How do you calculate golf handicap differential?

Differential = (Adjusted Gross Score - Course Rating) × 113 ÷ Slope Rating. This page applies that formula and rounds to one decimal place.

Is this my official handicap index?

No. Your official Handicap Index is managed by your golf association and usually averages the best score differentials from your recent rounds.

Free Golf Calculator

Use the WHS differential formula in seconds. Start with one score, then add rounds to spot real progress.

Only score is required. Rating and slope have sensible defaults and quick-fill options.

Adjusted gross score *

Quick-fill course setup (optional)

Course rating

Slope rating

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Handicap differential

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Run the calculator to see your differential.

Score	Rating	Slope	Differential

Differential = (Score − Course Rating) × 113 ÷ Slope Rating