Online Tool Store
Golf Handicap Calculator
Enter your score, course rating, and slope rating to calculate the handicap differential for that round. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Handicap differential
Example shown — replace it with your own round's score and course ratings.
How it works
- Enter your round's score, course rating, and slope rating.
- The handicap differential is calculated for that round.
- Combine several rounds' differentials for your full handicap index.
Calculation applies the World Handicap System differential formula: (score − course rating) × 113 ÷ slope rating — the standard per-round building block used before averaging multiple rounds into a full handicap index.
FAQ
Is my score data uploaded anywhere?
No. The calculation happens entirely in your browser — nothing is sent to a server.
What is a handicap differential?
A single round's score adjusted for course difficulty — (score − course rating) × 113 ÷ slope rating — the building block used to calculate an official handicap index from multiple rounds.
Is this my official USGA/World Handicap System index?
No — an official index is the average of your best differentials across multiple recent rounds, calculated by an authorized handicap service. This tool calculates a single round's differential.
Where do I find course and slope rating?
On the scorecard for the course and tees you played, or on the course's official website — both vary by which tees you play from.
How we compare
| Feature | Online Tool Store | Manual formula math | Official handicap service |
|---|---|---|---|
| Quick single-round check | ✓ | Easy to make an arithmetic error | Requires club membership |
| Free, no membership | ✓ | ✓ | Membership fee required |
An official handicap service requires club membership for your certified index. Golf Handicap Calculator gives a quick per-round differential check, free.