Calculate your Handicap Index from up to 20 rounds, then your Course Handicap and Playing Handicap for any course — using the current World Handicap System formula.
Enter your recent round scores and course/slope ratings. The WHS uses the best 8 of your last 20 rounds.
PCC is the Playing Conditions Calculation from your official scoring record. Most rounds have a PCC of 0 — only change it if your handicap provider's record shows a different value for that round.
Since 2024, authorised WHS services convert a 9-hole score into an 18-hole Score Differential using an expected-score calculation. If you're posting a 9-hole round, enter the final differential shown in your official record using Enter existing Score Differentials below — this calculator does not independently reproduce that expected-score process, and does not double a 9-hole score.
6 of 20 rounds| # | Gross Score | Course Rating | Slope Rating | PCC | Differential | Remove round |
|---|
Course Handicap (for a specific course)
Accepts −10.0 to 54.0. Enter −2.0 for a plus-2 golfer — golf convention writes that as "+2", but the Course Handicap formula below needs the signed number.
| Stat | Value |
|---|
Australia adopted the World Handicap System (WHS) in 2020. The Handicap Index is calculated using the best 8 differentials from the most recent 20 rounds.
Differential = (113/Slope) × (Adjusted Gross Score − Course Rating − PCC Adjustment)
Handicap Index = Average of best 8 differentials, rounded to the nearest tenth
Written and reviewed by Mohsin Iqbal · Last reviewed August 2026 · Formula verified directly against USGA and R&A Rules of Handicapping
A number that estimates the score you're capable of on a good day, not your average score. A 15 handicap doesn't shoot 87 every round — they mostly shoot 90 to 95, with the occasional round near 85. The handicap represents demonstrated potential, which is what lets a scratch golfer and a 20-handicapper play a genuinely competitive match.
Since 2020, one system covers the whole world: the World Handicap System (WHS), developed jointly by the USGA and The R&A and adopted by Golf Australia, Golf Canada, England Golf and the other national bodies. Before WHS, a handicap earned in the US didn't translate cleanly to Australia or the UK. Now it does.
| Term | What it is |
|---|---|
| Handicap Index | Your portable number, calculated from your recent scores. Follows you to any course. |
| Course Handicap | Your Handicap Index adjusted for the specific course and tees you're about to play. |
| Playing Handicap | Your Course Handicap adjusted for the format of the competition — stroke play, four-ball, and so on. |
Each one feeds the next. The Handicap Index is calculated once from your scoring history; the Course Handicap and Playing Handicap are calculated fresh every time you tee off somewhere new.
Every round you post becomes a Score Differential — a single number that says how you played relative to the course's difficulty, stripped of which course it was.
Score Differential = (Adjusted Gross Score − Course Rating − PCC) × 113 ÷ Slope Rating
PCC is the Playing Conditions Calculation — a small adjustment your handicap provider applies when conditions made an entire field of scores unusually hard or easy on a given day. It ranges from −1 to +3, and appears automatically in your official record. The great majority of rounds have a PCC of 0.
The 113 is not arbitrary. It's the Slope Rating of a course of "standard" difficulty, so dividing by your actual course's slope and multiplying by 113 puts every round on the same scale, regardless of which course produced it. A tough course with a high slope shrinks your differential for a given score; an easy course inflates it.
| You shot | Course Rating | Slope Rating | PCC | Differential |
|---|---|---|---|---|
| 85 | 72.0 | 125 | 0 | (85−72.0−0)×113÷125 = 11.8 |
| 85 | 72.0 | 113 | 0 | (85−72.0−0)×113÷113 = 13.0 |
| 85 | 72.0 | 100 | 0 | (85−72.0−0)×113÷100 = 14.7 |
| 85 | 72.0 | 125 | +1 | (85−72.0−1)×113÷125 = 10.8 |
Same score, three different differentials. The harder course (slope 125) produces the lowest differential, because shooting 85 there says more about your game than shooting 85 on an easier one.
