Get your most recent golf scores
Find the course rating for each round
Find the slope rating for each round
Subtract the course rating from each score
Multiply the result by 113
Divide by the slope rating
Record the handicap differential for each round
Select the lowest handicap differentials
Average the selected differentials
Multiply the average by 0.96
Round the result to one decimal place
Use the final number as your handicap index
Adjust the handicap index for the course being played if needed