USGA Golf Handicap Index Calculator
Evaluate supplied USGA/WHS score differential selection/multiplier/adjustment policy with nearest-tenth index and caller cap; no inferred policy edition, membership eligibility, playing handicap or official certification.
Description
A golf handicap-index scenario needs an explicit differential-selection policy.
A golf handicap-index scenario needs an explicit differential-selection policy. Multiplier, adjustment and cap depend on the caller’s chosen rules.1, 2
The returned values include Selected score differentials, Caller computed handicap index. The How section below explains the calculation, input rules and interpretation.
When to use USGA Golf Handicap Index Calculator
Use USGA Golf Handicap Index Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No current policy edition, membership eligibility, playing handicap or official certification is inferred.
Prepare the observed race, match or training records and the stated units. Supply independently verified rule editions, calibration tables and targets where requested.
How to use USGA Golf Handicap Index Calculator and understand its results
- Prepare the observed race, match or training records and the stated units. Supply independently verified rule editions, calibration tables and targets where requested.
- Enter observedScoreDifferentials, callerLowestDifferentialsToUse, callerIndexMultiplier, callerExceptionalAdjustment, callerIndexUpperCap using the field table and calculation rules, then run the tool.
- Read selectedScoreDifferentials, callerComputedHandicapIndex. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| observedScoreDifferentials | Observed score differentials | list of number | Required |
| callerLowestDifferentialsToUse | Caller lowest differentials to use | number | Required |
| callerIndexMultiplier | Caller index multiplier | number | Required |
| callerExceptionalAdjustment | Caller exceptional adjustment | number | Required |
| callerIndexUpperCap | Caller index upper cap | number | Required |
Enter nonempty finite differentials bounded±100, integer N 1–list length, nonnegative multiplier/cap and finite signed adjustment. Sort, select N, apply adjustment/cap then Math.round to nearest tenth; negative half ties round toward positive infinity. Return selected values and index.
index=roundToTenth(min(cap,mean(lowestN)×multiplier+adjustment)) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| selectedScoreDifferentials | Selected score differentials | list of number |
| callerComputedHandicapIndex | Caller computed handicap index | number |
{
"input": {
"observedScoreDifferentials": [
10,
12,
15,
8,
11
],
"callerLowestDifferentialsToUse": 3,
"callerIndexMultiplier": 1,
"callerExceptionalAdjustment": 0,
"callerIndexUpperCap": 54
},
"output": {
"selectedScoreDifferentials": [
8,
10,
11
],
"callerComputedHandicapIndex": 9.7
}
}Limitations and assumptions
No current policy edition, membership eligibility, playing handicap or official certification is inferred.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Course Slope Adjusted Score Calculator: A golf score differential compares adjusted score with course rating and playing-condition correction. Slope rescales that difference. For a complementary task, use Strokes Gained Off-the-Tee Calculator: Tee-shot strokes gained compares benchmark expected strokes before and after actual shot/penalty costs. The benchmark is caller supplied.
Further background: The Handicap Index Calculation.
References
-
USGA Golf Handicap Index Calculator — tool.io
-
The Handicap Index Calculation — United States Golf Association
Similar or alternative tools
- Course Slope Adjusted Score Calculator
A golf score differential compares adjusted score with course rating and playing-condition correction. Slope rescales that difference.
- Strokes Gained Off-the-Tee Calculator
Tee-shot strokes gained compares benchmark expected strokes before and after actual shot/penalty costs. The benchmark is caller supplied.