Handicap index is a measure calculated to find the potential ability of a golf player in standard playing difficulty. It is calculated based on the handicap differentials (sum and number of differentials). This online calculator is used to find the handicap index of a golf player based on the given values.
Handicap differentials is the difference between the players score and USGA Course Rating adjusted for slope rate. It is calculated using the players score, course rating , slope rate and 113. The sum and average of the differential is used to find the index.