Golf Handicap Calculator
Enter up to 20 rounds — each with its adjusted gross score, course rating, and slope — and this calculator returns your Handicap Index under the USGA World Handicap System. It averages the best 8 of your most recent 20 score differentials, applying the official fewer-rounds table when you have entered less than 20.
| Round | Score | Course rating | Slope | PCC |
|---|
Enter your adjusted gross score, plus the course rating and slope from the tees you played. Leave PCC blank for 0. At least 3 rounds are needed.
How a golf handicap works
A Handicap Index is a portable measure of your demonstrated potential, letting players of different abilities compete fairly. Each round is converted into a score differential that strips out how hard the course was, using its rating and slope. The system then keeps a running record of your recent differentials and averages your best ones — good rounds count, off days are discarded — so the index reflects the level you play to on a strong day rather than your average.
How it’s calculated
For each round, Score Differential = (113 ÷ slope) × (adjusted gross score − course rating − PCC). The Handicap Index is the average of a set number of your lowest differentials from the most recent 20 rounds, rounded to one decimal and capped at 54.0. With a full 20 scores that is the best 8. With fewer, the USGA table applies: 3 scores use the lowest 1 minus 2.0; 4 use lowest 1 minus 1.0; 5 use lowest 1; 6 average 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.
Follows the USGA/R&A World Handicap System (2024 Rules of Handicapping, Rule 5.2). Enter adjusted gross scores; net double bogey caps and the soft/hard cap on index rises are not applied here.
Fewer-rounds table
| Scores | 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 |
Source: USGA/R&A World Handicap System, Rule 5.2a (2024).
Worked example
A golfer posts three rounds: 95 on a course rated 72.0 / slope 130, 90 on 71.5 / 125, and 88 on 70.0 / 118. The differentials are (113/130)(95−72.0) = 20.0, (113/125)(90−71.5) = 16.7, and (113/118)(88−70.0) = 17.2. With three scores the index uses the lowest differential (16.7) minus 2.0, giving a Handicap Index of 14.7.
Common mistakes
- Entering your raw score instead of the adjusted gross (net double bogey max per hole).
- Swapping course rating and slope — rating is near par (67–77), slope is 55–155.
- Expecting your handicap to equal your average score to par; it reflects your better rounds.
- Assuming the old best-10 × 0.96 formula still applies; WHS uses the best 8 of 20.
Where it is used
- Establishing or checking your Handicap Index between official updates.
- Estimating your course handicap before a round or tournament.
- Tracking improvement as new scores replace old ones.
- Setting fair strokes for casual matches among friends.
Frequently asked questions
How is a golf Handicap Index calculated?
Each round gives a Score Differential = (113 ÷ slope) × (adjusted gross score − course rating − PCC). Under the World Handicap System, your Handicap Index is the average of the lowest 8 of your most recent 20 differentials, rounded to one decimal. With fewer than 20 scores, a table sets how many differentials to use and any adjustment.
What are course rating and slope?
Course rating is the score a scratch golfer is expected to shoot on a set of tees, usually between about 67 and 77. Slope rates the relative difficulty for a bogey golfer versus a scratch golfer, from 55 to 155, with 113 being average. Both appear on the scorecard and are needed for each round.
How many rounds do I need for a handicap?
You need at least three 18-hole scores (54 holes) to establish a Handicap Index. With 3 scores the index uses your lowest differential minus 2.0; the formula uses progressively more of your rounds until, at 20 scores, it averages the best 8.
What happened to the old 0.96 multiplier?
The pre-2020 USGA system averaged the best 10 of 20 differentials and multiplied by 0.96 as a ‘bonus for excellence.’ The World Handicap System replaced that with averaging the best 8 of 20 directly, so the 0.96 factor is no longer applied. This calculator follows the current WHS method.
What is the playing conditions adjustment (PCC)?
The PCC is a daily adjustment, from −1 to +3, that accounts for how weather and course setup affected scoring that day. It is normally computed automatically by the handicap system; here you can enter it per round if known, and it defaults to 0.