Golf Handicap Calculator (World Handicap System)
WHS golf handicap calculator. Score Differentials rounded to a tenth, Handicap Index from the Rule 5.2a table (lowest 8 of the most recent 20), capped at 54.0, then Course and Playing Handicap.
Golf Handicap (WHS)
One 18-hole round per line, oldest at the top: only the bottom 20 lines count. At least 3 rounds. A line without a Course Rating or Slope uses 72.0 and 113, and the result names those lines. Enter the adjusted gross score (each hole capped at net double bogey); this tool does not apply that cap for you.
| Course Handicap (course entered) | — |
| Playing Handicap (format chosen) | — |
| Rounds used (Rule 5.2a) | — |
| Lowest differentials averaged | — |
| Lines that used 72.0 / 113 | — |
An estimate from the Rules, with PCC taken as 0 and no caps or exceptional-score reductions. Only your national association's system issues an official Handicap Index.
How to use the WHS handicap calculator
Post your scores, oldest first
Enter up to 20 recent rounds, one per line, with the most recent at the bottom: score, course rating, slope. A line without the two ratings uses 72.0 / 113, and the result lists which lines did. Use the adjusted gross score: once you hold an Index, each hole is capped at net double bogey (par + 2 + the strokes you receive there); for the first scores towards an Index the cap is par + 5 (Rule 3.1).
Read your Handicap Index
Each round becomes a Score Differential, (113 ÷ Slope) × (score − Course Rating), rounded to the nearest tenth. With 20 scores the Index is the average of the lowest 8, rounded to a tenth; with 3 to 19 the Rule 5.2a table picks a smaller pool, with an adjustment for 3, 4 and 6 scores. No Index goes above 54.0 (Rule 5.3).
Convert to Course Handicap
For the tee you are playing, Course Handicap = Index × (Slope ÷ 113) + (Course Rating − Par), rounded to a whole number with .5 rounded up. A higher Slope gives the same Index more strokes.
Pick the format for a Playing Handicap
In a competition the Playing Handicap is the unrounded Course Handicap times the handicap allowance, then rounded (Rule 6.2a). The menu holds the allowances Appendix C recommends: 95% for individual stroke play or Stableford, 85% for four-ball stroke play or Stableford, 100% for individual match play and 90% for four-ball match play. Your national association sets the allowances, or delegates that to a region or club, so check the event's terms.
Read a plus handicap
A Handicap Index better than scratch is shown with a plus sign, as Interpretation 5.2c/1 asks: +1.2, not −1.2. A plus Playing Handicap rounds towards zero (Appendix C), so +1.5 shows as +1 and +0.5 as 0; this tool rounds a plus Course Handicap the same way, .5 upwards as Rule 6.1a says.
The World Handicap System — one number, every course on earth
The R&A and the USGA publish the World Handicap System as the Rules of Handicapping. Their release of 4 November 2019 said the system would "go live gradually from country to country" through 2020, so there was no single launch day. The current text is the 2024 revision, which took effect in the United States on 16 January 2024. Its core is one formula: a Score Differential of (113 ÷ Slope Rating) × (adjusted gross score − Course Rating − PCC) for each round, rounded to the nearest tenth, and a Handicap Index from the lowest differentials of your most recent 20.
The two ratings that drive everything
Course Rating is the expected score for a scratch player on that course and tee. Slope Rating sets how many strokes an Index is worth on that tee; a tee of standard relative difficulty has a Slope of 113. On a Slope-130 tee the Index is multiplied by 130 ÷ 113, so it is worth about 15% more strokes than on a Slope-113 tee, before the Course Rating − Par term is added. Under Appendix G the Authorized Association of each country issues these ratings: the Singapore Golf Association keeps a public registry of its course raters, and the Malaysian Golf Association lists rating the courses of its affiliated clubs among its committee's functions.
Why the lowest 8 of 20?
An Index averages your better rounds, not all of them, so it describes what you can play to rather than your typical score. Two guard-rails sit on top once you have 20 scores and so a Low Handicap Index for the past 365 days (Rules 5.7 and 5.8): the soft cap credits only 50% of any rise beyond 3.0 strokes above that low, and the hard cap stops the Index 5.0 strokes above it. There is no limit on how far an Index can fall. An Exceptional Score Reduction (Rule 5.9) takes 1.0 off for a differential 7.0 to 9.9 strokes better than the Index and 2.0 for 10.0 or more.
