World Handicap System (WHS) Calculator
Enter up to your most recent 20 rounds. For each round, provide your Adjusted Gross Score, Course Rating, and Slope Rating. The calculator computes score differentials and returns your estimated Handicap Index.
You need at least 3 rounds. Standard slope range is 55 to 155.
| Round | Adjusted Gross Score | Course Rating | Slope Rating |
|---|
How this golf handicap calculator works
This tool follows the modern World Handicap System method. Instead of just averaging scores, it converts each round into a score differential so rounds from different courses can be compared fairly. A tough course and an easier course are normalized by Course Rating and Slope Rating.
The score differential formula used here is:
Differential = (Adjusted Gross Score − Course Rating) × 113 ÷ Slope Rating
Then, based on how many rounds you have posted, the system averages a certain number of your lowest differentials (with a small adjustment for very short scoring records).
What inputs you should use
1) Adjusted Gross Score
Use your adjusted score for the round, not always the raw number on your card. In official posting systems, hole-by-hole maximum adjustments may apply.
2) Course Rating
This is the expected score for a scratch golfer from the tees you played. It often looks like 71.4, 69.8, 73.1, and so on.
3) Slope Rating
Slope reflects relative difficulty for a bogey golfer compared with a scratch golfer. Typical values are between 113 (standard difficulty) and about 155 (very difficult).
How many differentials are used?
WHS uses more differentials as your scoring record grows. This calculator applies the common schedule below:
- 3 rounds: lowest 1 differential, minus 2.0 adjustment
- 4 rounds: lowest 1 differential, minus 1.0 adjustment
- 5 rounds: lowest 1 differential
- 6 rounds: lowest 2 differentials, minus 1.0 adjustment
- 7–8 rounds: lowest 2 differentials
- 9–11 rounds: lowest 3 differentials
- 12–14 rounds: lowest 4 differentials
- 15–16 rounds: lowest 5 differentials
- 17–18 rounds: lowest 6 differentials
- 19 rounds: lowest 7 differentials
- 20 rounds: lowest 8 differentials
Why your handicap may differ from an official app
This page gives a practical estimate and is great for planning, practice goals, and understanding the math. Official systems may also apply PCC (Playing Conditions Calculation), exceptional score reductions, and local association rules. Those extra factors can create small differences.
Tips to improve your handicap faster
- Track fairways hit, greens in regulation, and up-and-down percentage.
- Focus practice on approach shots from your most common distances.
- Reduce penalty strokes first; doubles and triples are index killers.
- Play from appropriate tees to produce realistic scoring opportunities.
- Post every eligible round so your index reflects current skill.
Quick FAQ
Is a lower handicap better?
Yes. Lower means stronger scoring relative to course difficulty.
Can handicap be negative?
Yes. Elite players can have a plus handicap index (often shown with a plus sign in official systems).
Do I need 20 rounds?
No. You can start with 3 rounds, but accuracy and stability improve as you add more scores.