Golf Handicap Index Calculator
Golf Handicap Index Calculator
Estimate your golf handicap index from your recent rounds. Enter each score with its course and slope rating to get the score differentials and your averaged index.
Inputs
Your Rounds
| Adjusted Score | Course Rating | Slope Rating | Score Differential | |||
|---|---|---|---|---|---|---|
50 – 200 Your total strokes for the round, after applying any net double bogey or maximum-score adjustment your handicap system uses. Use the adjusted gross score, not the raw score, for the most accurate differential. | 55 – 80 The course rating for the tees you played — the score a scratch golfer is expected to shoot, printed on the scorecard. It is usually close to par but not identical. | 55 – 155 How much harder the course plays for a bogey golfer than for a scratch golfer, from 55 to 155. A course of standard difficulty rates 113, which is why it appears in the differential formula. | The standardized measure of how you played one round, adjusted to a course of average difficulty. Your handicap index is built from these, not from raw scores. | |||
50 – 200 Your total strokes for the round, after applying any net double bogey or maximum-score adjustment your handicap system uses. Use the adjusted gross score, not the raw score, for the most accurate differential. | 55 – 80 The course rating for the tees you played — the score a scratch golfer is expected to shoot, printed on the scorecard. It is usually close to par but not identical. | 55 – 155 How much harder the course plays for a bogey golfer than for a scratch golfer, from 55 to 155. A course of standard difficulty rates 113, which is why it appears in the differential formula. | The standardized measure of how you played one round, adjusted to a course of average difficulty. Your handicap index is built from these, not from raw scores. | |||
50 – 200 Your total strokes for the round, after applying any net double bogey or maximum-score adjustment your handicap system uses. Use the adjusted gross score, not the raw score, for the most accurate differential. | 55 – 80 The course rating for the tees you played — the score a scratch golfer is expected to shoot, printed on the scorecard. It is usually close to par but not identical. | 55 – 155 How much harder the course plays for a bogey golfer than for a scratch golfer, from 55 to 155. A course of standard difficulty rates 113, which is why it appears in the differential formula. | The standardized measure of how you played one round, adjusted to a course of average difficulty. Your handicap index is built from these, not from raw scores. |
- #1Round50 – 200Your total strokes for the round, after applying any net double bogey or maximum-score adjustment your handicap system uses. Use the adjusted gross score, not the raw score, for the most accurate differential.55 – 80The course rating for the tees you played — the score a scratch golfer is expected to shoot, printed on the scorecard. It is usually close to par but not identical.55 – 155How much harder the course plays for a bogey golfer than for a scratch golfer, from 55 to 155. A course of standard difficulty rates 113, which is why it appears in the differential formula.DifferentialThe standardized measure of how you played one round, adjusted to a course of average difficulty. Your handicap index is built from these, not from raw scores.
- #2Round50 – 200Your total strokes for the round, after applying any net double bogey or maximum-score adjustment your handicap system uses. Use the adjusted gross score, not the raw score, for the most accurate differential.55 – 80The course rating for the tees you played — the score a scratch golfer is expected to shoot, printed on the scorecard. It is usually close to par but not identical.55 – 155How much harder the course plays for a bogey golfer than for a scratch golfer, from 55 to 155. A course of standard difficulty rates 113, which is why it appears in the differential formula.DifferentialThe standardized measure of how you played one round, adjusted to a course of average difficulty. Your handicap index is built from these, not from raw scores.
- #3Round50 – 200Your total strokes for the round, after applying any net double bogey or maximum-score adjustment your handicap system uses. Use the adjusted gross score, not the raw score, for the most accurate differential.55 – 80The course rating for the tees you played — the score a scratch golfer is expected to shoot, printed on the scorecard. It is usually close to par but not identical.55 – 155How much harder the course plays for a bogey golfer than for a scratch golfer, from 55 to 155. A course of standard difficulty rates 113, which is why it appears in the differential formula.DifferentialThe standardized measure of how you played one round, adjusted to a course of average difficulty. Your handicap index is built from these, not from raw scores.
Results
Enter a value to see results.
Across the rounds entered, your estimated handicap index is ....
One Number That Travels With You
A golf handicap exists to let players of different abilities compete fairly. Its modern form, the Handicap Index, is a single number that captures your demonstrated scoring ability and converts cleanly to strokes at any course in the world. This calculator estimates it from the rounds you enter.
How It Works
The index is built in two steps. First, every round is reduced to a score differential — a measure of how you played, standardized to a course of average difficulty:
D=(score−course rating)×slope rating113The course rating is what a scratch golfer is expected to shoot; the slope rating (55–155) describes how much harder the course is for an average golfer. Dividing by slope and multiplying by 113 — the slope of a standard course — puts an easy municipal round and a brutal championship round on the same scale.
Second, the differentials are averaged and scaled by the historic 0.96 "bonus for excellence" factor:
HI=D×0.96Worked Example
Three recent rounds:
| Round | Adjusted score | Course rating | Slope | Differential |
|---|---|---|---|---|
| 1 | 90 | 72.0 | 113 | 18.0 |
| 2 | 85 | 70.0 | 125 | 13.6 |
| 3 | 95 | 72.0 | 130 | 20.0 |
The average differential is , and the handicap index is .
Golf scoring is unitless and identical worldwide, so there is no metric/imperial distinction — a score of 90 and a slope of 113 mean the same thing on every continent.
Index vs. Course Handicap
Your handicap index is portable, but it is not the number of strokes you actually receive on a given day. Convert it to a course handicap for the specific tees you play:
Course Handicap=HI×113slopeA 16.5 index plays as an 18 at a course with slope 123, but only a 15 at a course with slope 103. Always convert before teeing off.
Reading the Result
- Enter your best recent rounds. The official World Handicap System averages only the best 8 of your most recent 20 differentials. Averaging every round — including bad days — will inflate the estimate.
- Trends matter more than a single value. Recalculate every few rounds; a falling index is the clearest sign your game is improving.
- This is an estimate. An official index applies caps and exceptional-score reductions this simplified average does not. Treat the result as a personal benchmark, not a competition handicap.
Frequently Asked Questions (FAQ)
How is the handicap index calculated?
Each round becomes a score differential: (adjusted score − course rating) × 113 ÷ slope rating. The handicap index is the average of those differentials, multiplied by 0.96 — a small "bonus for excellence" that nudges every index down slightly. This calculator averages all the rounds you enter, so enter your best recent rounds to mirror how the official system selects them.
What is slope rating and why is 113 in the formula?
Slope rating measures how much harder a course plays for an average ("bogey") golfer than for a scratch golfer. It ranges from 55 to 155, and 113 is the slope of a course of standard difficulty. Dividing by the slope and multiplying by 113 normalizes every round to that standard course, so differentials from easy and hard courses can be averaged together fairly.
Should I enter all my rounds or only my best?
The official World Handicap System looks at your most recent 20 rounds and averages only the best 8 differentials. This calculator averages every round you enter, so for the closest estimate enter your strongest recent scores. Adding a few poor rounds will raise the estimate above your official index.
What is the difference between handicap index and course handicap?
The handicap index is a single portable number that travels with you. A course handicap is the actual number of strokes you receive at a specific course and set of tees: course handicap = index × (slope ÷ 113), often with a course-rating adjustment. Always convert your index to a course handicap before a round.
Disclaimer
This is an unofficial estimate using the simplified average-of-entered method. It is not a substitute for an official handicap issued by an authorized golf association, which uses your best 8 of 20 rounds plus safeguards such as caps and exceptional-score reductions. Use it for personal tracking, not for official competition.
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