Golf Handicap Calculator
Calculate your handicap differential from a round, the building block of your World Handicap System index.
How to use the golf handicap calculator
- Enter your adjusted gross score for the round.
- Enter the course rating and slope rating from the scorecard.
- Click Calculate to get your score differential.
From a single round to a handicap index
One differential is just one data point. The World Handicap System averages your eight best differentials out of your most recent twenty rounds, so your index reflects your demonstrated potential rather than any single good or bad day.
From one round to a handicap index
A single round produces a score differential, but your official handicap index under the World Handicap System is the average of your best 8 differentials from your most recent 20 rounds. That design rewards demonstrated potential rather than any one lucky or unlucky day.
This calculator gives you the differential for a round, the building block you record after each game. As your differentials improve, your index follows.
Why course and slope rating matter
Shooting 90 on a brutal championship course is a better performance than 90 on an easy local layout, and the differential formula captures that. By factoring in course rating (difficulty for a scratch golfer) and slope rating (relative difficulty for a bogey golfer), your handicap reflects how you played, not just the raw number on the card.
What your handicap index means
| Handicap index | Level |
|---|---|
| Plus (below 0) | Elite — better than scratch |
| 0–9 | Low handicap, very good player |
| 10–18 | Mid handicap, solid club golfer |
| 19–28 | High handicap, still developing |
| 29–54 | Beginner (54.0 is the WHS maximum) |
Your index is portable; the strokes you actually receive depend on the course and tees (your course handicap). The World Handicap System maximum index is 54.0 for both men and women.
Frequently asked questions
How is a golf handicap calculated?
Each round produces a differential: (Score − Course Rating) × 113 ÷ Slope Rating. Your handicap index is the average of your best 8 differentials from your last 20 rounds.
What is slope rating?
Slope rating measures how difficult a course is for a bogey golfer relative to a scratch golfer. The standard average is 113.
How is a golf handicap calculated?
Each round gives a differential of (adjusted score - course rating) x 113 / slope rating. Your index is the average of your best 8 differentials from your last 20 rounds.
What is slope rating?
Slope rating measures how much harder a course plays for a bogey golfer than a scratch golfer. The standard, average value is 113.
How many rounds do I need for a handicap?
You can establish an initial handicap with as few as three 18-hole rounds under the World Handicap System, with the index becoming more stable as you post more scores.
What does my handicap index mean?
Lower is better: a scratch golfer plays off 0, single-digit indexes are very good, and the World Handicap System caps the maximum index at 54.0. The table below maps ranges to skill levels.