Estimate your golf handicap index from your recent round scores, course rating, and slope rating, using a simplified version of the USGA formula.
The official USGA/World Handicap System averages your best score differentials from your last 20 rounds, with the exact number of rounds used depending on how many you've played. This calculator uses a simplified version based on the rounds you enter.
113 is the "standard" slope rating used as a baseline, and the 0.96 multiplier is applied by the official system as a slight downward adjustment.
Is this an official USGA handicap? No — this is a simplified estimate for personal reference. An official World Handicap System index requires posting scores through an authorized golf association or club.
What's a course slope rating? Slope rating measures the relative difficulty of a course for a bogey golfer compared to a scratch golfer, ranging from 55 to 155, with 113 representing standard difficulty.
What's a good golf handicap? A single-digit handicap (0-9) is considered advanced, 10-18 is solid intermediate, and most recreational golfers fall somewhere between 15 and 25.
How many rounds does the official system use? The World Handicap System uses up to your best 8 of your last 20 scores, updated daily as you post new rounds — this calculator simplifies that to whatever rounds you enter here.
Suppose you shoot 90 on a course with a rating of 71.5 and a slope of 125. Your score differential is (90 − 71.5) × 113 ÷ 125 = 16.7. The slope figure of 113 represents a course of average difficulty, so the formula adjusts your score for how hard the tees you played actually are. Your handicap index is built from your better differentials, which is why one bad day does not ruin it.
| Term | Meaning |
|---|---|
| Handicap index | Your portable measure of ability, not tied to one course. |
| Course handicap | The number of strokes you receive on a specific course and set of tees. It is roughly your index × slope ÷ 113, with a further adjustment under the World Handicap System for the gap between course rating and par. |
| Net score | Your gross score minus your course handicap. |
Why does a harder course give a lower differential for the same score? A higher course rating and slope mean the course is tougher, so the same score represents a stronger performance and the differential comes out lower.
Can I use scores from different tees? Yes, as long as you enter the correct rating and slope for each round, because each tee set has its own values.