S&H Seniors Golf League

Calculating Handicaps

The Handicap and Chip-in Pot Committee uses web-based software developed by the League to calculate handicaps. The software follows the USGA Handicap Formula (Section 10) of the USGA Handicap System Manual except that the League has reduced the USGA minimum number of scores for a valid Handicap Index from 5 to 3. This change allows new members to get a handicap sooner for Special Events. Also, the League limits the maximum number of strokes per hole that a member can record on a scorecard to 9 for Open Play while the USGA does not limit the number of strokes per hole when calculating Handicap Indexes.

Only Open Play scores are used to calculate handicaps. Before scores are posted for handicaps, the Handicap and Chip-in Pot Committee adjusts scores on scorecards using the USGA Equitable Stroke Control (ESC) procedure, which minimizes the possibility of distorting a handicap. The following 9-hole modified ESC adjustment is used:

Course Maximum
Handicap Hole Score
4 or less Double Bogey
5 - 9 7
10 - 14 8
15 or more 9

To help with pace of play, the following grey tee markers were moved forward near the cedar tee markers:

Tournament Holes #1, #4 and #7
Baer Holes #1, #2 and #7
Players Hole #9

Handicap Index calculations are based on Handicap Differentials derived from the member’s Adjusted Gross Score and the USGA Course Ratings and Slope Ratings for Schaumburg Golf Club courses listed below:

9-Hole Course Rating/Slope

Tee Tournament Baer Players
Red 32.7/115 32.4/112 32.2/117
Green 34.0/124 33.6/114 33.1/114
    Updated: March 2018

The number of best (lowest) Handicap Differentials to be used to calculate a Handicap Index is determined from the following table:

Posted Differentials
Scores To Be Used
3 - 6 1
7 - 8 2
9 - 10 3
11 - 12 4
13 - 14 5
15 - 16 6
17 7
18 8
19 9
20 10

An example Handicap Index calculation is as follows.

A man's Adjusted Gross Scores for 9-hole rounds from the grey tees were:

51T, 51B, 47T, 55T, 45P, 48T, 50T, 49P, 48B, 52P and 49T

The letters after the scores are for the Baer, Tournament and Players courses.

A Handicap Differential is the difference between a player's Adjusted Gross Score and the Course Rating of the course on which the score was made, multiplied by 113 (USGA standard difficulty Slope Rating), then divided by the Slope Rating from the tees played and rounded to the nearest tenth. Below are the calculated Handicap Differentials for the above Adjusted Gross Scores:

(51T - 32.7) x 113 / 115 = 17.9817 = 18.0
(51B - 32.4) x 113 / 112 = 18.7661 = 18.8
(47T - 32.7) x 113 / 115 = 14.0513 = 14.1
(55T - 32.7) x 113 / 115 = 21.9122 = 21.9
(45P - 32.2) x 113 / 117 = 12.3624 = 12.4
(48T - 32.7) x 113 / 115 = 15.0339 = 15.0
(50T - 32.7) x 113 / 115 = 16.9991 = 17.0
(49P - 32.9) x 113 / 117 = 15.5496 = 15.5
(48B - 32.4) x 113 / 112 = 15.7393 = 15.7
(52P - 32.2) x 113 / 117 = 19.1231 = 19.1
(49T - 32.7) x 113 / 115 = 16.0165 = 16.0

From the above example, the best (lowest) 4 of 11 Handicap Differentials are averaged, multiplied by .96 and the numbers after the tenths are dropped. The result is the player's Handicap Index below:

(14.1 + 12.4 + 15.0 + 15.5) / 4 = 14.25 x .96 = 13.68 = 13.6

The Course Handicap is used in Special Events. A member's Course Handicap is determined by multiplying their Handicap Index by the Slope Rating of the course to be played and then dividing by 113. The results are rounded the nearest whole number (.5 or more is rounded upward). The Course Handicap for the Tournament course would be:

(13.6 x 115) / 113 = 13.840708 = 14

Members' Handicap Indexes and Adjusted Gross Score averages for the last 20 rounds can be found on the Handicaps webpage. Members' Adjusted Gross Scores, Handicap Differentials and 4-week Handicap Differential averages for 40 rounds can be found on the Member Statistics webpage. The 4-week Handicap Differential average can be viewed as a Handicap Differential trend because it includes all differentials not just the best which are used to calculate Handicap Indexes.