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Handicap Calculation

Using Course Rating and Slope

If you DO NOT HAVE "Use Course Rating" turned on for your league, then Golf League Tracker will base all handicap calculations against par, and this article does not apply!

Overview

Golf League Tracker will automatically calculate handicaps for a round of golf based on several settings that you configure for your league. In order to calculate proper course handicaps, you must insure the following

  1. Each course has the proper rating/slope entered for each tee box, and for each indivdual 9 holes
  2. The correct Default Teebox is set
  3. Each player is assigned to the correct teebox

Calculating a Handicap Index

When "Use Course Rating" is turned on for your league, then a player's handicap is calculated from the course rating and slope for the tee box used by the player. A "differential" is calculated for each score for a player using the USGA formula:

Differential = (Score - Course Rating) * 113 / Course Slope

The number of differentials used are then averaged according to your league settings, and a "Handicap Index" is generated for a player. (note: if you click on a player's handicap in the player list you can see a detailed calculation of the player's index).

Converting an Index to a Course Handicap

Once a player has a handicap index, that index is used to calculate a "Course Handicap" for the player. The Course Handicap is the handicap used for the player when (s)he plays a round. To calculate the Course Handicap, the steps are essentially reversed, using the slope for the tee box the player is assigned to:

Course Handicap = Handicap Index * Course Slope / 113

Adjusting Course Handicap With Multiple Tee Boxes

If you play from more than one tee box, that's not the end of the calculation. You must adjust the course handicap for a player using the differences in the course rating between the tee boxes.

This is where the "default tee box" comes into play.

Golf League Tracker needs to know which tee box is the "baseline" for the calculation. It is suggested you set the Default Teebox to the tees which most of the players play from, but this is not required. Players who are assigned to the Default Teebox will not have their Course Handicaps adjusted, but all other players will be adjusted from that Default Teebox

Example 1

You have 3 tee boxes in use, Red, White, and Blue, and you're playing the front 9 of your course. The default tee box is the White tees

Tee Box Name Gender Rating Slope Default
Red F 33.5 130
White M 34.6 128 Y
Blue M 36.4 145

Now we will calculate each player's Course Handicap based on the tee box they're assigned to. You must make sure each player is assigned to their correct tee box in order for the course handicap to be displayed correctly on the schedule, scorecards, and when entering scores.

Player Name Tee Box Handicap Index Slope Course Handicap=
Index * Slope / 113
(Before Rating Adjustment)
Diane Red 11.2 130 13
Chris White 8.5 128 10
Jim White 16.7 128 19
Bob Blue 2.9 145 4

Once we have the Course Handicap calculated, we then have to adjust the Course Handicap based on the difference in the ratings for each tee box, using the Default Teebox rating for a baseline. In this example, the White tees (34.6) is the baseline. The difference in the tees in this case are:

After the adjustment is made, the handicap is rounded to the nearest whole number a second time.

Player Name Tee Box Handicap Index Course Handicap
Index * Slope / 113
(Before Rating Adjustment)
Rating
Difference
Course Handicap
(After Rating Adjustment)
Diane Red 11.2 13 -0.9 12
Chris White 8.5 10 0 10
Jim White 16.7 19 0 19
Bob Blue 2.9 4 +1.8 6

Example 2

You have 3 tee boxes in use, Red, White, and Blue, and you're playing the front 9 of your course. Most players are playing the blue tees, so that is your Default Tee Box.

Tee Box Name Gender Rating Slope Default
Red F 33.5 130
White M 34.6 128
Blue M 36.4 145 Y

Now we will calculate each player's course handicap based on the tee box they're assigned to. You must make sure each player is assigned to their correct tee box in order for the course handicap to be displayed correctly on the schedule, scorecards, and when entering scores.

Player Name Tee Box Handicap Index Slope Course Handicap=
Index * Slope / 113
(Before Teebox Adjustment)
Diane Red 11.2 130 13
Chris White 8.5 128 10
Jim White 16.7 128 19
Bob Blue 2.9 145 4

Now we calculate the difference of tee box ratings, this time using the Blue tee box as our baseline.

Red Tees are -2.9 (lower) than blue (33.5-36.4)
White Tees are -1.8 (lower) than the blue (34.6-36.4)

After the adjustment is made, the handicap is rounded to the nearest whole number

Player Name Tee Box Handicap Index Course Handicap=
Index * Slope / 113
(Before Teebox Adjustment)
Rating
Difference
Course Handicap=
(After Teebox Adjustment)
Diane Red 11.2 13 -2.7 10
Chris White 8.5 10 -1.8 8
Jim White 16.7 19 -1.8 17
Bob M 2.9 4 0 4

One thing you will notice is that the relative difference between the players is the same number of strokes regardless of which tee box is used as a baseline. If your league is match play, then it doesn't matter which baseline is used, however if you play Net Skins, or your league is a format such as Stableford, then it matters in your results what a player's full handicap is.

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