5.1 Calculation of a Score Differential

5.1a For an 18-hole Score

An 18-hole Score Differential is calculated as follows and rounded to the nearest tenth, with .5 rounded upwards:

Score
Differential 		= (113 ÷
Slope Rating)		 x (adjusted gross score –
Course Rating – PCC adjustment)

Note: The PCC adjustment ranges from -1.0 to +3.0 (see Rule 5.6 Playing Conditions Calculation).

5.1b For a 9-hole Score

If a player submits a 9-hole score, an 18-hole Score Differential must be created by combining two 9-hole Score Differentials.

A 9-hole Score Differential is calculated as follows using 50% of the playing conditions calculation (PCC) adjustment for the day:
Score
Differential 		= (113 ÷
9-hole Slope Rating)		 x (9-hole adjusted gross score –
9-hole Course Rating –
(0.5 x PCC adjustment))

Notes:

  1. A 9-hole Score Differential remains unrounded until after it has been combined with a second 9-hole Score Differential and an 18-hole Score Differential is calculated.
  2. For the calculation of a 9-hole Course Handicap, see Rule 6.1b For a 9-hole Round.
  3. An 18-hole PCC adjustment ranges from -1.0 to +3.0 (see Rule 5.6 Playing Conditions Calculation).

An 18-hole Score Differential is then created by either:

Note: An uncombined 9-hole score will be discarded when it becomes older than the twentieth Score Differential in the scoring record.

5.1c Rounding of Minus Score Differentials

When an adjusted gross score calculates lower than the Course Rating, this results in the Score Differential being a negative number. Where this occurs, rounding is made upward towards 0. For example: