Course Slope Adjusted Score Calculator

Compute actual gross-score/course-rating/PCC slope-adjusted differentials, not lowest-score index selection or automatic course policy lookup.

Description

A golf score differential compares adjusted score with course rating and playing-condition correction.

A golf score differential compares adjusted score with course rating and playing-condition correction. Slope rescales that difference.^{[1, 2]}

The returned values include Slope adjusted score differentials. The How section below explains the calculation, input rules and interpretation.

When to use Course Slope Adjusted Score Calculator

Use Course Slope Adjusted Score Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No automatic course lookup, score adjustment or handicap-index selection is supplied.

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 Course Slope Adjusted Score 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 observedAdjustedGrossScores, callerCourseRatings, callerSlopeRatings, callerPlayingConditionCorrections using the field table and calculation rules, then run the tool.
Read slopeAdjustedScoreDifferentials. 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
observedAdjustedGrossScores	Observed adjusted gross scores	list of number	Required
callerCourseRatings	Caller course ratings	list of number	Required
callerSlopeRatings	Caller slope ratings	list of number	Required
callerPlayingConditionCorrections	Caller playing condition corrections	list of number	Required

Enter aligned nonempty finite score/rating/PCC observations and positive slopes. Return signed unrounded differentials.

differential=113/slope×(adjustedGross−courseRating−PCC)

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
slopeAdjustedScoreDifferentials	Slope adjusted score differentials	list of number

json

{
  "input": {
    "observedAdjustedGrossScores": [
      90,
      85
    ],
    "callerCourseRatings": [
      72,
      70
    ],
    "callerSlopeRatings": [
      113,
      130
    ],
    "callerPlayingConditionCorrections": [
      0,
      1
    ]
  },
  "output": {
    "slopeAdjustedScoreDifferentials": [
      18,
      12.169230769230769
    ]
  }
}

Limitations and assumptions

No automatic course lookup, score adjustment or handicap-index selection is supplied.

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 USGA Golf Handicap Index Calculator: A handicap-index scenario needs an explicit differential-selection policy. Multiplier, adjustment and cap depend on the caller’s chosen rules. For a complementary task, use Putts Per Round Average Calculator: Putts per hole can normalize partial and full rounds consistently. It differs from averaging unequal round totals.

Further background: Rules of Handicapping: 5.1a, 18-hole Score Differential.

References

Course Slope Adjusted Score Calculator — tool.io
Rules of Handicapping: 5.1a, 18-hole Score Differential — United States Golf Association

Similar or alternative tools

USGA Golf Handicap Index Calculator
A handicap-index scenario needs an explicit differential-selection policy. Multiplier, adjustment and cap depend on the caller’s chosen rules.
Putts Per Round Average Calculator
Putts per hole can normalize partial and full rounds consistently. It differs from averaging unequal round totals.