Singapore and Malaysia
The Singapore Golf Association describes itself as "the Authorised Association for the administration of the World Handicap System in Singapore" and runs its Centralised Handicapping System (CHS); its 2026 operating procedure leaves the decision to issue an Index to each Club Handicap Committee. In Malaysia the MGA runs its National Handicapping System app, introduced for the move from the USGA system to the WHS. Course Rating and Slope still change from tee to tee, and the differential corrects for that: at the same Course Rating, the same 90 produces a lower differential on a Slope-138 tee than on a Slope-122 one, because 113 ÷ 138 is smaller than 113 ÷ 122.
The WHS formulas, roundings and caps behind a Handicap Index
Differential = (113 ÷ Slope) × (Score − CR − PCC), rounded to the nearest tenth with .5 up (USGA Rule 5.1a).
With 20 scores, the Index is the average of the lowest 8, rounded to a tenth (Rule 5.2b).
Slope 113 is the rating of a course of standard difficulty.
Maximum Handicap Index: 54.0 (Rule 5.3).
Course Handicap = Index × (Slope ÷ 113) + (CR − Par); Playing Handicap = that, unrounded, × the allowance.
Adjusted gross score caps each hole at net double bogey, or par + 5 before you hold an Index.
Soft cap: any rise beyond 3.0 strokes above the 365-day low counts at 50%.
Hard cap: no more than 5.0 above the 365-day low; no limit on a fall.
An Exceptional Score Reduction follows a differential 7.0 or more better than the Index.
PCC runs from −1.0 to +3.0 and is subtracted, so a hard day lowers every differential.
Frequently asked questions
Your actual score with each hole capped at net double bogey: par + 2 + any handicap strokes you receive on that hole (Rule 3.1). Before you hold an Index, the cap is par + 5. It stops one disaster hole from inflating your handicap. Enter the adjusted figure here; this calculator does not apply the cap, because it does not see your hole-by-hole card.
113 is the Slope Rating of a course of standard difficulty. Multiplying by 113 ÷ Slope scales every round to that reference, so one Index can travel between courses. At the same Course Rating, a 90 on a Slope-130 tee gives a lower differential than a 90 on a Slope-113 tee: the same score on a harder tee counts as the better round.
Because it is built from your best rounds. With 20 scores it averages the lowest 8 differentials and ignores the other 12, so it describes your better days rather than your average round.
The Handicap Index travels with you between courses. The Course Handicap is Index × (Slope ÷ 113) + (Course Rating − Par) for one tee. The Playing Handicap is the unrounded Course Handicap times the allowance for the format, and it is the number of strokes you receive in a competition (Rules 6.1a and 6.2a).
Rule 6.2a keeps the full Course Handicap and rounds only once, after the allowance. The USGA's clarification to that rule says that "Approximately 25% of the time" rounding twice "can produce Playing Handicaps that are significantly different"; its example of two players, Index 8.6 and 10.3 at 85%, gives 9 and 9 when rounded twice and 8 and 10 when rounded once. In limited circumstances, for practical purposes, a committee may apply the allowance to the rounded Course Handicap instead.
Yes, but not in this calculator. Under the 2024 revision the USGA converts a 9-hole score into an 18-hole Score Differential straight away by pairing it with an expected score for the nine holes not played, based on your Handicap Index; the R&A text still allows a 9-hole score to wait until a second one can be combined with it, where applicable, so check which method your association applies. This tool takes 18-hole adjusted gross scores only.
The Playing Conditions Calculation. Your association's system uses the day's scores to judge whether conditions made the course play harder or easier than normal, and sets an adjustment of −1.0, 0.0, +1.0, +2.0 or +3.0 (Rule 5.6), using at least eight acceptable scores from players with an Index of 36.0 or below. The PCC is subtracted in the differential, so on a hard day (wind, rain, fast greens) a positive PCC lowers every player's differential. This calculator takes PCC as 0.
Rule 5.2a substitutes a smaller pool and, for very short records, a downward adjustment: 3 scores use the lowest 1 minus 2.0; 4 scores the lowest 1 minus 1.0; 5 scores the lowest 1; 6 scores the average of the lowest 2 minus 1.0; 7–8 the lowest 2; 9–11 the lowest 3; 12–14 the lowest 4; 15–16 the lowest 5; 17–18 the lowest 6; 19 the lowest 7; and 20 the lowest 8. The result is rounded to the nearest tenth, and an initial Index above 54.0 becomes 54.0. This calculator applies that table to differentials it has already rounded to a tenth, as Rule 5.1a requires.
