Free golf tool

USGA Handicap Calculator

Estimate your Handicap Index from recent 18-hole scores. Enter adjusted gross score, Course Rating, Slope Rating, and the Playing Conditions Calculation for each round.

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Recent scores

Diff.

10.8

Diff.

13.7

Diff.

10.1

Diff.

15.5

Diff.

13.1

Only complete, valid 18-hole scores count. If you enter 20 scores, use your most recent rounds.

Handicap estimate

Estimated Index

10.1

Valid scores

Scores used

Lowest 1

Average diff.

10.1

Adjustment

0.0

Counting differentials

10.1

Calculation notes

This estimates a Handicap Index using the WHS score differential formula and the lowest-differentials table. Official GHIN results can also include handicap review, caps, exceptional score reductions, and 9-hole expected differential handling.

Tool guide

Use the result as a better starting point.

How it works

Quick context before you trust the number.

The calculator turns each complete 18-hole score into a WHS-style score differential, sorts the valid differentials, and applies the lowest-differentials table for the number of rounds entered.

What inputs mean

Use normal playing numbers, not best-ever outliers.

Adjusted gross score is your score after max-hole adjustments. Course Rating measures scratch-player difficulty, Slope Rating normalizes relative difficulty, and PCC accounts for unusual playing conditions.

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