A par-72 scorecard lists 71.2/128 for the tees you plan to play. The first number looks like a score. The second is often used as shorthand for difficulty.
Course Rating establishes a scoring level for a scratch golfer. Slope Rating describes how the challenge changes away from scratch ability.
Course Rating estimates the score a scratch golfer would be expected to shoot on a good round under normal conditions. Slope Rating describes how much more difficult the course is for non-scratch golfers relative to scratch golfers. Course Rating measures a scoring level, while Slope Rating measures relative difficulty.
Scratch Scoring Baseline
Shown as a decimal such as 71.2. It represents the scoring level of the selected tees for a scratch golfer under normal conditions.
Relative Difficulty
Shown as a whole number such as 128. It describes how difficulty increases for non-scratch golfers relative to scratch golfers.
What Is Course Rating?
Course Rating evaluates a course and tee set for a scratch player with a Handicap Index of 0.0. It is expressed to one decimal place.
If par is 72 and Course Rating is 71.2, the scratch scoring baseline is around 71.2 under normal conditions. The rating retains its decimal even though an actual score does not.
Course Rating does not have to equal par:
Course Rating 70.4 on par 72: The rated scoring level for a scratch player is 1.6 strokes below par.
Course Rating 73.1 on par 72: The rated scoring level is 1.1 strokes above par.
It does not predict one round. Weather, setup, hole locations, and player performance still affect the score. It is a standardized baseline for those tees.
The USGA definition applies to selected tees, not the property as one fixed layout.
What Is Bogey Rating?
Bogey Rating is the corresponding evaluation for a bogey player. It represents that player's scoring level under normal conditions when playing to the defined standard.
Scorecards often omit Bogey Rating, but Slope Rating is determined from its relationship with Course Rating.
The wider the scoring gap, the higher the Slope. It measures how difficulty for a non-scratch player changes relative to the scratch baseline.
What Is Slope Rating?
Slope Rating indicates relative difficulty for non-scratch players compared with scratch players. The World Handicap System range is 55 to 155.
A Slope of 113 represents standard relative difficulty. It is a fixed calculation reference, not necessarily the average of all courses.
Above 113, the challenge increases more quickly for non-scratch players relative to scratch. Below 113, it increases less quickly.
Slope is not an expected score. A rating of 128 does not predict 128 strokes or mean the course is 15 strokes harder than one rated 113.
The USGA guide explains that Slope comes from the scratch and bogey evaluations.
Course Rating vs. Slope Rating at a Glance
| Item | Course Rating | Slope Rating |
|---|---|---|
| Reference player | Scratch player | Non-scratch player relative to scratch |
| Number format | 71.2 | 128 |
| Compared directly with par | Yes | No |
| Main meaning | Expected scoring level for scratch ability | Rate at which relative difficulty increases |
| Used in Course Handicap | Yes | Yes |
On 71.2/128, the usual order is Course Rating first and Slope second. Confirm the headings because layouts differ.
Why a Higher Slope Does Not Always Mean a Harder Course
Slope is not an overall difficulty ranking. It describes how the tees affect scratch and non-scratch players differently.
A demanding scratch baseline can carry a moderate Slope. Another course may have a lower Course Rating but a higher Slope because its trouble becomes costlier for less-controlled play.
The second course has the steeper relative increase, but not automatically the higher scoring level for every golfer. Read both ratings with par, tees, and Handicap Index.
The USGA comparison explains why Slope alone cannot identify the harder course.
A Two-Course Example
The following numbers are teaching examples, not ratings for actual courses:
| Course | Par | Course Rating | Slope Rating |
|---|---|---|---|
| A | 72 | 72.8 | 121 |
| B | 72 | 70.5 | 132 |
Course A has the higher scratch baseline: 72.8 compared with 70.5 at Course B.
Course B has the higher Slope, so difficulty grows more sharply for non-scratch players relative to its lower baseline.
That does not prove a bogey golfer will score higher on B. Its Course Rating starts 2.3 strokes lower while its Slope is 11 points higher. Both ratings and the golfer's Index are needed.
Calling B harder only because its Slope is 132 ignores the lower starting baseline.
What Factors Affect Course and Slope Ratings?
