You're watching a playoff game tonight and the broadcast throws a number on screen next to a player's name. PER, 24.1. Nobody explains it. The announcers move on. Most fans file it under "higher is probably better" and forget about it ten seconds later.
That's a waste, because player efficiency rating is one of the few advanced stats that can change how you watch a game in real time. Here's PER explained the way it should've been the first time you saw it. What it measures, what the number means, and how to use it tonight instead of just nodding along.
What PER Actually Measures
PER stands for player efficiency rating. A stats writer named John Hollinger built it to do one thing: take everything a player does on the court, good and bad, and boil it down to a single number. Points, rebounds, assists, steals, blocks, and made threes go on the plus side. Missed shots, turnovers, and fouls go on the minus side. Add it all up, adjust for the math below, and you get one figure that travels with the player.
Two things separate PER from points per game. First, it's per minute. A guy who scores 12 in 18 minutes is doing more work than a guy who scores 14 in 34, and PER catches that. Second, it's adjusted for pace, so a player on a fast team doesn't get rewarded just because his team launches more shots. That's why you can stack a bench spark plug against a starter, or a player from a slow team against one that runs all night, and the number still means something.
The One Number You Need to Remember
League average PER is always 15. Hollinger built it that way on purpose. Every season, no matter how scoring trends move, the league average lands right at 15. That gives you an instant yardstick. Anything above 15 beats the average. Below it, a player is giving you less than a replacement-level rotation guy.
From there the tiers are easy to keep in your head:
- Around 15: a solid rotation player doing his job.
- 18 to 20: a good starter, knocking on the All-Star door.
- 22 to 25: a real All-Star.
- 25 to 30: superstar territory.
- 30 and up: an MVP-caliber season, the rarest air in the league.
For a live example, look at Victor Wembanyama this postseason. He's sitting around a 28 PER through his playoff run, which is squarely superstar tier. It lines up with the eye test too. He blocks shots, grabs boards, and scores inside and out. His raw line is split across so many columns that no single counting stat tells the story. PER pulls all of it into one figure and says, plainly, this guy is one of the best players alive right now.
The Minutes Trap That Fools People
Here's where PER plays tricks. Because it rewards production per minute, tiny samples go haywire. Early in these playoffs, rookie Jase Richardson posted a PER north of 80. Eighty. That's nearly triple an MVP season. Did he break basketball? No. He played three total minutes and happened to do good things in them. Stretch three minutes across a per-minute, pace-adjusted formula and the number detonates.
The fix is simple. Ignore PER for anyone who hasn't logged real minutes. A monster PER in garbage time is noise, nothing more. The stat only means something once a player has a real sample behind it, ideally a few hundred minutes or a full series. When you spot a wild number next to a deep-bench name, that's the formula stretching a handful of minutes, not a star being born.
What PER Leaves Out
PER has one big blind spot, and it's defense. It counts blocks and steals, but those two stats barely scratch what good defense is. A wing who erases the other team's best scorer without blocking a single shot gets almost no credit. Hollinger has admitted this himself. PER is mostly an offensive stat wearing an all-around costume.
So when you watch a lockdown defender carrying a middling PER, don't write him off. The number isn't built to see what he does. It's the same lesson as every other box-score stat. One figure never tells the whole story. Pair PER with your eyes and with a stat like plus-minus that tries to capture the impact PER misses. And if you want the efficiency side done cleaner, true shooting percentage is the partner stat for scoring.
How to Use PER While You Watch Tonight
Here's the practical part. PER is a great first filter when a game is on and you want to know who actually matters on the floor. Glance at the tiers before tip and you instantly know which role players are quietly producing and which big names are coasting on reputation.
It's an even better tell for bench players. A reserve carrying a PER in the low 20s is doing real damage in his minutes, even if his raw totals look small because he only plays 16 a night. Those are the guys whose numbers jump the second a starter sits. If you're trying to predict player stats before a game, a high-PER bench player who's one injury away from a bigger role is one of the smartest reads you can make.
Just remember the trap. A spike in production when a starter rests is about opportunity, not a permanent upgrade. The moment the rotation goes back to normal, the minutes shrink and so do the totals. Treat a one-night explosion as a product of the situation, not proof the player leveled up overnight. That's recency bias, and it wrecks more predictions than almost anything else.
So tonight, when PER flashes on screen, you'll actually know what it's telling you. Above 15 is above average. Twenty-five and up is a star. A crazy number on a guy who barely plays is noise. And a quiet high number on a bench player is a hint about who's about to matter. That's the whole point of advanced stats: not to memorize formulas, but to see the game a little sharper than the person next to you.
Common Questions
What is player efficiency rating (PER) in basketball?
Player efficiency rating, or PER, is a single number that sums up everything a player does in a game. It adds the good stuff like points, rebounds, assists, steals, blocks, and made threes, then subtracts the bad stuff like missed shots, turnovers, and fouls. The total is adjusted for minutes and pace, so one figure tells you how productive a player is per minute on the floor.
What is a good PER in the NBA?
League average PER is always 15, by design. Around 15 is a solid rotation player. Between 18 and 20 is a good starter. From 22 to 25 you're looking at a real All-Star. From 25 to 30 is superstar territory, and 30 or higher is an MVP-caliber season, which almost nobody reaches.
How is PER calculated?
PER was created by John Hollinger. It assigns a point value to every stat a player piles up, adds the positives, subtracts the negatives, then adjusts the result for the team's pace and for the player's minutes. The final number is scaled so the league average always lands at 15, which lets you compare players across teams and seasons. The full math is laid out on the Basketball-Reference PER page.
Does PER measure defense?
Barely. PER counts blocks and steals, but those two stats miss most of what good defense actually is. A player who shuts down the other team's best scorer without blocking a shot gets almost no credit. Hollinger himself has said PER is not a reliable measure of defense, so pair it with your eyes and with stats like plus-minus that try to capture the impact PER ignores.
PER won't tell you everything. It leans offensive, it gets fooled by small samples, and it shrugs at defense. But used right, it's one number that cuts through a box score and shows you who's actually producing out there. Combine it with a read on who's playing and you can see a stat line forming before tip-off. If you want to test those reads against other fans who care about the same details, GAGE is built for exactly that. One game. Same stats for everyone. No house. Just your knowledge against theirs.