Stroke index allocation: 18-hole course

Calculating the net score for a 9-hole round requires the stroke indexes from 1 to 9 assigned to each hole. If the round is played on an 18-hole course (indexes from 1 to 18), an amended stroke index allocation is needed.

The calculator below converts the stroke indexes (SI) of an 18-hole course to a 9-hole round. This is useful when the scorecard does not provide stroke indexes for both individual nines played on an 18-hole golf course.