The three WHS formulas you need on course: Course Handicap, Score Differential, and Playing Handicap.
Convert your official handicap index into the extra strokes you receive at today's course.
Your official number. Find it on the GHIN app or GHIN.com (US), or the MyEG app and englandgolf.org (UK).
How hard the course is for an average player. On the scorecard (listed per tee colour). Standard value is 113.
The expected score for a scratch golfer on this course. On the scorecard next to the Slope.
The ideal strokes to complete the course. Usually 72. Also on the scorecard.
Your HI adapted to the specific course. Two courses with the same par can have very different difficulties — the CH corrects this via Slope and Course Rating.
Measures performance in a round regardless of course difficulty. Your HI = average of the best 8 differentials from your last 20 rounds.
The strokes you actually write on your scorecard. Course Handicap adjusted by format percentage: Stableford 95%, match play 90%…
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