Enter the course rating, slope and adjusted gross score: (Default figures are already there).

The course rating.............
The course slope..............
The adjusted gross score..
The calculated Day Index....

Day Index ( Handicap Differential ) = ( Gross Score - Course rating ) * 113 / Course Slope.
Handicap Index = ( (The aggregate of best 8 day indexes out of most recent 20 day indexes) / 8 ).

 Equitable Stroke Control Table  
18-hole Course Handicap     9-hole Course Handicap Maximum Score Posted on any hole
9 or less 4 or less Double Bogey
10 through 19 5 through 9 7
20 through 29 10 through 14 8
30 through 39 15 through 19 9
40 and above 20 and above 10