Golf Handicap Differential Calculator
Calculate a single round's USGA handicap differential from score and slope. Fast, free, and fully client-side.
Calculator Inputs
How the Golf Handicap Differential Calculator Works
Calculates the USGA handicap differential for a single round of golf, using the core formula published in the USGA Handicap System. This is NOT your official USGA Handicap Index — the real Handicap Index averages the best 8 of your most recent 20 differentials (with further adjustments). This tool only computes the differential contributed by one round, useful for tracking a single score against course difficulty.
Formula
Handicap Differential = (Adjusted Gross Score − Course Rating) × 113 / Slope Rating
113 is the USGA-defined "standard" slope rating, used to normalize every course to a common scale so rounds on different courses can be compared fairly. Course Rating and Slope Rating are printed on the scorecard or course rating sheet for the tees played.
Calculation Example
A round of 92 on a course with a 72.0 Course Rating and 113 Slope Rating: (92 − 72.0) × 113 / 113 = 20.0.
Frequently Asked Questions
Is this my official USGA Handicap Index?
No. Your official Handicap Index is calculated by the USGA/GHIN system from the best 8 of your most recent 20 round differentials, with additional adjustments. This tool only computes the differential for one round — a building block, not the final index.
Where do I find my Course Rating and Slope Rating?
Both are printed on the scorecard or posted on the course's rating sheet, specific to the tees you played. Slope Rating ranges from 55 to 155, with 113 defined as standard/average difficulty.
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