What is a score differential?

A score differential measures how your adjusted gross score compares to the Course Rating, scaled by Slope Rating. Formula: (Adjusted Gross Score − Course Rating) × 113 ÷ Slope Rating. Most scorecards and club apps display this number after each round.

Why only 8 of 20 rounds?

The WHS formula uses the 8 lowest (best) differentials from your 20 most recent rounds to reflect your demonstrated potential rather than your average performance. This rewards consistency and improvement.

What does the 0.96 factor do?

The 0.96 "bonus for excellence" adjustment is built into the WHS formula. Multiplying by 0.96 slightly lowers the resulting index, meaning players benefit from consistently low scores — the better you play, the more the factor helps.

What if I have fewer than 20 rounds?

If you have fewer than 20 rounds on record, the WHS uses a scaled number of differentials (e.g., best 1 of 3, best 3 of 7, best 6 of 16). This calculator uses the standard best-8 formula and is most accurate once you have 20 or more rounds.

What is a good Handicap Index?

Index values range from +8 (scratch or better) to 54.0 (the WHS maximum). A 10–15 index is a typical recreational player. Under 5 is considered low; over 30 is a higher-handicap player. There is no "good" or "bad" — it simply reflects your current level.

Golf Handicap Index Calculator

Name: Golf Handicap Index Calculator
Availability: InStock
Author: Nham Vu

Enter up to 20 score differentials and get your WHS Handicap Index using the official best-8-of-20 formula with the 0.96 adjustment.

Score Differentials

Enter up to 20 differentials, one per line or comma-separated. Example: 12.3, 15.1, 10.8

Your WHS Handicap Index

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Rounded to 1 decimal place

Formula: Average of lowest 8 differentials × 0.96, rounded to 1 decimal.

Requires at least 3 rounds entered. Fewer than 20 rounds may not reflect your official WHS index exactly.

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