Have handicap index Need to calculate course handicap Use Contorra's Course Handicap Calculator for iPhone and iPod Touch. Enter your handicap index and course slope and see course handicap instantly. Slider for quick course slope entry. Remembers your inputs. Official USGA formula. Also calculates ESC (Equitable Stroke Control) - maximum number of strokes allowed per hole. Works on iPhone, iPhone 3G, iPhone 3GS and iPod Touch. It's FREE!