Work out golf course rating differential instantly with clear inputs, formula shown and shareable results.
The World Handicap System differential is (adjusted gross score - course rating) x 113 / slope rating, where 113 is the slope of a course of standard difficulty. The slope adjustment is what makes a round on a hard course worth the same as an easier round elsewhere, so a differential travels between courses while a raw score does not.
Score differential
differential = (adjusted gross score - course rating) x 113 / slope rating
differential = (adjusted gross score - course rating) x 113 / slope rating. The World Handicap System differential is (adjusted gross score - course rating) x 113 / slope rating, where 113 is the slope of a course of standard difficulty.
The slope adjustment is what makes a round on a hard course worth the same as an easier round elsewhere, so a differential travels between courses while a raw score does not.
Enter adjusted gross score, course rating, slope rating. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.