golf_course

Golf Handicap Calculator | Compute handicap differential from a round

Quick reference

Term	Meaning
Course rating	Expected score for a scratch golfer
Slope rating	Difficulty for a bogey golfer (55–155)
113	Slope of a standard-difficulty course

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Interpretation guide

Handicap index	Skill level
0 or below	Scratch / professional
1–9	Low (skilled amateur)
10–18	Average club golfer
19–28+	Higher handicap

lightbulb Worked example — an 88 on a tough course

Adjusted gross score 88, course rating 71.5, slope 133. Differential = (88 − 71.5) × 113 ÷ 133 = 16.5 × 113 ÷ 133.

Result: 14.0 (16.5 × 113 = 1,864.5; ÷ 133 = 14.02).

What this means: On an average-difficulty course (slope 113) that same 88 would be a 14.6 differential — the 133 slope makes this round count for less because the course is harder. Your handicap index is built from the average of your best 8 such differentials from the last 20 rounds.

Formula & methodology

Formula: Differential = (adjusted score − course rating) × 113 / slope rating

How the differential is calculated

Under the World Handicap System: differential = (adjusted gross score − course rating) × 113 ÷ slope rating.

Adjusted score caps each hole at net double bogey before the math starts.
113 is the slope rating of an average-difficulty course, which normalizes rounds across easy and hard courses.
Differentials round to one decimal; the handicap index averages the best 8 of your last 20, times 0.96.

Authoritative source: timeanddate.com

Frequently asked questions

How do you calculate a golf handicap?

Enter the required values into the input fields and press the calculate button. The tool applies the formula Differential = (adjusted score − course rating) × 113 / slope rating and returns the result with a short explanation of each step, so you can check the working yourself.

What is a score differential?

The Golf Handicap Calculator is free, private, and accurate: it runs entirely in your browser (no uploads, no accounts), applies the standard calculation, and explains each step so you can verify the result. Calculates a golf handicap differential from any round. Enter your score, the course rating, and the slope rating, and the tool applies the World Handicap System formula — (score − course rating) × 113 ÷ slope — to return your differential, which you can use There is no limit on usage, and it works on any device.

What is slope rating?

The slope rating measures a course's difficulty for a bogey golfer relative to a scratch golfer, on a scale centered at 113 — higher slopes punish higher handicaps more. It converts your score into a differential with the formula (score − course rating) × 113 ÷ slope. Two courses with the same rating but different slopes produce different differentials for the same score.

What is course rating?

The course rating is the score a scratch (0 handicap) golfer is expected to shoot on that course, typically 68–75 depending on length and difficulty. It is the baseline the differential formula subtracts from your score. A course rated 71.5 means a scratch golfer should average about 71.5 strokes; the rating accounts for length, obstacles, and green difficulty.

How many rounds do I need for a handicap?

Under the World Handicap System, a handicap index requires at least 3 scores to begin, and the index uses the best 8 of your last 20 differentials once you have enough rounds. With fewer than 20 rounds, a smaller set is used with an adjustment. The calculator computes each round's differential; your index is built from the best scores in that set.

Does it use my adjusted gross score?

Yes — enter your score after applying net double bogey, the maximum per hole under WHS (double bogey plus any handicap strokes you get there). A blow-up 9 on a hole where you get one stroke counts as 7. Using the raw score would inflate your differential unfairly.

Why multiply by 113?

113 is the slope rating of a course of average difficulty, so dividing by the actual slope and multiplying by 113 normalizes your round to that standard. A differential of 15 means you played like a 15-handicapper on an average course, whichever course you actually played.

Is my data sent anywhere when I calculate?

No — the differential math runs on the page itself, so your scores never leave your device.

How precise is the differential?

Exact to the WHS formula, rounded to one decimal as official handicapping does. Your handicap index itself is a separate step: the average of your best 8 of 20 differentials, multiplied by 0.96.

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