Guides · Updated 12 October 2026

How your handicap index is worked out

Your Handicap Index is not an average of your scores. It is built from your best recent rounds, adjusted for how hard each course was. Here is the whole calculation.

1. Adjusted gross score

Every hole score you submit is capped before anything else happens. The cap is net double bogey: the par of the hole, plus 2, plus any handicap strokes you receive on that hole.

Example: on a par 4 where you receive 1 stroke, the most you can count is 4 + 2 + 1 = 7. On a par 5 where you receive 2 strokes, it is 5 + 2 + 2 = 9. The total of your capped hole scores is your adjusted gross score.

A golfer who does not yet have a Handicap Index uses par + 5 as the cap on each hole.

2. Score differential

The adjusted gross score is then turned into a score differential, which measures the round against the difficulty of the course you played:

The Course Rating and Slope Rating come from the tee you played. The PCC (Playing Conditions Calculation) adjustment reflects unusually hard or easy conditions on the day. It is usually 0. The result is shown to one decimal place.

Worked example: you shoot an adjusted gross score of 95 from a tee with a Course Rating of 71.2 and a Slope Rating of 126, with a PCC adjustment of 0.

• 95 − 71.2 − 0 = 23.8
• 113 ÷ 126 = 0.8968
• 23.8 × 0.8968 = 21.34, so the score differential is 21.3

3. The best 8 of your last 20

Once you have 20 score differentials, your Handicap Index is the average of the lowest 8 of your most recent 20, rounded to one decimal place. Older rounds drop out as new ones arrive, and a bad round only counts if it is among your best 8.

Worked example, using these 20 differentials:

24.1, 22.8, 26.0, 21.3, 25.4, 23.0, 27.2, 22.1, 24.9, 20.8, 26.5, 23.7, 25.0, 22.4, 24.3, 21.9, 26.8, 23.3, 25.7, 22.6

The lowest 8 are 20.8, 21.3, 21.9, 22.1, 22.4, 22.6, 22.8 and 23.0. They add up to 176.9, and 176.9 ÷ 8 = 22.11, so the Handicap Index is 22.1.

4. Fewer than 20 scores

You can get a Handicap Index with as few as three scores. With fewer than 20, fewer differentials are used, and for the smallest records a small adjustment is applied. From the official table:

Scores in your record	Differentials used	Adjustment
3	Lowest 1	−2.0
6	Average of the lowest 2	−1.0
9 to 11	Average of the lowest 3	None
20	Average of the lowest 8	None

The full table has a row for every count from 3 to 20. Your club or national association can show it, and it is in the Rules of Handicapping.

5. Soft cap and hard cap

The system limits how fast an index can rise. It compares your newly calculated figure with your Low Handicap Index, the lowest Handicap Index you held in the previous 365 days.

• Soft cap. If the new figure is more than 3.0 above your Low Handicap Index, the part above 3.0 only counts at 50%.
• Hard cap. After the soft cap, the index cannot be more than 5.0 above your Low Handicap Index.

There is no limit on how fast an index can fall.

Worked example: your Low Handicap Index is 18.0 and the calculation gives 22.0. That is 4.0 above, so the first 3.0 counts in full and the remaining 1.0 counts as 0.5. Your index becomes 21.5. If the calculation had given 26.0, the soft cap would give 23.5, and the hard cap would then hold it at 23.0.

Other adjustments

The Rules of Handicapping also cover exceptional scoring reductions, committee reviews and 9-hole scores. This guide covers the core calculation only. For anything unusual, ask your club handicap committee or your national association (for example England Golf or Golf Ireland).

Sources

• Rule 3, Acceptable scores and holes (R&A, Rules of Handicapping)
• Rule 5, Calculating a Handicap Index (R&A, Rules of Handicapping)
• Rule 5.2a, For fewer than 20 scores (USGA, Rules of Handicapping)
• What is a Score Differential? (USGA, World Handicap System FAQ)

Rules summarised from the 2024 edition of the Rules of Handicapping. Your national association and club handicap committee have the final word.