Your Handicap Index is the average of your best score differentials from your last 20 rounds. That's the whole idea. The two details that trip people up are how many differentials count, and what happens with fewer than 20 rounds on record.
With a full 20 rounds on record, it's the average of your best 8. With fewer than 20, WHS uses a published table (USGA Rule 5.2a) to decide how many count and applies a small safety adjustment for very new golfers, so a handicap calculated from just three rounds isn't unrealistically low.
| Rounds on record | Differentials used | Adjustment |
|---|---|---|
| 3 | Lowest 1 | −2.0 |
| 4 | Lowest 1 | −1.0 |
| 5 | Lowest 1 | none |
| 6 | Lowest 2 | −1.0 |
| 7–8 | Lowest 2 | none |
| 9–11 | Lowest 3 | none |
| 12–14 | Lowest 4 | none |
| 15–16 | Lowest 5 | none |
| 17–18 | Lowest 6 | none |
| 19 | Lowest 7 | none |
| 20 | Lowest 8 | none |
The result is rounded to the nearest tenth. A calculated index above the WHS maximum of 54.0 is capped there.
This is the exact example the USGA publishes to illustrate the safety adjustment. A golfer has six rounds on record, with score differentials of 2.6, 4.4, and four higher scores well above those two.
| Step | Working | Result |
|---|---|---|
| Rounds on record | 6 | Table says: lowest 2, adjustment −1.0 |
| Lowest 2 differentials | 2.6 and 4.4 | average 3.5 |
| Apply the adjustment | 3.5 − 1.0 | 2.5 |
| Round to the nearest tenth | — | Handicap Index 2.5 |
Without the −1.0 adjustment, six rounds would average out to 3.5 — overstating how consistently this golfer plays to that level on only six rounds of evidence. The adjustment exists specifically to stop a small sample from looking more certain than it is.
Your Handicap Index is portable, but courses differ, so it needs converting before you play a specific one.
Course Handicap = Handicap Index × (Slope Rating ÷ 113) + (Course Rating − Par)
| Handicap Index | Slope | Course Rating | Par | Course Handicap |
|---|---|---|---|---|
| 8.4 | 135 | 71.2 | 72 | 8.4×(135/113)+(71.2−72) = 9 |
| 18.0 | 113 | 72.0 | 72 | 18.0×(113/113)+(72.0−72) = 18 |
| 5.0 | 145 | 74.5 | 72 | 5.0×(145/113)+(74.5−72) = 9 |
Notice the second row: at exactly slope 113 with course rating equal to par, the Course Handicap equals the Handicap Index unchanged. That's what 113 as the "standard" slope means in practice.
The final step, and the one most calculators skip. Some formats award full strokes; others only a percentage.
Playing Handicap = Course Handicap × Allowance %
| Format | Typical allowance |
|---|---|
| Individual stroke play | 100% |
| Four-ball (better ball) stroke play | 90% per player, commonly |
| Foursomes | 50% combined, varies by competition |
| Match play | 100%, often net of the difference between players |
The allowance is set by whoever is running the competition, not by WHS itself — check the terms of competition on the day, since 90% is common but not universal.
Scores must be from an actual rated course with a published Course Rating and Slope Rating. Indoor simulator rounds generally don't count, since simulators lack the official ratings the formula depends on.
| Body | Covers | Role |
|---|---|---|
| Golf Australia | Australia | Administers WHS nationally; the GA Handicap app tracks your index |
| USGA | United States, Mexico | Co-developed WHS; GHIN is the platform most US clubs use |
| The R&A | UK, Ireland, and rules globally outside the US/Mexico | Co-developed WHS with the USGA; sets the Rules of Golf worldwide |
| Golf Canada | Canada | National administrator, same WHS formula |
| New Zealand Golf | New Zealand | National administrator, same WHS formula |
All five use the identical formula described on this page. The only country-to-country differences are administrative — which app or platform tracks your scores, not how the maths works.
