Golf Handicap Calculator (World Handicap System)
WHS golf handicap calculator. Differential = (Score − Course Rating) × 113 / Slope. Handicap Index = average of best 8 of last 20 rounds.
Golf Handicap (WHS)
Minimum 3 rounds. Course Rating defaults to 72, Slope to 113 if omitted. Use Adjusted Gross Score (max double bogey + handicap strokes per WHS rules).
| Course Handicap (for entered course) | — |
| Rounds used / best-of formula | — |
| Best differentials averaged | — |
| WHS index cap | Maximum 54.0 (men + women) |
How to use the WHS handicap calculator
Post your scores
Enter your latest rounds (up to 20) one per line. Format: score, course rating, slope. If you omit course rating + slope, defaults of 72.0 / 113 are used (standard course assumption). Use Adjusted Gross Score — WHS caps each hole at "net double bogey" (par + 2 + handicap strokes received on that hole).
Read your Handicap Index
WHS averages the best 8 differentials from your last 20 posted rounds. With fewer rounds, the formula uses a smaller best-of pool with an adjustment factor: 3 rounds → best 1 minus 2.0; 4 rounds → best 1 minus 1.0; 5 rounds → best 1; etc. Maximum Handicap Index is 54.0 (since the 2020 unification of men + women caps).
Convert to Course Handicap
For any course you play, Course Handicap = Index × (Slope / 113) + (Course Rating − Par). This is the number of strokes you receive on that specific course. A Slope 145 course makes the same Index produce a higher Course Handicap because the course plays harder.
For tournament play, apply Playing Handicap
Many tournaments use Playing Handicap = Course Handicap × handicap allowance (often 95% for stroke play, 90% for four-ball, etc., per WHS allowance tables). This calculator stops at Course Handicap — apply your event's allowance separately.
Post all rounds, not just good ones
WHS requires posting every acceptable score (Stableford net-double-bogey adjusted, on-course or simulator with GHIN-rated facility). Selective posting violates the spirit of the system and skews your Index downward, which hurts you in net competitions when you can't play to it.
The World Handicap System — one number, every course on earth
Before 2020, golf had six major handicap systems running in parallel — USGA (Americas), CONGU (UK + Ireland), Golf Australia, EGA (Continental Europe), South African Golf Association, and Argentina\'s AAG. They produced incompatible numbers: a 12-handicap in the USA was not the same player as a 12-handicap in the UK. The R&A and USGA spent five years unifying these systems into the World Handicap System (WHS), launched globally in January 2020. Every golfer in every country now uses the same formula: Handicap Index from the average of the best 8 of your last 20 score differentials, where each differential = (Adjusted Gross Score − Course Rating) × 113 / Slope Rating.
The two ratings that drive everything
Course Rating = expected score for a scratch golfer on that specific course + tee. Slope Rating = how much harder the course plays for a bogey golfer vs scratch. Range 55-155, standard is 113. A Slope of 130 means the course plays ~15% harder for the average golfer. Both ratings are determined by trained USGA/R&A raters who measure landing zones, hazards, green difficulty, and effective playing length adjusted for elevation, wind exposure, and altitude. Without these ratings, comparing scores across courses is meaningless.
"Handicap is a measure of demonstrated ability, not potential." — R&A Rules of Handicapping. Your Index reflects what you actually shoot, not what you could shoot on a great day. That\'s why WHS uses the best 8 of 20, not your record best.
Why "best 8 of 20"?
The pre-WHS USGA system used best 10 of 20 (× 0.96 trend adjustment). WHS tightened to best 8, reasoning that 40% of your rounds is closer to your "true potential under good conditions" than 50%. This makes the Index more representative of recent good play — a player\'s recent improvement (or decline) shows up faster. The Soft Cap (+3 from low Index in 365 days adds 50% above; Hard Cap +5 prevents further rise) and Exceptional Score Reduction (rounds ≥ 7 strokes below Index trigger an automatic Index reduction) prevent both upward sandbagging and rare-good-round manipulation.
ASEAN golf context
Singapore Golf Association, Malaysian Golf Association, Royal Thai Golf Association, and Philippines Golf Association all adopted WHS in January 2020. Singapore SGA uses online GHIN-compatible posting via the SGA portal. Malaysia uses the WHS-compliant MGA-Golf app for posting. Indonesia and Thailand rely on club-by-club WHS systems through their national golf federations. Course rating differences across ASEAN are substantial: Sentosa Serapong plays Slope 138 from the back tees, Bangkok\'s Alpine Golf Club plays Slope 122. The WHS makes scores from any of these comparable — a 90 at Serapong is statistically better than a 90 at Alpine.
10 Things to Know About WHS Handicaps
Differential = (Score − CR) × 113 / Slope. The universal currency of golf.
Handicap Index = average of best 8 of last 20 differentials.
Slope 113 = standard course difficulty. Range 55–155.
Maximum Handicap Index: 54.0 for both men and women (since WHS 2020).
Course Handicap = Index × (Slope / 113) + (CR − Par).
Adjusted Gross Score caps each hole at net double bogey.
Soft cap kicks in 3 strokes above 365-day low Index (50% above gets credited).
Hard cap: max +5 above 365-day low (prevents runaway increase).
"Exceptional Score Reduction" automatically lowers Index after a 7+ below-Index round.
Worldwide single system since January 2020 — R&A and USGA partnership.
Frequently asked questions
Your actual score with each hole capped at "net double bogey" — par + 2 + any handicap strokes received on that hole. Prevents one disaster hole from inflating your handicap. Most golf apps (GHIN, MyEG, SGA) compute this automatically when you post hole-by-hole scores.
113 is the Slope Rating of a "standard" course. Dividing by Slope normalizes scores to that reference — a 90 on a Slope-130 course is "easier than a 90 on standard". The 113 anchor lets one Handicap Index travel anywhere in the world.
No — Handicap Index represents your potential, not your average. Statistically you only play to your Index in 20-25% of rounds. WHS is built on the best 8 of 20, which is closer to your potential ceiling than your typical score.
Handicap Index is portable, course-agnostic. Course Handicap is Index × (Slope / 113) + (CR − Par) for a specific course and tee — the actual stroke allocation for that round.
Yes. WHS combines two 9-hole rounds into one 18-hole score for handicap purposes. The 9-hole score is converted using the 9-hole CR and Slope, then added to your next 9-hole round to form a complete differential.
Standard rules apply: post the score you would have written down in stroke play, using net double bogey caps where you picked up. Match play rounds where you conceded a hole still produce a postable score using "most likely" strokes.
Playing Conditions Calculation. WHS adjusts your differential up or down based on how the field scored on the same day — if conditions were brutal (wind, rain, fast greens), PCC adds a stroke or two to everyone\'s differential. Computed automatically by the national association from posted scores.
No. All scores stay in your browser.
This calculator gives you the core WHS formula. Your official Index from your national association may apply PCC adjustments (daily playing conditions), Exceptional Score Reduction, and Soft/Hard caps that this tool doesn\'t. Use this for estimation; trust your association for the official number.
R&A + USGA "Rules of Handicapping 2024" — definitive 100-page reference, free PDF download. Singapore Golf Association WHS portal. USGA Course Rating System manual for the rating methodology. World Handicap System player education videos at usga.org / randa.org.
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