Free WHS Handicap Calculator — Course Handicap & Score Differential | ParPal

Enter your Handicap Index along with the Course Rating, Slope Rating, and Par for the tees you're playing to get your Course Handicap instantly. Switch tabs to work out the Score Differential for a round you just played.

How does a WHS handicap calculator work?

A WHS handicap calculator determines your Course Handicap for a specific set of tees by taking your Handicap Index, multiplying it by the Slope Rating, dividing by 113, and then adding the difference between the Course Rating and Par.

Course Handicap = Handicap Index × (Slope Rating ÷ 113) + (Course Rating − Par)

Worked example: Your Handicap Index is 12.4. You're playing a course with a Slope Rating of 131, a Course Rating of 70.8, and a Par of 71. That works out to 12.4 × (131 ÷ 113) + (70.8 − 71) = 14.4 − 0.2 = 14.2, which rounds to a Course Handicap of 14 strokes for that round.

What's the difference between Handicap Index and Course Handicap?

Your Handicap Index is one portable number that represents your overall demonstrated playing ability — it travels with you everywhere. Your Course Handicap is what your Handicap Index converts to for one specific course and tee combination, so it changes from course to course even though your index stays the same. For the full picture, see How Golf Handicap Is Calculated — The Complete WHS Guide.

What three numbers do you need for a Course Handicap calculation?

Your Handicap Index — calculated from your best 8 of your last 20 score differentials.
Slope Rating — found on the scorecard or course database, specific to the tees you're playing.
Course Rating and Par — also tee-specific, used together to adjust for whether the course plays slightly easier or harder than its par.

Not sure how those two ratings differ? See Course Rating vs Slope Rating — What's the Difference?

How is a Score Differential calculated for a single round?

If you're working backward from a round you just played (rather than calculating a Course Handicap before you tee off), use the Score Differential tab above. The formula is (Adjusted Gross Score − Course Rating) × 113 ÷ Slope Rating. For worked examples, see What Is a Score Differential in Golf?

Why use the official WHS formula instead of a generic calculator?

Not every "golf handicap calculator" online uses the actual WHS formula correctly. Some apply outdated pre-2020 regional systems, skip the Net Double Bogey cap on Adjusted Gross Score, or don't account for the 9-hole expected-score conversion introduced in 2024. This calculator uses the current, official World Handicap System formula — the same one used by the USGA, The R&A, and every WHS-authorized golf association globally.

Do you have to calculate this manually every round?

No — that's the entire point of an app like ParPal. While this calculator is useful for a quick one-off check, ParPal calculates your Course Handicap automatically for every course you play, pulls the correct Course Rating and Slope Rating for your tees from its course database, and updates your Handicap Index the moment you post a round.

Frequently Asked Questions

How do I calculate my WHS handicap?

Your Handicap Index is calculated from the best 8 of your last 20 score differentials. To convert that index into a Course Handicap for a specific round, multiply your index by the course’s Slope Rating, divide by 113, and add the difference between Course Rating and Par.

Is there a free WHS handicap calculator?

Yes — official tools are available through the USGA and The R&A, and the calculator above uses the same official formula. ParPal also calculates this automatically, free, every time you log a round.

What’s my Course Handicap if I shoot 82?

Your Course Handicap doesn’t come directly from a single score — it comes from your Handicap Index, which is built from your best 8 of your last 20 score differentials. A single round of 82 contributes one differential to that calculation but isn’t, by itself, your Course Handicap.

Do I need different calculators for 9-hole and 18-hole rounds?

No — the same formula applies. For 9 holes, you halve your Handicap Index first, then use the 9-hole Course Rating, Slope Rating, and Par for your tees in the same formula.

Why does my Course Handicap change at every course?

Because Course Rating and Slope Rating are different at every course (and even at every set of tees within the same course), your Course Handicap recalculates for each one — even though your underlying Handicap Index stays the same.

WHS Handicap Calculator: Calculate Your Course Handicap