How this calculation works
The Golf Score Differential & Handicap Calculator computes your single-round score differential under the official World Handicap System (WHS) and USGA rules.
Mathematical formula and logic
Score Differential = (113 / Slope Rating) × (Adjusted Gross Score - Course Rating - PCC). Handicap Index = Average of best 8 differentials out of last 20 rounds.
Worked example
A round of 85 on a golf course with a 71.5 Course Rating and 125 Slope Rating produces a Score Differential of (113 / 125) × (85 - 71.5 - 0) = 12.20.
Calculation assumptions
- World Handicap System (WHS) standard formula adopted worldwide in 2020.
- Standard neutral course slope rating baseline is 113.
Frequently asked questions
What is the difference between Course Rating and Slope Rating?
Course Rating reflects the score an expert scratch golfer (0 handicap) should shoot. Slope Rating (55 to 155) measures how much harder the course is for a bogey golfer relative to a scratch golfer.
How is a World Handicap System (WHS) Index calculated?
Your official WHS Handicap Index is calculated by taking the arithmetic average of your lowest 8 score differentials from your most recent 20 submitted 18-hole rounds.
What is a 'scratch golfer'?
A scratch golfer is an accomplished player with a Handicap Index of 0.0 who can shoot even par on rated courses.
What is maximum handicap allowed in WHS?
Under the World Handicap System, the maximum Handicap Index for both men and women is 54.0.
What is Course Handicap vs Handicap Index?
Handicap Index is your portable overall skill number. Course Handicap is the number of strokes you receive on a specific golf course tee box: Course Handicap = Handicap Index × (Slope Rating / 113) + (Course Rating - Par).
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