Handicap Calculation for Andrew Towell for Week 19

Week of Rounds Used:		13	4	3		Total		Average		90%		Rounded to:
Gross Score:		48	52	58		158		52.67
Hdcp Score (over Par):		13	15	20		48		16.00		14.40		14

What does this mean? How are handicaps calculated?
Handicap Projection for Andrew Towell for Week 20

If your next round score is:		Your new Handicap will be:
51-56		12
57-61		13
62-67		14
68-73		15
74-78		16