Score Differential is the numerical value attributed to a score (Adjusted Gross Score) achieved during a round of golf. It is the value of Handicap Index that has been ‘played to’ for the round on a specific course on a specific day.
It is calculated with an uncomplicated formula and expressed as number rounded to one decimal place. The consecutive Differentials are chronologically registered in the scoring record of a player. They are the basis for calculation of the player’s Handicap Index.
The adjustment of a Handicap Index relies on 18-hole Score Differentials. Therefore 9-hole scores have to be converted into their 18-hole equivalents using one of two methods (in EGA countries both options are used):
- a 9-hole score is scaled up to an equivalent 18-hole Score Differential (option for Great Britain, Ireland and South Africa), or
- a 9-hole score is combined with another 9-hole round Score Differential to create an 18-hole value (option for US, Australia and Argentina).
The calculator below calculates:
- 18-hole Score Differential for 18-hole round, or
- 9-hole Score Differential (for combining with another 9-hole score) and its 18-hole equivalent (for immediate use) for 9-hole round.
The Score Differential is registered in the scoring record of this player as the score of the round for handicap purposes (Handicap Index calculation).
update: January 2021