Course Rating and Slope, Explained

You pull up to a new course on a golf trip, hand the pro shop your name, and get a scorecard with a block of numbers you half-remember from your home club: something like 72.4 and 132 next to the back tees, smaller numbers next to the forward ones. Most golfers glance past them and pick the tees they always play. That's the mistake. Those two numbers, Course Rating and Slope Rating, are the only objective description of how hard this specific course plays, and they're printed separately for every set of tees for exactly that reason.

Course Rating: what a scratch golfer should shoot here

Course Rating is the expected score for a scratch golfer, a player with a 0.0 Handicap Index, playing that set of tees under normal conditions. It's expressed to one decimal place, so a 72.4 means a scratch golfer is expected to average 72.4 there, not 72 flat. A course with a 74.8 Course Rating from the tips is a harder scratch test than one rated 69.5, full stop, regardless of what either course's par says on the card.

Slope Rating: what it does to everyone else

Slope Rating is where the number gets useful for everyone else in your foursome. It runs from 55 to 155, with 113 defined as standard, average difficulty, per the USGA's own World Handicap System. Slope measures how much harder that set of tees plays for a bogey golfer relative to a scratch golfer, compared to that same relationship at an average course. A course rated 155 punishes a bogey golfer, relative to a scratch player, far more severely than a course rated 113 does.

A high slope doesn't mean the course is long, and it doesn't mean par is hard to make. It means the gap between how a scratch player scores there and how a bogey player scores there is wider than normal, usually because of forced carries, narrow landing areas, penal rough, or greens that get ugly fast once you miss them. A 15-handicap looking at a 148 slope should expect the day to feel harder than the yardage alone suggests. That's not a guess. It's the number telling you so before you tee off.

Who actually sets these numbers

Neither number is invented by the course. Course Rating and Slope Rating are set under the USGA Course Rating System by Allied Golf Associations, the state and regional bodies the USGA licenses to rate every course in their territory. Internationally, the same math runs through the World Handicap System, jointly developed by the USGA and The R&A, which co-governs the game outside the US and Mexico, per The R&A's own Rules of Golf page. A course can't inflate its own slope to sound tougher than it plays, and every set of tees gets its own rating and slope, which is why the numbers change tee box to tee box on the same card.

Picking the right tees, and what it does to your handicap

This is the part that changes how your round actually goes: play the tees whose rating and slope match your game, not the tees that match your ego. Two courses can share a par of 72 and play nothing alike, one a 68.9/118 that a mid-handicapper can attack, the other a 74.2/145 that turns the same handicap into a survival round. Compare the slope from the tees you're considering against your home course's slope before the trip. A jump from 122 to 148 is a real jump in difficulty, not a rounding error.

Slope also does concrete work in your Course Handicap for the day. Under the World Handicap System, Course Handicap equals your Handicap Index multiplied by Slope Rating divided by 113, with a further adjustment for how that course's Course Rating compares to its par, per the USGA's own Course Handicap page. Play a tougher slope and your Course Handicap climbs above your Handicap Index for the day; play an easier one and it drops below it. That's the whole point of the system: the same golfer gets a fair number of strokes no matter which course, or which tees, they're standing on.

Next time a scorecard hands you a Course Rating and Slope, skip the tees you always play out of habit. Find the pair whose numbers match your actual game, and you've made the best decision of the round before you've hit a shot.

For more on the game itself, see Golf Talk, and if the points side of the trip still needs sorting out, Points & Miles covers that. The 19th Hole newsletter rounds up pieces like this one before your next tee time.