Golf Handicap Calculator
Calculate your World Handicap System index from your score differentials, a score differential from a single round, and your course handicap. Example: ten differentials with the best three averaging 12.3 give a 12.3 index, which is a 13 course handicap on a slope 125 course.
Show steps
How to use the Golf Handicap Calculator
- List your recent score differentials, up to your last 20, separated by commas.
- Enter the course rating, slope and par for the course you will play.
- Optionally enter an adjusted gross score to see that round’s differential.
- Press Calculate for your index, course handicap and target score.
Formula and method
Score differential = (113 / slope) x (adjusted gross score – course rating). Handicap index = average of the lowest differentials from your last 20 rounds (the best 8 once you have 20). Course handicap = index x slope / 113 + (course rating – par).
Worked example
| Step | Result |
|---|---|
| 10 differentials, best 3 used | 11.9, 12.1, 12.8 |
| Average | 12.27 |
| Handicap index | 12.3 |
| Course handicap (slope 125, rating 71.5, par 72) | 13 |
| Differential for a score of 88 | 14.9 |
How many scores count
| Rounds | Differentials used | Adjustment |
|---|---|---|
| 3 | Lowest 1 | -2.0 |
| 4 | Lowest 1 | -1.0 |
| 5 | Lowest 1 | 0 |
| 6 | Average of lowest 2 | -1.0 |
| 7 to 8 | Lowest 2 | 0 |
| 9 to 11 | Lowest 3 | 0 |
| 12 to 14 | Lowest 4 | 0 |
| 15 to 16 | Lowest 5 | 0 |
| 17 to 18 | Lowest 6 | 0 |
| 19 | Lowest 7 | 0 |
| 20 | Lowest 8 | 0 |
Slope and course rating
Course rating is the score an expert golfer should shoot. Slope measures how much harder the course plays for a bogey golfer, from 55 to 155 with 113 as average. Both appear on the scorecard.
Frequently asked questions
How do I calculate a golf handicap?
Convert each round to a score differential, then average the lowest 8 of your last 20 differentials.
What is a score differential?
(113 / slope) x (adjusted gross score – course rating).
What is a course handicap?
The strokes you get on a specific course: index x slope / 113 + (course rating – par).
How many rounds do I need?
At least 3 for an index under the World Handicap System.
What is slope rating?
A 55 to 155 number showing course difficulty for bogey golfers. 113 is average.
Is this my official handicap?
No. Your golf association or club issues official indexes.
Sources
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