How to use the golf handicap calculator
- In the box, enter one 18-hole round per line: your adjusted gross score, the course rating and the slope rating of the tees you played, separated by commas. If a round had a playing conditions calculation (PCC) adjustment, add it as a fourth number.
- Put your most recent round on the last line. You need at least 3 rounds, and the calculator uses the last 20.
- Enter the course rating, slope and par of the tees you're about to play to see your course handicap.
Your adjusted gross score caps each hole at net double bogey: par + 2 + any handicap strokes you get on that hole. The rating and slope are printed on the scorecard and listed in your golf association's course database.
How a Handicap Index is calculated
The course rating is what a scratch golfer is expected to shoot, and the slope rating measures how much harder the course plays for a bogey golfer; 113 is the slope of a course of average difficulty. Each differential is rounded to the nearest tenth. The course handicap is rounded to the nearest whole number and tells you how many strokes you receive from those particular tees. These are the formulas in Rules 5.1, 5.2 and 6.1 of the Rules of Handicapping (2024 edition), published by the USGA and The R&A.
Worked example
The default record has 10 rounds, so the index uses the lowest 3 differentials. The first round, 92 on a course rated 71.8 with a slope of 127, gives:
- (113 ÷ 127) × (92 − 71.8) = 0.8898 × 20.2 = 17.97, rounded to 18.0
Doing the same for all ten rounds gives 18.0, 14.4, 19.5, 18.0, 12.6, 21.2, 17.1, 17.1, 15.3 and 17.8. The lowest three are 12.6, 14.4 and 15.3:
- Average: (12.6 + 14.4 + 15.3) ÷ 3 = 42.3 ÷ 3 = 14.1
On tees rated 71.8 with a slope of 127 and a par of 72, the course handicap is 14.1 × (127 ÷ 113) + (71.8 − 72) = 15.85 − 0.2 = 15.65, which rounds to 16 strokes.
With only the first three rounds, the index is the lowest differential minus 2.0: 14.4 − 2.0 = 12.4.
Fewer than 20 rounds
| Differentials in your record | Lowest used | Adjustment |
|---|---|---|
| 3 | 1 | −2.0 |
| 4 | 1 | −1.0 |
| 5 | 1 | 0 |
| 6 | 2 (average) | −1.0 |
| 7 or 8 | 2 | 0 |
| 9 to 11 | 3 | 0 |
| 12 to 14 | 4 | 0 |
| 15 or 16 | 5 | 0 |
| 17 or 18 | 6 | 0 |
| 19 | 7 | 0 |
| 20 | 8 | 0 |
The adjustments for 3, 4 and 6 rounds make a new golfer's index slightly lower while the record is short, since a few rounds aren't enough to show their potential.
What this calculator leaves out
Your official index, calculated daily by your golf association, also applies a soft cap and hard cap that limit how fast your index can rise above your lowest index of the past 12 months, and an exceptional score reduction after a round 7 or more strokes better than your index. Since 2024, 9-hole rounds and rounds of 10 to 17 holes are converted to 18-hole differentials using your expected score, which needs your index at the time. This calculator handles complete 18-hole rounds only, so treat the result as an estimate.
Frequently asked questions
What's the difference between a Handicap Index and a course handicap?
A Handicap Index measures your ability on a course of average difficulty and travels with you. A course handicap converts it into strokes for one set of tees, using that course's slope, rating and par. The same 14.1 index might give 13 strokes on an easy course and 18 on a hard one.
How many rounds do I need for a handicap?
At least 54 holes, which is three 18-hole rounds (or a mix of 9- and 18-hole rounds in the official system). With fewer than 20 rounds, the index uses fewer differentials, with an extra reduction when you have 3, 4 or 6, as shown in the table.
What is PCC in golf?
The playing conditions calculation is an adjustment from −1 to +3 that your golf association applies on days when scores were unusually high or low, for example in strong wind. Most days it's 0. You'll find it next to the posted score in your scoring record.
Is a lower Handicap Index better?
Yes. A lower index means you're closer to a scratch golfer. A plus handicap, shown as +1.2 for example, is better than scratch: that golfer gives strokes back to the course.
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