Course Handicap vs Handicap Index

A Handicap Index is a single number that travels with a golfer across every course they play, calculated from a rolling record of their recent scores adjusted for the difficulty of the courses those scores came from. It is intentionally course-independent — a snapshot of general demonstrated ability rather than a number tied to any specific set of tees.

Course handicap is what that portable Handicap Index becomes once it is applied to one specific course and tee: it factors in that course's slope rating (and sometimes course rating and par) to produce the actual number of strokes a golfer receives for a round there. Because slope rating varies from course to course, and even tee to tee at the same course, the same Handicap Index can translate into a noticeably different course handicap depending on where it is being played.

This two-step system exists specifically so that a single portable ability number (Handicap Index) can be fairly translated into the right number of strokes for any specific course's actual difficulty (course handicap) — without it, a golfer's handicap would either need to be recalculated entirely for every course, or would fail to properly account for how much harder some courses play than others.