Golf Handicap Differential Calculator
Enter your adjusted gross score along with the course rating and slope rating to calculate that round's handicap differential.
Golf Handicap Differential Calculator
Calculates a single round's handicap differential from your adjusted gross score, the course rating and the slope rating.
This calculator computes a single round's handicap differential using the standard, publicly documented formula (adjusted gross score minus course rating, multiplied by 113, divided by slope rating) that underpins modern golf handicap systems. A full handicap index is built by averaging several of your best recent differentials, but this calculator lets you quickly check the differential for any one round given its course rating and slope rating.
Example
- With the default values shown above, this calculator returns: Handicap Differential ≈ 18.5.
Frequently Asked Questions
What is a handicap differential?
It's a standardized measure of how a single round compares to the difficulty of the course played, calculated as (adjusted score - course rating) × 113 / slope rating, using the widely documented USGA-style formula.
Why 113 in the formula?
113 is the slope rating of a course of 'standard' difficulty, used as the reference constant in the handicap differential formula so results are comparable across courses of different slope ratings.
Is one round's differential the same as my handicap index?
No — an official handicap index is typically derived by averaging a number of your best recent differentials over multiple rounds, not from a single round's differential alone.
Sources
- Standard formula, publicly documented method