For an 18-hole score, the simplified formula is (113 ÷ Slope Rating) × (adjusted gross score − Course Rating − playing conditions adjustment). The result is rounded to one decimal place and added to the scoring record.
The Score Differential is not simply the number of strokes over par. It measures the performance against the rated difficulty of the course and tees.
What the formula uses
- Adjusted gross score: the score after applying the maximum-hole-score rules for handicap purposes.
- Course Rating: the expected score for a scratch player in normal conditions.
- Slope Rating: the relative difficulty for non-scratch players compared with scratch players.
- Playing Conditions Calculation: an adjustment applied only when the system identifies unusual scoring conditions.
Worked example
Suppose the adjusted gross score is 92, Course Rating is 71.4, Slope Rating is 128 and the playing-conditions adjustment is 0.
(113 ÷ 128) × (92 − 71.4) = 18.18, which rounds to a Score Differential of 18.2.
To see how differentials feed into the index, return to Golf handicap explained.
Why your app may show a different result
Nine-hole scores, maximum-hole-score adjustments, exceptional-score reductions and other Rules of Handicapping procedures can affect the record. Use the official system’s result rather than attempting to replace it with a personal spreadsheet.
The essential point
A Score Differential adjusts a score for rated course difficulty. The formula makes performances from different courses more comparable before they are used in the Handicap Index.
Sources
The following official or specialist sources were used to verify this independently written guide.
- The R&A – official guidance Source used to verify the rules or factual information in this guide.
- Swiss Golf – official information Source used to verify the rules or factual information in this guide.
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