📊 PER (Player Efficiency Rating) Calculator
Enter a full box-score line to get Hollinger's Game Score and an estimated PER proxy — a fast read on how efficient a single performance really was.
📊 Efficiency
Estimated PER is an approximation anchored so an average per-minute line ≈ 15.0. True PER is pace-adjusted and league-normalized — see the FAQ below.
One number for a whole box score
A stat line has a dozen columns; Game Score collapses them into one figure so you can compare games at a glance. It credits efficient scoring, rebounding, and playmaking while docking missed shots, fouls, and turnovers — a quick, honest summary of impact.
Remember the ceiling on the estimate: official PER is normalized across the entire league. Read the estimated value as a same-scale approximation, and lean on Game Score for comparing individual nights.
❓ Frequently Asked Questions
Is this the real Player Efficiency Rating?
Not exactly. True PER, created by John Hollinger, is pace-adjusted and league-normalized so that the league average is always exactly 15.0 — computing it requires leaguewide totals for a full season, which a single box score doesn't provide. This calculator gives a widely used approximation, not the official figure.
What is Game Score?
Game Score is Hollinger's single-game rating, built to roughly track points: 10 is an average game, 40 is outstanding. The formula is PTS + 0.4·FGM − 0.7·FGA − 0.4·(FTA−FTM) + 0.7·ORB + 0.3·DRB + STL + 0.7·AST + 0.7·BLK − 0.4·PF − TOV. It rewards scoring efficiency and all-around production while penalizing missed shots, fouls, and turnovers.
How is the estimated PER computed here?
We scale your per-minute Game Score so that an average-productivity minute (about 0.4 Game Score per minute) maps to the 15.0 league-average anchor. It's a transparent proxy meant to put a single game on a familiar scale — it will differ from a player's official season PER.
What counts as a good PER?
On the official scale: 15 is league average, 20+ is an All-Star level season, 25+ is an MVP candidate, and 30+ is historically great. Because our number is a single-game proxy, expect it to swing much more game to game than a season-long PER.