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Golf Handicapping

WHS Score Differential Calculator

Calculate your Score Differential for a single round of golf under the World Handicap System. Normalizes your gross score against the relative difficulty of the tees played.

Standard: WHS Rule 5.1a (USGA / R&A 2024 Edition) • Checked 23 Aug 2026

Round & Score Details

Sample Rounds:
Net Double Bogey Check: AGS is your gross score with maximum score per hole capped at Par + 2 + Handicap strokes received on that hole.
Single Round Output WHS Rule 5.1a
Score Differential
12.0
Rounded to 1 decimal place
Exact Unrounded
12.006
Gross vs Rating
+13.6
Slope Factor (113/Slope)
0.883
PCC Offset
0.0
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How a Score Differential is calculated

A Score Differential measures how well you played in relation to the difficulty of the golf course tees, based on Course Rating and Slope Rating under WHS Rule 5.1a.

Score Differential = (113 / Slope Rating) × (Adjusted Gross Score − Course Rating − PCC) (Rounded to nearest tenth)
Adjusted Gross Score (AGS)
Your total score after applying Net Double Bogey maximums on any blow-up holes.
Course Rating (CR)
The evaluation of difficulty for a scratch golfer under normal course and weather conditions.
Slope Rating
The evaluation of difficulty for a bogey golfer relative to scratch (113 represents standard baseline difficulty).
PCC
Playing Conditions Calculation adjustment (−1.0 to +3.0) applied if weather or setup made scoring significantly harder or easier on that day.

Accuracy notes and governing-body limits

Playing Conditions Calculation (PCC)

PCC is automatically computed each evening by your national golf association's central scoring server whenever at least 8 eligible scores are submitted on that course. You should set PCC = 0.0 unless your club or scorecard provides the official day adjustment.

Worked example: USGA Rule 5.1a verification

A player shoots an Adjusted Gross Score of 85 on a tee with Course Rating 71.4 and Slope Rating 128, on a day with normal conditions (PCC = 0.0):

  1. Subtract Course Rating & PCC from Gross Score: 85 − 71.4 − 0.0 = 13.6
  2. Calculate Slope Ratio: 113 / 128 = 0.8828125
  3. Multiply: 0.8828125 × 13.6 = 12.00625
  4. Round to the nearest tenth: 12.0 Score Differential

How Slope Rating influences your differential on an 85

This table demonstrates how shooting the exact same gross score (85 on a 72.0 CR tee) produces different differentials depending on course difficulty:

Course Difficulty Slope Rating Gross Score Course Rating Calculated Differential
Extreme Challenge 145 85 72.0 10.1
Tough Course 135 85 72.0 10.9
Above Average 125 85 72.0 11.8
Standard Baseline 113 85 72.0 13.0
Gentle / Flat 100 85 72.0 14.7

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Handicap Index Calculator

Combine your lowest 8 score differentials into an official estimated WHS Handicap Index.

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Course Handicap Calculator

Determine your Playing Handicap and strokes received before you tee off.

Frequently asked questions

Can a Score Differential be negative?

Yes. If you shoot lower than the Course Rating (for instance, a 69 on a tee with Course Rating 71.5), your differential will be negative (indicated with a plus symbol +2.0 in traditional golf notation), representing a plus-handicap round.

How do 9-hole rounds get converted into score differentials?

Under the 2024 WHS update, 9-hole score differentials are immediately combined with an expected 9-hole differential based on your current Handicap Index to produce an 18-hole equivalent differential for same-day handicap posting.