How to Calculate Course & Slope Rating
While course ratings are a measure of the difficulty of a course, slope ratings are a measure of how much more difficult a course is for a high handicap golfer versus a lower one. For example, if you have two courses that each have a course rating of 72, they should be the same difficulty for a scratch golfer.
The Course Rating is calculated from the effective playing length and obstacle factors for 9 or 18 designated holes. The Course Rating is expressed in strokes to one decimal point and represents the expected score for a scratch player. The Bogey Rating represents the expected score for a bogey player.
What is slope rating
The Slope Rating measures the difficulty of a golf course for a bogey golfer. The Course Rating and the Slope Rating typically are printed on the scorecard for a golf course.
A Course Rating measures the difficulty of a golf course and is a crucial component in determining a player's handicap. The Slope Rating measures the difficulty of a golf course for a bogey golfer. The Course Rating and the Slope Rating typically are printed on the scorecard for a golf course.
A typical scratch golfer, as defined by the USGA, hits 250-yard drives and can reach a 470-yard hole in two strokes. A typical female scratch golfer hits drives 210 yards and can reach a 400-yard hole in two strokes.
In addition to the raw length of the hole, the USGA team considers other factors that might affect the "true" playing length of a hole, including the amount of roll, elevation, doglegs or forced lay-ups, prevailing wind direction and altitude . The team also considers a number of potential obstacles, such as sidehill lies, width of fairways, difficulty of hitting the green, difficulty of the rough, bunkers, out-of-bounds areas, water hazards, green speed and the number of obstacles close to a landing area, which the USGA labels the "psychological" factor.
If an easy par-70 layout was rated a minus 2.0, the Course Rating would be 68.0. A typical scratch golfer should therefore shoot 75 on the difficult course and 68 on the easy course under good playing conditions.
Jim Thomas has been a freelance writer since 1978. He wrote a book about professional golfers and has written magazine articles about sports, politics, legal issues, travel and business for national and Northwest publications. He received a Juris Doctor from Duke Law School and a Bachelor of Science in political science from Whitman College.
This scorecard shows the course rating (first number) and slope rating (second number) for each set of tees at a course.
As you may have figured out already, golf is a difficult game and contains a very wide range of golfers, each with very different levels of skill. In the mid 80’s the USGA started to catch on to this big divide between scratch or professional golfers and mid to high handicap golfers.
It turns out that that statistically, no matter how easy or hard a course is, scratch golfers will almost always shoot in the high 60’s to low 70’s. While this might not seem like a big deal, having a very narrow spread of scores even on courses that are much easier or harder than average ones creates a rating that underestimates changes in course difficulties for the rest of the golfing population. However, they also realized that this phenomenon was the exact opposite for mid-high handicap golfers. While one course might only play slightly harder in the eyes of a scratch golfer, less proficient golfers might find their scores to be significantly higher on this new, harder course.
If you’re interested in calculating your handicap for a particular course, multiply your handicap by the course rating divided by 113. This will adjust your handicap to the difficulty of the course.
While the course and slope ratings of a golf course are unlikely to change dramatically, they are usually re-evaluated every 4-5 years.
While frequently unused by new or casual golfers, slope and course rating are two of golf’s most important, and most commonly confused numbers. These two numbers might be a seemingly random arrangement of numbers on your scorecard, but in reality , they are two of the great equalizers in the game of golf.
For example, if you have two courses that each have a course rating of 72, they should be the same difficulty for a scratch golfer. However, if bogey-golfers on course A averages a score of 90 while bogey-golfers on course B average a score of 95 the slope rating for course B would be higher than for course A; indicating a higher level of difficulty for higher handicap players.
A golf course rating is a number that tells you what a scratch golfer should be shooting at that golf course. Scratch golfers are known for their ability to shoot par on a golf course. However, not all golf courses are made to be the same difficult.
If a scratch golfer plays this course and shoots a 74, the player’s handicap differential would still be zero. Therefore the golfer’s handicap index is not going to be adjusted or changed all that much because they were playing a more challenging golf course.
A higher golf course rating means that the course raters have decided that it is much harder for a scratch golfer to shoot par at the golf course. Chances are the course rating is closer to 74 or even 75, and therefore that is what a typical scratch player would shoot.
The handicap system allows bogey golfers to have a fair match against scratch golfers, which makes golf such a special and vital sport.
