Method
Differential = 113/slope × (adjusted score − Course Rating − PCC); the WHS small-record table selects the lowest differentials.
Everyday worksheet
Golf Handicap Index Estimator
Estimate an unofficial index from recent adjusted scores, one course rating and slope, with selected-low differential audit.
The calculation runs locally. Results include the intermediate values, unit conversions and assumptions needed to audit the answer.
Method, assumptions and practical use
How the Golf Handicap Index Estimator works
Differential = 113/slope × (adjusted score − Course Rating − PCC); the WHS small-record table selects the lowest differentials. Inputs stay in this browser, and the result table exposes conversions and assumptions for independent checking.
Interpret the result
Lower differentials represent stronger performance relative to the rated course difficulty.
Check the assumptions
Unofficial estimate only; it omits caps, exceptional-score reductions, Committee adjustments and system-managed PCC.
Local calculation
Everything runs in this browser. Inputs are not sent to an external calculator.
Rounding
Displayed values may be rounded for readability while calculations use full floating-point precision unless the tool explicitly uses exact integers.
Scope
Unofficial estimate only; it omits caps, exceptional-score reductions, Committee adjustments and system-managed PCC.
Simple by design
Three steps to a clearer number.
Enter your details
Use realistic values in each field. You can change them anytime.
Calculate instantly
The formula runs locally, so there is no account or waiting time.
Use the result
Treat the answer as a practical estimate for your next decision.