This is a single-round differential, not a full handicap index (which averages your best several recent differentials). Use official handicap tracking software for tournament-eligible handicaps.
Free Golf Handicap Calculator
The official USGA/World Handicap System formula averages your best 8 of your last 20 rounds' Score Differentials — this calculator provides a simplified single-round estimate for quick reference; use official handicap tracking software for a tournament-eligible handicap.
Worked Example
Example: Score 92, Course Rating 71.5, Slope Rating 128. Score Differential = (92 − 71.5) × 113/128 = 18.1.
Formula / Method
Score Differential = (Score − Course Rating) × 113 / Slope Rating — this is the core USGA formula per round; official handicap index averages the best several differentials across recent rounds.
Worked Example
Example: Score 92, Course Rating 71.5, Slope Rating 128. Score Differential = (92 − 71.5) × 113/128 = 18.1.
Formula / Method
Score Differential = (Score − Course Rating) × 113 / Slope Rating — this is the core USGA formula per round; official handicap index averages the best several differentials across recent rounds.