What is a score differential?

A score differential measures your performance relative to the difficulty of the course. The formula is: (Adjusted Gross Score − Course Rating) × 113 ÷ Slope Rating. Most golf apps and scorecards provide this automatically.

How many differentials does WHS use?

WHS uses between 1 and 8 of your lowest differentials depending on how many you have recorded, following a specific lookup table. For example, with 20 differentials it uses the lowest 8; with 5 differentials it uses the lowest 1.

Does WHS use the old 0.96 multiplier?

No. The 0.96 bonus-for-excellence multiplier belonged to the pre-2020 USGA Handicap System and is not part of the WHS Handicap Index calculation. PCC, when applicable, is already included in each Score Differential.

What is the maximum Handicap Index?

Under the World Handicap System, the maximum Handicap Index is 54.0 for all players, regardless of gender. This replaced the previous separate male/female maximums.

Do I need a minimum number of rounds?

You need at least 3 score differentials to receive a Handicap Index under WHS. With fewer than 3 differentials, a handicap cannot be calculated.

Is this calculator official?

This tool applies the published WHS formula for educational and estimation purposes. Official Handicap Indexes are issued by authorized golf associations and clubs that also account for exceptional score reductions and other adjustments.

Golf Handicap Calculator

Enter 3–20 score differentials to estimate a Handicap Index with the World Handicap System (WHS) Rule 5.2 table.

Score Differentials

Enter between 3 and 20 differentials. Add them one by one or paste a comma-separated list.

Paste comma-separated list

Entered Differentials 0 / 20

No differentials added yet.

Add at least 3 score differentials and click
Calculate Handicap Index.

Your Handicap Index

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Calculation Breakdown

Total Differentials

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Differentials Used (WHS)

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Average of Best Rounds

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After WHS Table Adjustment

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Best Rounds Selected

Round	Differential

WHS Lookup Table

Differentials entered	Used / adjustment
3	1 lowest / −2.0
4	1 lowest / −1.0
5	1 lowest / 0
6	2 lowest / −1.0
7 – 8	2 lowest / 0
9 – 11	3 lowest / 0
12 – 14	4 lowest / 0
15 – 16	5 lowest / 0
17 – 18	6 lowest / 0
19	7 lowest / 0
20	8 lowest / 0

Summary

This tool estimates a Handicap Index using the current WHS Rule 5.2 table: it selects the required lowest differentials, applies the table adjustment for short records, and rounds to the nearest tenth. It cannot reproduce safeguards that require record history, such as exceptional-score reductions or soft/hard caps based on a Low Handicap Index; only an authorized service issues an official index.

How it works

Enter each score differential (Adjusted Gross Score minus Course Rating, divided by Slope Rating, multiplied by 113) for your recent rounds.
The WHS lookup table determines how many of your lowest differentials to use based on the total number you enter.
The selected lowest differentials are averaged.
For 3, 4, or 6 differentials, the Rule 5.2 table adjustment is applied.
The result is rounded to the nearest tenth and capped at the maximum 54.0.

Use cases

Track your improving or declining performance over multiple rounds.
Confirm your club-issued handicap index matches the official WHS formula.
Estimate your handicap before your club officially processes new scores.
Compare handicap index changes as you add more rounds over time.
Learn how the WHS formula weights your best recent performances.
Calculate a provisional handicap when joining a new club.

Frequently Asked Questions

Last updated: 2026-05-29 · Reviewed by Nham Vu