Quick, mobile-optimized calculator designed for on-course use. Calculate your 9-hole handicap differential instantly.
The 9-hole score differential uses the same USGA formula as 18-hole rounds, but with 9-hole specific course and slope ratings. This allows you to track your performance for shorter rounds.
Score Differential = (Score - Course Rating) × 113 / Slope RatingTo establish an official handicap index, you need a minimum of 3 score differentials (can mix 9-hole and 18-hole rounds). Two 9-hole differentials equal one 18-hole differential for handicap index calculation.