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Per-Outing Handicap Adjustment Calculator

An organiser's overlay on one player's index for one outing: a percentage or a points offset. See the adjusted index, clamped between +10 and 54, and the Course Handicap that follows.

From +10 to 54. Type a plus handicap with a plus sign, e.g. +2.4.

A percentage from 1 to 200, or points from −20 to +20.

Or

Adjusted indexExample

12.8

15Course Handicap

A 90% adjustment turns a handicap index of 14.2 into 12.8, which from a tee with a slope of 132, a course rating of 72.2 and a par of 72 is a course handicap of 15.

Handicap Index:
14.2
Adjustment:
Percentage
Amount:
90
Slope Rating:
132
Course Rating:
72.2
Par:
72
How it was calculated
  1. 14.2 × 90% = 12.78, to one decimal 12.8
  2. within +10.0 to 54.0, no clamp
  3. 12.8 × (132 ÷ 113) = 14.952
  4. 14.952 + (72.2 − 72) = 15.152
  5. rounds to 15

Rule: handicap adjustment

Worked example

A 90% adjustment turns a handicap index of 14.2 into 12.8, which from a tee with a slope of 132, a course rating of 72.2 and a par of 72 is a course handicap of 15.

  1. 14.2 × 90% = 12.78, to one decimal 12.8
  2. within +10.0 to 54.0, no clamp
  3. 12.8 × (132 ÷ 113) = 14.952
  4. 14.952 + (72.2 − 72) = 15.152
  5. rounds to 15

How it is calculated

The adjustment is applied to the raw Handicap Index, multiplied by a percentage or offset by points, then rounded to one decimal and held between +10.0 and 54.0. Only then is the Course Handicap worked out for the tee, and only after that does any format allowance apply. The player's source index is never changed. This is the order Parful uses on every outing with an adjustment.

When it does not apply

  • Applied before the Course Handicap and before the allowance. The adjusted index is what the tee converts.
  • A player with no handicap cannot be adjusted. NH stays NH.
  • The adjustment lives on one outing. It never touches the roster index.

Questions

When would an organiser use this?

A guest whose index is out of date, a player returning from injury, or a society rule that plays everyone at 90% for a particular trophy.

Percentage or points?

Percentage scales with the handicap: 90% takes more from a 30 than from a 10. Points move everyone by the same amount.

The rule

This calculator applies the rule explained at www.parful.io/handicaps/handicap-adjustment.

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Trademarks

. GHIN® and USGA® are registered marks of the United States Golf Association. World Handicap System™, WHS™, Handicap Index®, Score Differential™, Low Handicap Index™, Course Handicap™, Playing Handicap™, Course Rating™, Bogey Rating™ and Slope Rating™ are trademarks and service marks owned or licensed by the United States Golf Association and The R&A. Ryder Cup® is a trademark of PGA of America and Ryder Cup Europe. Pinehurst® is a trademark of Pinehurst, LLC. Parful is not affiliated with, sponsored by or endorsed by any of these organizations. Game names such as Stableford, Nassau, Wolf, Vegas and Skins are used descriptively.