Golf Handicap Differential Calculator Formula
Understand the math behind the golf handicap differential calculator. Each variable explained with a worked example.
Formulas Used
Handicap Differential
differential = (adjusted_score - course_rating) * 113 / slope_ratingStrokes Over Course Rating
over_par = adjusted_score - course_ratingVariables
| Variable | Description | Default |
|---|---|---|
adjusted_score | Adjusted Gross Score | 88 |
course_rating | Course Rating | 72.1 |
slope_rating | Slope Rating | 131 |
How It Works
Golf Handicap Differential
The handicap differential normalizes scores across courses of different difficulty using the USGA/WHS formula.
Formula
Differential = (Adjusted Score - Course Rating) x 113 / Slope Rating
113 is the standard slope rating. A course with slope 131 is harder than standard, so the formula adjusts the differential downward. Your handicap index is the average of your best differentials (best 8 of last 20 rounds).
Worked Example
Score of 88 on a course rated 72.1 with slope 131.
- 01Over rating = 88 - 72.1 = 15.9
- 02Differential = 15.9 x 113 / 131 = 13.7
Frequently Asked Questions
What is a good handicap?
Average male golfer: 14-16. Average female: 28-30. Single digit (below 10) is well above average. Scratch golfer is 0, and plus handicaps are below par players.
What is slope rating?
Slope rating (55-155) measures course difficulty for bogey golfers relative to scratch golfers. Higher slope means the course is disproportionately harder for higher-handicap players.
How many rounds do I need?
Under the World Handicap System, you need at least 54 holes (3 rounds of 18) to establish a handicap index.
Learn More
Guide
Golf Handicap Guide - How the Handicap Index System Works
Learn how the golf handicap index is calculated under the World Handicap System. Covers handicap differentials, course rating, slope rating, and playing handicap.
Ready to run the numbers?
Open Golf Handicap Differential Calculator