A golf handicap lets a 25-handicapper and a scratch player compete on equal terms, and since 2020 one system does it worldwide: the World Handicap System (WHS), written and maintained by The R&A and the USGA and run locally by national associations such as England Golf, Scottish Golf and Golf Ireland (through CONGU in GB&I) or the USGA’s GHIN service in the United States. The first revision of the Rules of Handicapping took effect on 1 January 2024 (1 April 2024 in Great Britain and Ireland), and it is still the current edition in 2026; no further revision has been announced at the time of writing. This guide explains each number on your handicap record, from the score differential to the playing handicap you take onto the first tee, and walks through a full example. You can check every step with our golf handicap calculator.
The four numbers you need to know
| Number | What it is | Typical range |
|---|---|---|
| Handicap Index | Your portable ability measure | +5.0 to 54.0 |
| Course Rating | Expected score of a scratch golfer on those tees | about 67–77 for 18 holes |
| Slope Rating | How much harder the course plays for a bogey golfer, relative to a scratch golfer | 55–155, standard 113 |
| Par | The nominal score for the course | 70–72 usually |
Course Rating and Slope Rating are printed on the scorecard and listed in your national association’s course database. A Slope Rating of 113 means the course is of “standard” relative difficulty; higher numbers mean bogey golfers lose more strokes there.
Step 1: Adjusted Gross Score and net double bogey
Before a round counts, bad holes are capped. Under WHS the maximum hole score for handicap purposes is net double bogey:
Net double bogey = par + 2 + handicap strokes received on that hole
Strokes are allocated by the stroke index (hole handicap) on the scorecard. With a Course Handicap of 15 you receive one stroke on holes with stroke index 1–15. So on a par 4 with stroke index 7 your maximum is 4 + 2 + 1 = 7, and on a par 4 with stroke index 16 it is 4 + 2 + 0 = 6. Your gross score after these caps is the Adjusted Gross Score (AGS). Since 2024, holes you did not play are filled in with your expected score rather than net par.
Step 2: Score Differential
Each acceptable round becomes a Score Differential:
Score Differential = (113 ÷ Slope Rating) × (AGS − Course Rating − PCC)
PCC is the Playing Conditions Calculation, an automatic daily adjustment from −1 to +3 if scores on that day were unusually high or low (wind, rain, temporary greens). Most days it is 0. The result is rounded to the nearest tenth.
Example: you shoot 92 gross on tees rated 71.4 / 125, par 72. One hole (a par 4, stroke index 3) was a 9; with a Course Handicap of 15 your cap there is 7, so AGS = 92 − 2 = 90. PCC is 0.
- 90 − 71.4 − 0 = 18.6
- 113 ÷ 125 = 0.904
- 18.6 × 0.904 = 16.81 → 16.8
Nine-hole rounds also count: since the 2024 revision the system adds an expected score for the unplayed nine and produces an 18-hole differential straight away, and rounds of 10–17 holes can be posted as well.
Step 3: Handicap Index, best 8 of 20
Your Handicap Index is the average of the lowest 8 of your most recent 20 Score Differentials, rounded to one decimal. Say your best eight are:
12.4, 13.1, 13.8, 14.0, 14.2, 14.9, 15.3, 15.7
Sum = 113.4; 113.4 ÷ 8 = 14.175 → Handicap Index 14.2. The 16.8 from step 2 is not among the best eight, so it does not change the index today, but it pushes out the oldest score in the window.
With fewer than 20 scores a reduced table applies (Rule 5.2a):
| Differentials | Used | Adjustment |
|---|---|---|
| 3 | lowest 1 | −2.0 |
| 4 | lowest 1 | −1.0 |
| 5 | lowest 1 | 0 |
| 6 | average of lowest 2 | −1.0 |
| 7–8 | average of lowest 2 | 0 |
| 9–11 | average of lowest 3 | 0 |
| 12–14 | average of lowest 4 | 0 |
| 15–16 | average of lowest 5 | 0 |
| 17–18 | average of lowest 6 | 0 |
| 19 | average of lowest 7 | 0 |
| 20 | average of lowest 8 | 0 |
Other safeguards: the maximum Handicap Index is 54.0. A soft cap halves any rise of more than 3.0 above your lowest index of the past 365 days, and a hard cap stops the rise at 5.0. An exceptional score at least 7.0 better than your index cuts your index by 1.0, and 10.0 or more better by 2.0.
Step 4: Course Handicap
The Handicap Index is course-neutral. To find how many strokes you get on a given set of tees:
Course Handicap = Handicap Index × (Slope Rating ÷ 113) + (Course Rating − Par)
With index 14.2 on the 71.4 / 125, par 72 tees:
- 14.2 × 125 ÷ 113 = 15.71
- Course Rating − Par = 71.4 − 72 = −0.6
- 15.71 − 0.6 = 15.11 → Course Handicap 15
On a tougher course rated 74.1 / 138, par 72: 14.2 × 138 ÷ 113 = 17.34, plus 2.1 = 19.44 → 19. Same golfer, four extra strokes, because the course is harder for players of that standard.
Step 5: Playing Handicap and allowances
The Playing Handicap is the Course Handicap multiplied by the handicap allowance for the format, then rounded. The R&A/USGA recommended allowances (Appendix C) include:
| Format | Allowance |
|---|---|
| Individual stroke play (medal, Stableford, par/bogey) | 95% |
| Four-ball stroke play | 85% |
| Singles match play | 100% |
| Four-ball match play | 90% |
For our player in a medal round: 15.11 × 0.95 = 14.35 → Playing Handicap 14 (using the rounded Course Handicap, 15 × 0.95 = 14.25, also gives 14; GB&I clubs work from the unrounded figure, US clubs typically from the rounded one). If the player shoots 88 gross, the net score is 88 − 14 = 74. Committees can set different allowances for their own competitions, so read the terms of the competition.
High handicaps, beginners and practical tips
Beginners can get an index once they have returned scores totalling 54 holes. Because the maximum is 54.0, a Course Handicap can still go higher on a hard course: index 54.0 at 125 slope, par 72, CR 71.4 gives 54 × 125 ÷ 113 − 0.6 = 59.13 → 59 strokes, which means three strokes on every hole plus a fourth on stroke index 1–5.
Tips:
- Post every acceptable round, including bad ones; the system needs a fair picture.
- Use the course’s published Course and Slope Ratings for the tees you played; women’s and men’s ratings differ on the same tees.
- US readers: your index lives in GHIN; UK readers: in the England Golf, Scottish Golf, Wales Golf or Golf Ireland app.
Sources
The formulas and limits above follow the Rules of Handicapping published by The R&A and the USGA (2024 edition, in force in 2026), including Rule 5.2a (fewer than 20 scores), Rule 6.1 (Course Handicap) and Appendix C (handicap allowances). Your national association may apply local procedures, for example for 9-hole competitions. To run your own numbers, open the golf handicap calculator, enter your differentials or rounds, and compare the result with your official record.