A negative calculated Index is a plus handicap. R&A Interpretation 5.2c/1 asks players to write it with a "+" sign and says an Index written with a "−" sign should be queried, so this tool shows +1.2, never −1.2. When an allowance applies, USGA Appendix C says a plus Playing Handicap "moves up towards zero including rounding": +1.5 becomes +1 and +0.5 becomes 0.
Your association's system applies the PCC for each day, the soft and hard caps, Exceptional Score Reductions and net double bogey on your hole scores; this tool does not. Your association may also set allowances other than the recommended ones. Use this for estimation; only your association's system issues the official number.
The Rules of Handicapping, 2024 revision, on randa.org (Rule 5, the Index) and usga.org (Rule 6, Course Handicap); the recommended allowances are in Appendix C. In Singapore, the SGA handicap page publishes Course and Slope Ratings by tee.
Method & sources
How it computes
Differential = (113 ÷ Slope) × (adjusted gross − Course Rating), PCC taken as 0, rounded to 0.1 with .5 up (USGA 5.1a). Index: R&A 5.2a table on the most recent 20 (lowest 8 of 20; 3 scores lowest 1 − 2.0), rounded to 0.1, capped at 54.0 (5.3). Course Handicap = Index × Slope ÷ 113 + (CR − par); Playing Handicap = unrounded Course Handicap × allowance (6.1a, 6.2a), each rounded .5 up, so a plus value moves towards zero and prints with "+".
What this tool implements
- R&A/USGA Rules of Handicapping, 2024 revision: USGA Rule 5.1a (each Score Differential rounded to the nearest tenth, .5 up); R&A Rule 5.2a fewer-than-20 table and 5.2b lowest 8 of the most recent 20, result rounded to the nearest tenth; Rule 5.3 maximum 54.0; USGA Rule 6.1a Course Handicap and 6.2a Playing Handicap, the allowance applied to the unrounded Course Handicap.
- Allowances offered are the ones USGA Appendix C lists as recommended (individual stroke play and Stableford 95%, four-ball stroke play and Stableford 85%, individual match play 100%, four-ball match play 90%); the page says the national association sets them or delegates that.
- Plus values: rounded .5 upwards, i.e. towards zero, as USGA Appendix C states for a plus Playing Handicap; printed with "+" per R&A Interpretation 5.2c/1. The tool rounds a plus Course Handicap the same way under Rule 6.1a.
- Rounds are entered oldest first; only the most recent 20 count. A round without a Course Rating or Slope uses 72.0 / 113 and the result names those lines; a typed 0, a negative or a non-number is refused.
- Not applied, and stated on the page: PCC (Rule 5.6, taken as 0), the soft and hard caps (Rule 5.8), exceptional score reductions (Rule 5.9), net double bogey (the user enters adjusted gross scores) and 9-hole scores.
- Corrected 2026-10-14: differentials and the Index were not rounded before use (a synthetic record was off by 0.1 roughly one time in seven to nine), the Index was not capped at 54.0 (twenty rounds of 150 at 67.0/113 showed 83.0), plus Course Handicaps rounded away from zero and printed "-2", "-1" or "-0", and the page gave the PCC direction backwards and four-ball stroke play as 90%.
Sources
- The R&A. Rules of Handicapping — Rule 5, Handicap Index Calculation (5.2a table, 5.3 maximum 54.0, 5.6 PCC, 5.8 caps): https://www.randa.org/roh/the-rules-of-handicapping/rule-5
- USGA. Rules of Handicapping, Rule 5.1a, Calculation of a Score Differential: https://www.usga.org/handicapping/roh/Content/rules/5%201a%20Calc…
- USGA. Rules of Handicapping, Rule 6.1a, Course Handicap (18 holes): https://www.usga.org/handicapping/roh/Content/rules/6%201a%2018%2…
- USGA. Rules of Handicapping, Rule 6.2a, Playing Handicap, with Clarification 6.2a/1: https://www.usga.org/handicapping/roh/Content/rules/6%202a%20Stan…
- USGA. Rules of Handicapping, Appendix C, Handicap Allowances (recommended allowances; plus Playing Handicaps): https://www.usga.org/handicapping/roh/Content/rules/Appendix%20C%…
- USGA. Treatment of 9-hole scores — 2024 revision FAQ: https://www.usga.org/content/usga/home-page/handicapping/world-ha…
- Singapore Golf Association. Handicap — Course & Slope Rating by tee: https://sga.org.sg/golf-development/handicap/
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