1. What is the Handicap Index?

The Handicap Index is a measure of a player's demonstrated ability calculated against the Slope Rating of a golf course of standard playing difficulty. It is the cornerstone of the World Handicap System (WHS) implemented in 2020.

2. How Does the Calculator Work?

The calculator uses the WHS Handicap Index formula:

Where:

• \( HI \) — Handicap Index (unitless)
• \( SD \) — Score Differential (unitless)
• \( 8 \) — Number of best score differentials used
• \( 0.96 \) — Bonus for Excellence multiplier

Explanation: The formula takes the average of your best 8 score differentials from your most recent 20 rounds and applies a 96% multiplier to create your Handicap Index.

3. World Handicap System (WHS) Rules

Score Differentials Required:

• 3 scores: Use best 1 differential
• 4-5 scores: Use best 1 differential
• 6-8 scores: Use best 2 differentials
• 9-10 scores: Use best 3 differentials
• 11-12 scores: Use best 4 differentials
• 13-14 scores: Use best 5 differentials
• 15-16 scores: Use best 6 differentials
• 17 scores: Use best 7 differentials
• 18+ scores: Use best 8 differentials

4. Using the Calculator

Tips: Enter your score differentials (one per line). You need at least 3 score differentials to calculate a Handicap Index. The calculator automatically selects the appropriate number of best scores based on WHS rules.

5. Frequently Asked Questions (FAQ)

Q1: What is a Score Differential?
A: A Score Differential is the difference between your adjusted gross score and the course rating, adjusted for slope rating and playing conditions.

Q2: Why is there a 0.96 multiplier?
A: The "Bonus for Excellence" multiplier (0.96) ensures that a player's handicap index reflects their potential ability rather than their average performance.

Q3: How often should I update my handicap?
A: Under WHS, handicaps are updated daily when new scores are posted, providing a current reflection of your ability.

Q4: What's the maximum handicap index?
A: The maximum Handicap Index is 54.0 for both men and women under the WHS.

Q5: How does this differ from the old system?
A: WHS provides a more consistent and portable handicap worldwide, with daily updates and a unified calculation method across golf associations.