(Score - Course Rating) x 113 / Slope Rating
How Many Rounds Used:
If you have only 5 or 6 rounds in the last 12 months, your best round is used as the differential
7-8 rounds, best 2 rounds
9-10 rounds, best 3 rounds
11-12 rounds, best 4 rounds
13-14 rounds, best 5 rounds
15-16 rounds, best 6 rounds
17 rounds, best 7 rounds
18 rounds, best 8 rounds
19 rounds, best 9 rounds
20 rounds in the last year, use the best 10 rounds.
Final Handicap Index Calculation:
Then, we take your average differential of your best rounds and multiply it by .96 to get your Handicap Index.
