Your Handicap
Index®
Your official USGA Handicap Index® is more than a number — it's your identity as a golfer. It lets you compete fairly with anyone, anywhere in the world, on any course. Every serious golfer has one. Here's everything you need to know.
Handicap Index®
How Your Index Is Calculated
Your Handicap Index® is calculated using your best 8 Score Differentials out of your most recent 20 rounds. A Score Differential measures how your adjusted gross score compares to the difficulty of the course you played that day.
The system accounts for both Course Rating™ (expected score for a scratch golfer) and Slope Rating® (relative difficulty for a bogey golfer vs. scratch). This means your index is fair regardless of which course you're playing.
A Playing Handicap is then calculated from your index for a specific set of tees on a specific course — so your strokes are always proportional to the challenge in front of you.
(Adjusted Gross Score − Course Rating) × 113 ÷ Slope Rating
Your Handicap Index = Average of best 8 of last 20 differentials.
Yes. The Rules of Handicapping require that you post every eligible round — good, bad, or ugly. Selectively posting only good rounds inflates your handicap and undermines the fairness of the system. The USGA's system is specifically designed to use only your best differentials, so posting a bad round won't hurt you as much as you might think.
You need a minimum of 54 holes of acceptable scores posted (typically 3 rounds of 18, or equivalent 9-hole combinations). Once those are in the system, your initial Handicap Index® will be calculated on the next daily revision. From that point forward it updates every morning.
An exceptional score is one that's significantly better than your current Handicap Index® — typically 7.0 or more strokes better. When this happens, the USGA system applies a soft cap and in extreme cases a hard cap that limits how high your index can rise after an exceptional round. This prevents sandbagging (artificially maintaining a high handicap).
Yes. 9-hole scores are fully acceptable and count toward your Handicap Index®. Two 9-hole scores can be combined into an 18-hole differential. This makes it easy to maintain an active index even when you can only squeeze in a short round. Post every 9-hole score through the GHIN app just as you would an 18-hole score.
Under the World Handicap System, the maximum Handicap Index® is 54.0 for all golfers. This replaced the previous system where men and women had different maximums. The 54.0 ceiling ensures that beginners and high-handicap golfers can participate meaningfully in any competitive format.
Your Handicap Index® remains on record indefinitely — it doesn't expire. However, if you haven't posted any scores in over a year, your record may be flagged as inactive by your club or association. When you return to play, simply start posting scores again and your index will update normally. Your score history is preserved.
Yes — that's the whole point of the Course Rating™ and Slope Rating® system. Shooting 85 on a difficult course with a high Course Rating produces a better (lower) Score Differential than shooting 85 on an easy course. The math automatically adjusts for course difficulty, so your index accurately reflects your ability regardless of which courses you play.
Get Your Official
Handicap Index® Today
AGA membership is free for juniors and affordable for all golfers. Join today, download the GHIN app, post your first round, and start building the index that follows you everywhere golf takes you.