Course Rating and Slope Rating: What They Mean and Why They Matter
Two numbers on every golf scorecard
If you look at the scorecard of any rated course, you'll see two numbers alongside each tee's par: the Course Rating and the Slope Rating. These are the two parameters the World Handicap System uses to compare difficulty between courses and calculate Score Differentials and Handicap Indexes.
Without these two numbers, it would be impossible to know whether an 82 on a hard course equals an 80 on an easier one.
What is Course Rating?
The Course Rating is the score expected from a scratch golfer (handicap 0) on that course in normal conditions. It's expressed with one decimal (e.g., 71.4) and tends to be close to par, though it can be slightly above or below depending on the actual difficulty.
- A par-72 course can have a Course Rating of 73.2 if it plays harder than the par suggests.
- A par-72 course can have a Course Rating of 70.8 if it plays easier than it looks.
It is calculated by a rating committee from the national federation (USGA in the US, R&A in the UK, etc.) that plays and measures the course following WHS criteria.
What is Slope Rating?
The Slope Rating measures how much harder that course is for a bogey golfer (roughly handicap 20 for men) compared to a scratch golfer. The range is 55 to 155, with the standard value set at 113.
- A Slope of 113 means the course is proportionally as demanding for a mid-handicapper as for an elite player.
- A Slope of 130 means the course penalises high-handicap players much more than low-handicappers — through rough, water hazards, obstacles, etc.
- A Slope of 90 indicates a forgiving course for all levels.
The higher the Slope, the more extra strokes you'll receive on that course.
Why two courses with the same par can have very different Slope ratings
Par only tells you how many strokes an expert player should need. It doesn't account for rough penalty, water hazards, bunkers, shot precision requirements, prevailing wind, or fairway width.
A par-72 course with punishing rough, water hazards on several holes, and small greens can have a Slope of 135. Another par-72 with wide fairways and generous greens can have a Slope of 105. A player with HI 20 will receive more strokes on the first one because it penalises their level more.
How Course Rating and Slope affect your handicap
In the Score Differential
Every round generates a differential using both numbers:
Score Differential = (Adjusted Score − Course Rating) × 113 / Slope Rating
By dividing by the Slope and multiplying by 113 (the standard), the system normalises course difficulty. A round of 85 on a Slope-130 course will have a lower (better) differential than an 85 on a Slope-100 course, because the former is objectively harder for high-handicappers.
In the Course Handicap
To calculate how many strokes you receive at a specific course:
Course Handicap = round(HI × Slope / 113 + (Course Rating − Par))
This means on a hard course (high Slope) you'll receive more strokes than on an easier one, even though your HI is the same.
Practical example
Suppose your HI is 18.0 and you're playing two courses:
| Course | Par | Course Rating | Slope | Course Handicap |
|---|---|---|---|---|
| Course A | 72 | 71.4 | 120 | round(18 × 120/113 + (71.4 – 72)) = round(19.1 – 0.6) = 19 |
| Course B | 72 | 69.8 | 98 | round(18 × 98/113 + (69.8 – 72)) = round(15.6 – 2.2) = 13 |
The same player receives 19 strokes at Course A and only 13 at Course B — not because their level changes, but because the two courses have very different difficulty levels for their playing level.
Where to find a course's Course Rating and Slope
In the US, official values are available through the USGA Course Rating database or on the course's official scorecard. Every tee set (back tees, middle tees, forward tees) has its own Course Rating and Slope, since playing from farther back is objectively harder.