The concept of the USGA course rating system is to help ensure that you can play any golf course and have a good idea of what you are getting yourself involved in.
The slope values can range anywhere from 55 to 155. The average golf course is 113. This may seem like an odd number for a bogey golfer to have to remember and base their golf round off of. The United States Golf Association came up with these systems, and they work pretty well, but there is undoubtedly a learning curve involved.
The handicap index is created by calculating an average of 20 score differentials of a player. The score differential is the difference between your adjusted gross score and the course rating. Therefore if you are a golfer that shot 90 on a course with a 72.5 rating, your score differential would be 17.5.
Slope Rating is described by the USGA as demonstrating the “measurement of the relative playing difficulty of a course for players who are not scratch golfers, compared to scratch golfers”. The higher a course’s Slope Rating, the higher the expected difference of scoring between a scratch golfer and a bogey golfer.
To determine the Slope Rating for a course requires two key numbers – Course Rating and Bogey Rating. The Course Rating is the evaluation of the playing difficulty of a golf course for the scratch player (0 handicap.) The Bogey Rating is the evaluation of the difficulty of a course for a bogey player of 20-24 handicap.
113 is the average Slope Rating signifying a course of standard relative difficulty. The number 113 is used in calculating a player’s Course Handicap. Each player with a WHS Handicap Index can calculate their Course Handicap for any course by dividing the Slope Rating of that course by 113 and multiplying that number by their Handicap Index.
Course Rating and Bogey Rating are calculated using the USGA Course Rating System. The Course Rating System is extremely objective and takes into account all the factors that affect the playing difficulty of a course. It requires numerous specific measurements to be taken on each hole of the golf course assisting in the consistency of application by course rating teams.
Course Handicap is calculated by dividing Slope Rating by 113 and multiplying by Handicap Index.
There’s not really such a thing as an average Course Rating but there is an average, or standard, Slope Rating – the difference between Course Rating and Bogey Rating multiplied by a predetermined value – The average or standard Slope Rating is 113 .
The Slope Rating reflects the relative difficulty of a course for players who are not scratch golfers in comparison to scratch golfers. Golfers use the Slope Rating, a trademark of the United States Golf Association, to calculate handicap differentials. The rating falls between 55 and 155; the higher the number, the more challenging the course.
For male golfers, multiply the difference by 5.381; for women, multiply it by 4.24. Round to the nearest whole number. This is the Slope Rating. With a difference of 22 between the Bogey Rating and Course Rating, the Slope Rating is 118 for a man and 93 for a woman.
The rating for each set of tees is usually on your scorecard, or you can ask staff at the course for this information.
Golfers typically don't have access to the information used to calculate the Slope Rating, but understanding the formula makes the rating less confusing.
To put it another way: USGA Course Rating tells the best golfers how hard a golf course actually plays; USGA Slope Rating indicates how much harder the course plays for "regular" (meaning not among the best) golfers.
Slope rating (a term trademarked by the United States Golf Association) is a measurement of the difficulty of a golf course for bogey golfers relative to the course rating.
Because he plays on a course with a higher slope rating, Player A's handicap index will be lower than Player B's (when it is calculated using the slope ratings), despite the fact that they both average scores of 85. So when A and B get together to play, B will get those extra strokes he needs.
The most important role of a slope is leveling the playing field for players of different skill levels. For example, let's say Player A and Player B average 85 strokes each for 18 holes. But Player A's average is established on a very difficult course (say, a slope rating of 150), while Player B's average is established on a much easier course (say, a slope rating of 105). If handicaps were simply estimates of golfers' average scores, then these two players would have the same handicap index. But Player A is clearly the better golfer, and in a match between the two Player B would clearly need some strokes.
The minimum slope rating is 55 and the maximum is 155 (slope does not relate specifically to strokes played as course rating does). When the slope rating system was first put into effect, the USGA set the slope for an "average" golf course at 113; however, not many 18-hole golf courses have slope ratings that low.
The slope is primarily used in the United States, but golf associations in other countries are beginning to adopt slope or similar systems.
Brent Kelley is an award-winning sports journalist and golf expert with over 30 years in print and online journalism. Slope rating (a term trademarked by the United States Golf Association) is a measurement of the difficulty of a golf course for bogey golfers relative to the course rating.