Advanced Basketball Stats — What PER, True Shooting, and BPM Actually Measure

Why Box Scores Have Limits

Points, rebounds, and assists have told basketball stories for decades. But a player who scores 25 points on 30 shots might hurt their team more than help it. A big man who protects the rim and sets perfect screens might not register in any traditional column. That's why analysts, coaches, and front offices leaning into analytics rely on advanced metrics to fill the gaps.

Three stats appear most often in serious basketball conversation: Player Efficiency Rating (PER), True Shooting percentage (TS%), and Box Plus/Minus (BPM). Each captures something different, and understanding what they actually measure — and where they fall short — makes you a sharper consumer of basketball analysis.

PER: A Single-Number Summary of Productivity

Player Efficiency Rating was developed by analyst John Hollinger as an attempt to condense a player's per-minute statistical production into one number. It credits positive events — made shots, assists, rebounds, steals, blocks — and penalizes negative ones like turnovers and missed shots, weighted by their estimated value to a possession.

The formula is then normalized so that the league average always equals 15.0. A PER of 20+ typically signals an All-Star contributor; 25+ is historically elite territory.

What it captures well: Raw offensive productivity per minute. PER rewards volume contributors who also maintain efficiency.

Its blind spots: PER is heavily offense-weighted and largely ignores defensive impact. A strong perimeter defender who averages modest counting stats will often look unremarkable in PER despite genuine two-way value. Context matters too — PER can be inflated by playing alongside strong passers or on pace-heavy teams.

True Shooting %: The Real Cost of Every Made Basket

Field goal percentage treats a two-pointer and a three-pointer identically. True Shooting percentage fixes that by factoring in all three scoring methods — two-pointers, three-pointers, and free throws — weighted by how many possessions each actually costs a team.

The formula: TS% = Points ÷ (2 × True Shooting Attempts), where True Shooting Attempts = Field Goal Attempts + (0.44 × Free Throw Attempts). That 0.44 coefficient approximates the real possession cost of reaching the foul line.

A TS% of 57–58% is roughly league average in recent NBA seasons. Efficient scorers typically post 60%+. A player averaging big points on 52% TS% is actually below average in scoring value per possession — a critical distinction when evaluating shot creation.

TS% is one of the most actionable stats for fans: it quickly separates volume scorers from efficient ones. For more on how metrics like this reshaped athlete evaluation across professional sports, context matters.

BPM: Measuring Impact on Both Ends

Box Plus/Minus, maintained by Basketball-Reference.com, estimates how many points per 100 possessions a player contributes above (or below) league average, based on box score statistics and team context. It splits into Offensive BPM and Defensive BPM, then combines into a total BPM figure.

A BPM of 0.0 means average NBA contribution. Positive numbers are better — +5.0 is solidly All-Star level, while +8.0 is historically reserved for true MVP candidates. Negative BPM suggests a player is a net drag relative to a league-average replacement.

BPM is more holistic than PER because it attempts to account for defense, though it still relies on box score proxies (steals, blocks) rather than play-by-play data. For a deeper look at standings and how individual performance rolls up into team success, see what NBA conference standings actually mean.

Together, PER, TS%, and BPM give fans a richer, more honest picture of basketball performance than any single box score line ever could.