How Handicap Index Is Calculated and Why It May Not Change

Summary This article explains the primary factors that affect how your handicap index is calculated and why your index may not change after posting new scores.

How your Handicap Index is calculated

• The handicap index is calculated by averaging your lowest 8 score differentials among your 20 most recently posted rounds.
• The specific 8 score differentials used in the calculation are indicated in your revision history (they are marked).

Key factors that affect the calculation and display of your index

• Composition of the most recent 20 posted rounds
  • Only the 20 most recently posted rounds are considered when determining which score differentials are eligible.
  • As you post more scores, earlier rounds are pushed out of the most recent-20 pool; this can change which differentials are included in the lowest 8 and thus change your index.
• Which differentials are the lowest 8
  • The index uses the average of the lowest 8 differentials within the most recent 20 rounds. If those lowest 8 are not changed by a new posting (either because the new score is not lower or because it does not push out a used differential), the index will remain the same.
• Replacement versus similar differentials
  • If a new posted round replaces an older round but has a similar score differential to the one it replaced, the handicap index may remain effectively unchanged.

How to check what is affecting your index

1. Review your revision history to see which score differentials are marked as the lowest 8 used in your calculation.
2. Confirm how many of those lowest 8 come from the current season versus earlier rounds.
3. Continue posting additional scores — as older rounds are pushed out of your most recent 20, the set of lowest 8 will update and your index will adjust accordingly (unless newly included differentials are similar to those they replace).

Troubleshooting tips

• If your index does not change after posting several new rounds:
  • Check the revision history to verify whether the lowest 8 differentials were affected.
  • Note that if new scores do not change the pool of lowest 8 (or replace them with similar differentials), the index will remain similar.
• If you expect a specific change but do not see it, continue to post scores; once lower or higher differentials enter the lowest-8 set (or older ones are pushed out), the index will reflect those changes.

Conclusion Your handicap index is determined by the average of your lowest 8 score differentials from your 20 most recent posted rounds. Changes to the index depend on whether new posted scores affect that set of lowest 8 (either by introducing lower differentials or by pushing older used differentials out of the most recent 20). Reviewing your revision history will show exactly which differentials are being used.