A Handicap Differential is the difference between a player's adjusted gross score and the USGA Course Rating of the course on which the score was made.
The difference is then multiplied by 113, and then divided by the USGA Slope Rating from the tees played and rounded to the nearest tenth.
Eddy shoots 75 on a par 72 golf course
Golf Course Rating is 68.5
Slope is 131
75 - 72 = 3
3 x 113 = 339
339 divided by 131 = 2.6 Handicap Differential
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