A USGA Course Rating of 74.8 means that 74.8 is expected to be the average score of the best 50-percent of rounds played by scratch golfers (Tama Hills white tees, Korai greens is 68.6).
Slope rating is a number representing the relative difficulty of a course for bogey golfers compared to course rating. Slope can range from 55 to 155, with 113 being considered a course of average difficulty (Tama Hills white tees, Korai greens is 117).
Equitable Stroke Control Chart
Course Handicap |
Maximum Score |
0-9 |
Double Bogey |
10-19 |
7 |
20-29 |
8 |
30-39 |
9 |
40 or more |
10 |
By Differentials
A handicap differential is the difference between the adjusted gross score and the NCGA/USGA Course Rating, multiplying the difference by 113, dividing the results figure by the NCGA/USGA Slope Rating and rounding off to the nearest tenth. The following is an example for a course with a 71.5 Course Rating and a 130 Slope Rating.
Adjusted gross score |
95 |
Course Rating |
71.5 |
Difference |
23.5 |
Handicap Differential |
113 x 23.5 divided by 130 = 20.4 |
The value 113 in the above formula is the national standard for Slope Ratings and is used to weigh differentials.
Lowest 10 of Last 20 Differentials. The INDEX is computed from the lowest 10 of the player's last 20 rounds as follows:
Total of 10 lowest differentials |
147.9 |
Total averaged |
14.79 |
Total multiplied by 96% |
14.19 |
Delete all numbers after the tenths digit |
14.1 |
NCGA/USGA Handicap Index is |
14.1 |
If you have fewer than 20 differentials available:
|
Available |
Used |
1-4 |
No INDEX issued |
5 or 6 |
Lowest 1 |
7 or 8 |
Lowest 2 |
9 or 10 |
Lowest 3 |
11 or 12 |
Lowest 4 |
13 or 14 |
Lowest 5 |
15 or 16 |
Lowest 6 |
17 |
Lowest 7 |
18 |
Lowest 8 |
19 |
Lowest 9 |
