your score(s) using the “Adjusted Gross Score” guidelines
2. Adjusted Gross Score – Course Rating x 113 (average Slope Rating) divided by the courses Slope Rating = Differential Score
Example: Adjusted Gross Score (85) – Course Rating (70.8) x 113 (average Slope Rating) divided by the courses Slope Rating (i.e. 130) = 12.34 Differential Rating
3. Calculate your Differential Rating for your previous twenty rounds. Average the Differential Rating for the lowest ten rounds and multiply by 96% (rounding to the nearest tenth).
Example: Average Differential Rating for the lowest ten rounds of your past twenty rounds (11.21) x 96% = 10.76 or 10.8 Handicap Index
Below is an example of the “Lowest Ten Adjusted Gross Scores/Differential Rating” out of the past twenty rounds. Each Differential Rating will be impacted by the individual course’s Course Rating and Slope Rating:
Adjusted Gross Score/Course Rating/Average Slope Rating*/Slope Rating = Differential Rating:
85 – 76.2 x 113 divided by 146 = 6.81
89 – 74.7 x 113 divided by 147 = 10.99
91 – 75.2 x 113 divided by 155 = 11.52
94 – 74.4 x 113 divided by 143 = 15.49
83 – 70.8 x 113 divided by 130 = 10.60
93 – 73.4 x 113 divided by 146 = 15.17
87 – 73.0 x 113 divided by 137 = 11.55
80 – 71.8 x 113 divided by 130 = 7.13
84 – 73.0 x 113 divided by 128 = 9.71
90 – 74.1 x 113 divided by 137 = 13.11
Total Differential Rating (112.08) divided by 10 (10 rounds) x 96% = 10.76 or 10.8 Handicap Index
*113 is a constant number for the Handicap Index calculation. It represents the Slope Rating of a golf course with average difficulty.
In the weeks to come, the Par/Yardage/Course Rating/Slope Rating/ Bogey Rating/Handicap Index/Handicap of some familiar courses.
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