You are watching a playoff game and the broadcaster says it. Doris Burke, mid-sentence, drops "this team is plus-8.4 in net rating this series" like everyone in the room knows exactly what that means. Half the audience nods. Most of them have no idea. I was one of those people for years. I knew it was good to be a high number and bad to be a low one, and that was about it.
So let us fix that. By the end of this you will know what net rating is, why analysts trust it, and where it falls apart.
What net rating actually is
Net rating is built from two simpler numbers.
Offensive rating is how many points a team scores per 100 possessions. Defensive rating is how many points it allows per 100 possessions. Net rating is just the first one minus the second.
Score 115 per 100, allow 107 per 100, and your net rating is plus-8. That is it. That is the whole formula.
The piece people skip is the word "possession." A possession is one trip with the ball. It ends when you score, when you miss and the other team grabs the rebound, or when you turn it over. Someone brings the ball up, the team swings it around, someone misses a three, the other team rebounds. One possession, zero points. Next trip, a layup goes in. One possession, two points. Add up every trip in a game and you have got the team total possessions.
Why per-100 matters
Here is the part that makes net rating useful instead of just another stat.
Teams play at different speeds. A fast team pushes the ball, takes quick shots, and racks up 105 possessions a night. A slow, grind-it-out team might only get 95. The fast team is going to score more raw points almost no matter what, because it simply gets more chances. That does not make it better. It makes it busier.
Per-100 strips that out. It puts every team on the same number of trips so you are comparing efficiency, not volume. A team scoring 110 points on 105 possessions is less efficient than a team scoring 108 on 95. Raw scoring hides that. Net rating shows it.
This is also why net rating beats plain point differential for anyone trying to predict what happens next. Point differential gets inflated by pace. Net rating does not. If you want the same logic applied to a single player, our breakdown of why points per game is a bad stat covers the volume-versus-efficiency trap one level down.
What net rating tells you
Net rating is a big-picture number. Treat it that way.
It is a team stat, not a player stat. You cannot look at one guy and say "he is plus-8" the way you would quote his points per game. Lineup data exists, but the clean version of this number lives at the team level. If you want the player-level cousin of this idea, read our explainer on plus-minus in basketball.
It also needs a real sample. Twenty games minimum before I would trust it, and a full season is better. Over a long stretch, net rating is one of the most honest descriptions of how good a team actually is. It tells you whether a team structure holds up, on both ends, against everybody.
When a team sits at plus-9 over 70 games, that is not noise. That is a real strength you can point to. For the full list of where it sits on a box score, the NBA.com stats glossary defines offensive, defensive, and net rating side by side.
What net rating does not tell you
Now the limits, because this is where people get burned.
Net rating is a rearview mirror. It tells you what already happened. It says nothing about the injury that just changed the rotation or the matchup waiting next round.
It does not account for specific matchups either. A team can have a great net rating built on bullying small lineups, then run into a team with size and watch the whole thing wobble.
And a seven-game sample? The error bars are enormous. A single hot shooting night can swing a short series net rating by a wide margin. So when that broadcaster quotes "plus-8.4 this series," remember it is four or five games. That is barely enough to mean anything. This is the same trap we cover in regression to the mean in the NBA: small samples lie, and they lie loudest in the playoffs.
How to use it when you are making a prediction
Here is how I actually use it. Net rating is a question machine, not an answer machine.
Say a team is plus-10 but they are shooting 45 percent from three. That is a flashing light. Nobody keeps that up. The net rating is real, but it is borrowed against shooting that is going to cool off. So I dig in. Is the defense carrying it, or is the whole thing propped up by hot nights?
Flip it. A team sitting at plus-3 while shooting poorly from outside might be better than the number looks, because the shooting should bounce back.
Use net rating to figure out which team approach is more sustainable. Then go check what is underneath it. It frames the matchup. It does not decide it. If you are turning that read into an actual call on a player, our guide on how to predict player stats walks through the next steps.
Common Questions
What is a good net rating in the NBA?
Anything above plus-5 over a full season is strong. The best teams in a given year usually land somewhere between plus-7 and plus-10. Title contenders almost always live in that top tier.
Is net rating better than point differential?
For comparing teams, yes. Point differential gets skewed by pace, so a fast team looks better than it is. Net rating normalizes for possessions, so it is the cleaner read.
Can a team have a good record but a bad net rating?
Absolutely. A team that wins a pile of close games while getting blown out in losses can have a winning record and a mediocre net rating. That gap usually means the record is a little lucky and tends to slide back.
How many games do you need before net rating means something?
At least 20, and ideally a full season. Anything shorter, especially a single playoff series, carries huge error bars and can mislead you.
Net rating is a tool in the toolbox. It is a good one. It tells you who has been efficient and on which end. But it is a starting point, not a verdict. The skill in predicting basketball is not memorizing the number. It is knowing what questions to ask once you have seen it. Net rating gets you to the right questions faster. The rest is on you. If you want to test those reads against other fans, GAGE is built for exactly that. One game. Same stats for everyone. No house. Just your knowledge against theirs.