What is the official WHS Score Differential formula?

Score Differential = (113 / Slope Rating) × (Adjusted Gross Score - Course Rating - PCC adjustments). The number 113 represents the standard slope rating of a course of average relative difficulty.

How many rounds are required to establish an official Handicap Index?

Under the World Handicap System, you can establish an initial handicap with as few as 54 holes (three 18-hole rounds or six 9-hole rounds). Once you reach 20 submitted scores, your index averages the lowest 8 differentials.

What is the difference between Course Rating and Slope Rating?

Course Rating reflects the evaluation of playing difficulty for a scratch golfer (zero handicap) under normal weather conditions. Slope Rating measures the relative difficulty of the course for a bogey golfer compared to a scratch golfer (ranging from 55 to 155).

What are the WHS Soft Cap and Hard Cap rules?

The Soft Cap activates when your new index rises more than 3.0 strokes above your Lowest Handicap Index in the past 365 days; increases beyond 3.0 are halved (reduced by 50%). The Hard Cap sets an absolute limit of 5.0 strokes above your lowest index.

How does the Course Handicap formula account for Par?

Course Handicap = Handicap Index × (Slope Rating / 113) + (Course Rating - Par). Incorporating (Course Rating - Par) ensures that players competing from different tee boxes with different pars can compete directly without manual score adjustments.

Mobile & Tech

Golf Handicap Index (WHS), Course Rating & Score Differential Calculator

Name: Golf Handicap Index (WHS), Course Rating & Score Differential Calculator
Author: AnshuTechy

Calculate your official World Handicap System (WHS) Handicap Index, 18-hole and 9-hole Score Differentials, Course Handicap, and Playing Handicap based on USGA Course Rating and Slope Rating.Documentation & FAQs ↓

Golf Handicap Index (WHS), Course Rating & Score Differential Calculator — Interactive Console

Runs locally in your browser • Instant output

Golf Handicap Score Differential & Official WHS Engine

USGA / R&A World Handicap System (WHS) formula engine, 20-round ledger simulator, soft/hard cap suppression & playing handicap converter.

Handicap Index:7.2

Round Score Differential Calculator

ADJUSTED GROSS SCORE

COURSE RATING

SLOPE RATING (55-155)

PCC ADJUSTMENT

SCORE DIFFERENTIAL FORMULA11.6

(113 / 125) × (84 - 71.2 - 0) = 11.6

Tee Box Course & Playing Handicap Converter

TARGET RATING

TARGET SLOPE

PAR

HANDICAP ALLOWANCE

COURSE HANDICAP

8.3

Unrounded Strokes

PLAYING HANDICAP

Tee Strokes Allowed

Official WHS Handicap Index

7.2

Low HI (Trailing 365d): 7.8

Averaging Lowest 8 of 20

20-Round Scoring Ledger (★ = Counting Round)8 Counting Scores

Date	Course	Score	Rating / Slope	Differential
2026-09-28	Pebble Beach Golf Links	81	73.1 / 138	6.5★
2026-09-21	Spyglass Hill	85	74 / 140	8.9
2026-09-14	Spanish Bay	79	71.8 / 132	6.2★
2026-09-07	Cypress Point	83	72.4 / 136	8.8
2026-08-30	Pasatiempo Golf Club	86	72.5 / 137	10.3
2026-08-23	Torrey Pines South	84	74.8 / 143	7.3★
2026-08-16	Torrey Pines North	78	70.9 / 128	6.3★
2026-08-09	Bandon Dunes	82	72.6 / 135	7.9★
2026-08-02	Pacific Dunes	85	73 / 139	9.8
2026-07-26	Old Macdonald	80	71.4 / 130	7.5★
2026-07-19	Bandon Trails	83	72.8 / 134	8.6
2026-07-12	Sheep Ranch	79	70.5 / 125	7.7★
2026-07-05	Chambers Bay	88	74.2 / 139	11.2
2026-06-28	Olympic Club (Lake)	87	75.3 / 144	9.2
2026-06-21	TPC Harding Park	82	72.1 / 131	8.5
2026-06-14	Half Moon Bay (Ocean)	80	71 / 127	8★
2026-06-07	Half Moon Bay (Old)	84	71.6 / 129	10.9
2026-05-31	Presidio Golf Course	86	72.2 / 133	11.7
2026-05-24	Lincoln Park	77	68.4 / 118	8.2
2026-05-17	Sharp Park	81	69.8 / 121	10.5

Step-by-Step Instructions

4 Steps to Completion

1Phase 1

Enter your 18-hole Adjusted Gross Score, USGA Course Rating, and Slope Rating (found on your course scorecard).

2Phase 2

View your instant Score Differential calculated for that specific round.

3Phase 3

Add up to 20 recent differential scores to trigger the official WHS 'Lowest 8 of 20' averaging algorithm.

4Phase 4

Input a destination course's slope and rating to generate your exact Course Handicap and strokes given.

Practical Use Cases & Real-World Scenarios

Recreational Golfers Establishing a Handicap Index

Log your first 5 to 20 rounds to compute an accurate initial WHS handicap index for club competitions and peer matches.

Tee Box Course Handicap Conversions

Determine exactly how many handicap strokes you receive when moving between Championship Black, Blue, White, or Forward Red tees.

Match Play & Tournament Allowance Calculation

Calculate 95% stroke play or 100% four-ball match play handicap allowances for fair member-guest competitions.

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Golf Handicap Index (WHS), Course Rating & Score Differential Calculator

Golf Handicap Score Differential & Official WHS Engine

Step-by-Step Instructions

Practical Use Cases & Real-World Scenarios

Official WHS Score Differential Engine

8 of 20 Best Differential Averaging

Course & Playing Handicap Conversion

Soft & Hard Cap Anti-Surge Safeguards

Frequently Asked Questions

10 Best Golf Apps for Android & iPhone 2026

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