Golf Handicap Calculator

Estimate a golf Handicap Index from recent scores, course rating and slope under the World Handicap System.

Rounds (adjusted gross score, course rating, slope)	88 71.2 128 92 72.4 133 85 70.1 121 90 71.2 128

Rounds (adjusted gross score, course rating, slope)

Up to your most recent 20 rounds, oldest first.

Handicap Index

12.9

Average of the lowest 1 of your 4 score differentials with a -1 adjustment. Course handicap on a slope-113, par-72, CR 72 course: 13.

Score differentials

Round	Differential	Counted
1	14.8
2	16.7
3	13.9	✓
4	16.6

About the Golf Handicap Calculator

Each round gives a score differential = (113 ÷ slope rating) × (adjusted gross score − course rating). The Handicap Index is the average of the best 8 of the last 20 differentials; with fewer rounds, the WHS table uses fewer differentials and small adjustments. The maximum index is 54.0.

The formula

Differential = 113 ÷ slope × (score − course rating); index = average of lowest 8 of 20

Worked example

Example: Handicap Index = 13.1

Input: Rounds (adjusted gross score, course rating, slope): 90 72.0 130; 86 71.5 125; 94 73.1 135; 88 70.8 128; 91 72.0 131.
Formula: Differential = 113 ÷ slope × (score − course rating); index = average of lowest 8 of 20
Result: Handicap Index = 13.1

Things to keep in mind

Doesn't apply net double bogey adjustments, playing conditions (PCC), soft and hard caps or exceptional-score reductions; your official index comes from your national association.

Questions people ask

What's an adjusted gross score?

Your score with each hole capped at net double bogey.

What's a course handicap?

Index × slope ÷ 113 + (course rating − par).

Sources

USGA: World Handicap System