Golf handicap index calculator (WHS)

Write one round per line, oldest first: adjusted gross score, Course Rating and Slope Rating of the tees played.

Result

8.6Estimated Handicap Index

Estimate: only the index from your golf association is official.
Differentials used: 8.7, 10.5; Average of the best 2 of the last 6 differentials.
WHS table adjustment: -1
All score differentials: 11.4, 16.0, 8.7, 15.5, 12.6, 10.5

Your rounds (18 holes): 85 72.1 128 90 71.4 131 82 72.1 128 88 70.8 125 86 71.4 131 84 72.1 128
Playing Conditions Calculation (PCC, optional): 0

Score differential of each round = (113 ÷ Slope) × (adjusted gross score − Course Rating − PCC), rounded to 0.1.

Estimated Handicap Index

8.6

How it is calculated

Score differential of each round = (113 ÷ Slope) × (adjusted gross score − Course Rating − PCC), rounded to 0.1.
Of the last 20 rounds, the best are kept per the WHS table (e.g. 3 rounds: best − 2; 6 rounds: average of best 2 − 1; 20 rounds: average of best 8).
The index is that adjusted average, rounded to 0.1 and capped at 54.

6 rounds give differentials 11.4, 16.0, 8.7, 15.5, 12.6, 10.5. Average of the best 2 (8.7 and 10.5) = 9.6, minus 1.0: estimated index 8.6.

This is an estimate: the official index also uses net double bogey adjustment, 9-hole rounds, soft and hard caps and exceptional score reductions.
The score you type must already be the adjusted gross score.

What is this tool used for?

Write one round per line, oldest first: adjusted gross score, Course Rating and Slope Rating of the tees played.

How is the result calculated?

Score differential of each round = (113 ÷ Slope) × (adjusted gross score − Course Rating − PCC), rounded to 0.1.

What should I check before using the result?

This is an estimate: the official index also uses net double bogey adjustment, 9-hole rounds, soft and hard caps and exceptional score reductions.