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All calculatorsMethodology

Golf Course & Playing Handicap Calculator

Convert an established Handicap Index into an 18-hole Course Handicap and Playing Handicap using entered ratings, par and allowance with plus-handicap support.

Interactive calculator · Method GOLF_HANDICAP-USGA2024-1.0 · Last reviewed: 2026-11-05

Calculate your scenario

18-hole Course Handicap = signed Handicap Index × (Slope Rating/113) + (Course Rating − par).

Your inputs

Try an example

Default worked example. Edit the inputs to calculate your scenario.

Default worked example

Unrounded Course Handicap 10
Rounded Course Handicap (scoring adjustments) 10
Unrounded Playing Handicap 10
Playing Handicap 10
Entered allowance 100%

Course = 10 × (113/113) + (72 − 72). Apply 100% to the unrounded course value, then round to the nearest whole number; half-way values round toward the higher signed number.

How to use the calculator

Enter the Index magnitude and select regular or plus, then the 18-hole ratings, par and competition allowance. Read the rounded scoring and playing values separately.

What the result means

Use the established Index with the specific 18-hole tees. Plus handicaps give strokes back and are kept distinct from regular indexes.

Formula and units

18-hole Course Handicap = signed Handicap Index × (Slope Rating/113) + (Course Rating − par). Playing Handicap = unrounded Course Handicap × entered allowance/100; round only the final playing value. The separate rounded Course Handicap is for scoring adjustments. Nearest whole-number rounding uses .5 upwards on the signed number line, including negative plus-handicap values.

Worked examples

Index 10 at slope 113, rating/par 72, 100%: Established Handicap Index magnitude: 10 index; 18-hole Slope Rating: 113 rating; 18-hole Course Rating: 72 strokes; 18-hole par: 72 strokes; Entered handicap allowance: 100 %; Index sign: regular.
Example result: Unrounded Course Handicap: 10; Rounded Course Handicap (scoring adjustments): 10; Unrounded Playing Handicap: 10; Playing Handicap: 10; Entered allowance: 100%.

Index 10 at slope 130 with 90% allowance: Established Handicap Index magnitude: 10 index; 18-hole Slope Rating: 130 rating; 18-hole Course Rating: 71.2 strokes; 18-hole par: 72 strokes; Entered handicap allowance: 90 %; Index sign: regular.
Example result: Unrounded Course Handicap: 10.704424778761; Rounded Course Handicap (scoring adjustments): 11; Unrounded Playing Handicap: 9.633982300885; Playing Handicap: 10; Entered allowance: 90%.

Limitations and common mistakes

USGA Rules of Handicapping, effective 2024, Rules 6.1 and 6.2, consulted 2026-11-05. Independent of GHIN and USGA; no integration, official Index issuance, score-history calculation or course database. Enter an already-established Index and current 18-hole ratings. Supported magnitudes: regular 0–54, plus 0–10; slope 55–155, rating 40–90 and par 50–90. Other values and 9-hole/combined rounds are outside this tool. Competition terms, different-tee par adjustments and match-play stroke allocation are not modeled.

Rounding Course Handicap before applying the allowance, or treating a plus Index as a positive arithmetic value.

Sources and assumptions

Method GOLF_HANDICAP-USGA2024-1.0; last formula review 2026-11-05. Sources and their supported claims. Calculation methodology.

USGA: Rules of Handicapping, effective 2024, Rules 6.1 and 6.2. Apply the allowance to unrounded Course Handicap; round the final Playing Handicap to the nearest whole number with .5 upwards. USGA and The R&A: Handicap Committee Guide (January 2023), Plus Handicap Players. Plus handicaps are negative in arithmetic; half-way rounding of negative values moves toward zero.