A rating team does more than measure the scorecard yardage. The process evaluates effective playing length and obstacles as they affect both scratch and bogey players.
Effective Playing Length
- Roll after landing
- Prevailing wind
- Elevation changes within the course
- Altitude
- Doglegs
- Forced layups
Obstacle Evaluation
- Fairway landing areas
- Rough and recoverability
- Bunkers
- Penalty areas
- Trees
- Green targets and surfaces
The position of trouble matters as much as its presence because scratch and bogey players may reach different landing zones or approach the same green with different clubs.
The full categories are set out in Appendix G of the Rules of Handicapping. Ratings describe the course under normal conditions, not the temporary effect of one unusually windy afternoon or one difficult hole location.
Why Does Every Set of Tees Have Its Own Ratings?
Moving tees changes more than total yardage. It can change a forced carry, bring a bunker into the landing area, alter the club used for an approach, or remove the need for a layup.
Those differences change the scratch and bogey evaluations, so each rated tee set has its own Course Rating and Slope Rating. The same golfer might see 69.8/118 from one tee and 73.0/135 from another without the course itself changing.
Use the values assigned to the tees actually played. Choosing the wrong line from the scorecard or handicap app can change the Course Handicap and the Score Differential produced after the round.
This is one reason choosing the right golf tees requires more than selecting a familiar color.
How Do the Ratings Affect Course Handicap?
Both values enter the Course Handicap calculation:
Course Handicap = Handicap Index × (Slope Rating / 113) + (Course Rating − par)
Slope Rating adjusts the Index for relative difficulty. Course Rating minus par moves the result according to the scratch scoring baseline of those tees.
This is why a Course Handicap is not simply the Handicap Index rounded to a whole number. A complete worked example is available in Handicap Index vs. Course Handicap.
If the golfer does not yet have an official Index, the registration and score-posting process is covered in How to Get a Golf Handicap in the US.
How Should Golfers Use These Numbers?
Use Course Rating and Slope Rating as context rather than a one-number verdict:
Identify the exact tees you plan to play.
Compare Course Rating with par to understand the scratch baseline.
Compare Slope Rating with 113 to understand the relative increase for non-scratch play.
Calculate the Course Handicap using both ratings and your current Index.
When posting, select the same course and tees used during the round.
The ratings can help explain why your Course Handicap changes, why the same gross score can produce different Score Differentials, and why two courses of similar length can test different parts of the game.
BirdiLens keeps hole-by-hole scores in one place and uses recent rounds to provide an estimated handicap, making it easier to follow how your game is trending over time. For formal play, the official Handicap Index, selected tees, and competition format still determine the handicap used.
Read the Two Numbers Together
Course Rating and Slope Rating describe different parts of the same difficulty model. Course Rating sets the expected scoring level for scratch ability. Slope Rating describes how the gap changes for golfers who are not scratch.
On the scorecard, read 71.2/128 as a pair. Compare 71.2 with par, compare 128 with the standard Slope of 113, and use both with the tee selection and Handicap Index.
That provides more useful information than labeling every 128 course "hard" without context.
Frequently Asked Questions
Is a Slope Rating of 130 difficult?
It indicates that difficulty rises more quickly for non-scratch golfers than it does at the standard Slope of 113. It may present a meaningful challenge for a higher-index golfer, but Course Rating, par, tees, and the player's Index are still needed to judge the overall scoring test.
Is 113 an average or standard Slope Rating?
It is the standard reference value used by the World Handicap System. It should not be interpreted as proof that 113 is the current statistical average of all golf courses.
Can Course Rating be lower than par?
Yes. A par-72 tee set can have a Course Rating of 70.5, meaning the scratch scoring baseline is 1.5 strokes below par under normal conditions.
Which matters more, Course Rating or Slope Rating?
Neither gives the full answer alone. Course Rating supplies the scratch baseline, while Slope Rating describes the relative increase for non-scratch golfers. Both are used in the Course Handicap formula.
Do different tees have different ratings?
Yes. Tee position changes effective playing length and how obstacles affect scratch and bogey players, so each rated tee set has its own Course Rating and Slope Rating.
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What Is the Difference Between Handicap Index and Course Handicap?