| Handicap Index | Category | Typical score on a par-72 |
|---|---|---|
| Plus (below 0) | Elite / scratch-plus | Under par |
| 0–5 | Low handicap | 72–77 |
| 6–12 | Single-figure to low mid | 78–84 |
| 13–18 | Mid handicap | 85–90 |
| 19–28 | High mid | 91–100 |
| 29–54 | Beginner range | 100+ |
The global average handicap sits in the mid-teens. A handicap under 10 is genuinely good; scratch (0) or better is a small fraction of golfers.
| Term | Meaning |
|---|---|
| Adjusted Gross Score | Your actual score, capped per hole by net double bogey |
| Course Rating | The score a scratch golfer would be expected to shoot on this course |
| Slope Rating | How much harder the course plays for a bogey golfer than a scratch golfer, on a scale centred at 113 |
| Score Differential | A single round converted to a course-neutral number |
| Net Double Bogey | The maximum score counted on any hole for handicap purposes |
| Low Handicap Index | Your lowest index in the trailing 365 days, used by the soft and hard caps |
| PCC | Playing Conditions Calculation — a small adjustment for an unusually hard or easy day across a whole field |
Convert each round to a Score Differential — (score minus Course Rating) times 113 divided by Slope Rating — then average your best differentials from your last 20 rounds. With fewer than 20 rounds, WHS Rule 5.2a sets how many count and applies a small safety adjustment. The result is rounded to the nearest tenth.
Score Differential = (Adjusted Gross Score − Course Rating) × 113 ÷ Slope Rating. Your Handicap Index is the average of your best differentials from your recent rounds. There is no multiplier in the current formula — the old 0.96 "bonus for excellence" factor was removed when the World Handicap System launched in 2020.
No. It was part of the pre-2020 USGA Handicap System and was specifically removed when WHS replaced it, according to official change documentation from the USGA and regional golf associations. Any explainer still describing a 0.96 step is describing the retired system, not current WHS.
A minimum of three 18-hole rounds, or the equivalent 54 holes combining 9-hole rounds. Your index becomes fully established once you have 20 rounds on record, at which point the standard best-8-of-20 calculation applies.
Handicap Index is your portable number, calculated from your scoring history and unrelated to any specific course. Course Handicap converts that index for the exact course and tees you're about to play, using the course's Slope Rating, Course Rating and par.
Your Course Handicap adjusted for the format of the competition. Individual stroke play typically uses 100% of your Course Handicap; four-ball events commonly use around 90% per player. The exact allowance is set by the competition's terms, not by WHS itself.
(Adjusted Gross Score − Course Rating) × 113 ÷ Slope Rating. The 113 represents the Slope Rating of a course of standard difficulty, which puts rounds played on different courses onto a single comparable scale.
Because a handicap is meant to represent your potential, not your average. Averaging only your best rounds captures what you're capable of on a good day, which is the number that makes matches fair between players of different ability.
Yes. Golf Australia, the USGA, The R&A, Golf Canada and New Zealand Golf all use the identical World Handicap System formula. The only differences are administrative — which app or platform each body uses to track scores.
The maximum score counted on any single hole for handicap purposes: par plus two, plus any handicap strokes you receive on that hole. It stops one disastrous hole from distorting an otherwise representative round.
The global average sits in the mid-teens, so a handicap under 10 is genuinely good and under 5 is very good. Scratch, a handicap of 0, or better represents a small fraction of golfers.
In most countries you need to be affiliated with your national body, usually through a golf club or an approved app-based provider. Golf Australia, the USGA and England Golf all offer pathways that don't require traditional full club membership.
A round producing a differential 7.0 strokes or more better than your current index triggers a safeguard: a −1 or −2 adjustment applied across your recent scoring record, which prevents one outstanding round from distorting your index in the way a single bad round doesn't.