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 works right here on your device — nothing gets sent out.
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.