Golf handicap calculator

Convert an existing Handicap Index to an 18-hole Course Handicap and a playing allowance.

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Existing Handicap Index, negative for plus index

18-hole Slope Rating

More inputs and assumptions

18-hole Course Rating

18-hole par

Playing allowance (%)

Answer

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Convert an existing Handicap Index to an 18-hole Course Handicap and a playing allowance.

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Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

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Formula and assumptions

Uses index times slope/113 plus course rating minus par. Enter a plus index as a negative number. The playing calculation applies your allowance to the unrounded course value, then rounds to the nearest integer with halves toward positive infinity. This does not create an official Handicap Index from scores or post a score. Your association and competition committee determine ratings and allowances.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-29

Using Golf handicap calculator

Convert an existing Handicap Index to an 18-hole Course Handicap and a playing allowance.

Next: Percentage calculator

Next: Basic calculator

A worked example

For existing handicap index, negative for plus index = 12, 18-hole slope rating = 113, 18-hole course rating = 72, 18-hole par = 72, playing allowance (%) = 100, calculated course handicap = 12.

Before you use the result

Example results for existing handicap index, negative for plus index

These examples use 18-hole Slope Rating: 113; 18-hole Course Rating: 72; 18-hole par: 72; Playing allowance (%): 100. They are reference calculations, not recommended settings.

Existing Handicap Index, negative for plus index	Calculated Course Handicap
6	6
12	12
24	24

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