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Offensive Rating Calculator
Calculates NBA Offensive Rating (points scored per 100 possessions) for a team or individual player using Dean Oliver's formula.
Calculator
Formula
ORtg = Points Scored divided by Possessions, multiplied by 100. Possessions can be estimated as: FGA - OREB + TO + (0.44 × FTA), where FGA = field goal attempts, OREB = offensive rebounds, TO = turnovers, FTA = free throw attempts. The 0.44 factor accounts for the-and-one and technical free throw situations.
Source: Dean Oliver, 'Basketball on Paper', 2004. Possession estimate formula widely used by Basketball-Reference.com.
How it works
Offensive Rating is defined as Points Scored ÷ Possessions × 100. Because teams with faster pace naturally accumulate more points in absolute terms, dividing by possessions normalizes for pace and enables fair comparisons across eras, teams, and individual players.
When raw possession counts are unavailable, possessions are estimated from box-score data using the widely-accepted formula: Possessions ≈ FGA − OREB + TO + (0.44 × FTA). The coefficient 0.44 reflects that not every free-throw attempt consumes a full possession — and-ones and technical fouls produce only a single shot out of a multi-shot sequence.
ORtg is used in player evaluation (individual ORtg via Dean Oliver's more complex allocation), game-by-game team scouting, season-long leaderboard comparisons, and salary arbitration analytics. NBA teams that consistently post ORtg values above 115 typically rank among the league's top offensive units.
Worked example
Suppose a team scores 110 points with 85 FGA, 10 OREB, 13 turnovers, and 22 FTA.
Step 1 — Estimate Possessions:
Possessions = 85 − 10 + 13 + (0.44 × 22) = 85 − 10 + 13 + 9.68 = 97.68
Step 2 — Calculate ORtg:
ORtg = (110 ÷ 97.68) × 100 = 112.6 pts per 100 possessions
An ORtg of 112.6 falls in the Average tier and is competitive at the NBA team level, where league-average ORtg typically hovers between 108 and 114 in the modern era.
Limitations & notes
The possession estimation formula is an approximation. Actual possession counts (available in play-by-play data) will differ slightly because the 0.44 FTA multiplier is an empirical average that varies by team free-throw strategy and era. For highly accurate individual player ORtg, Dean Oliver's full allocation model — which distributes team possessions among players using floor percentage and scoring possessions — should be used instead. Additionally, this calculator does not account for intentional fouling, technical free throws, or flagrant-foul sequences, all of which can slightly inflate or deflate the possession estimate. Finally, a single-game ORtg is subject to high variance; multi-game or season-level data provides a more reliable signal.
Frequently asked questions
What is a good Offensive Rating in the NBA?
In modern NBA play (2015–present), a team ORtg above 115 is considered elite, 110–115 is above average, 106–110 is around league average, and below 106 is below average. For individual players with significant minutes, an ORtg above 115 is excellent. These benchmarks shift slightly across eras as overall league pace and scoring efficiency evolve.
What is the difference between Offensive Rating and True Shooting Percentage?
True Shooting Percentage (TS%) measures shooting efficiency only — points per shooting opportunity including free throws. Offensive Rating is a broader metric that also penalizes turnovers and rewards offensive rebounding, making it a more complete measure of offensive value. A team can have a high TS% but a poor ORtg if they turn the ball over frequently.
Why is the free throw attempts coefficient 0.44 and not 0.5?
Not all free throw attempts occur in two-shot or three-shot sequences. And-ones (one free throw after a made basket), technical free throws, and flagrant-foul first shots all produce a single free throw within a larger possession or play. Empirical analysis across many NBA seasons by Dean Oliver found that approximately 44% of free throw attempts represent a 'new' possession, hence the 0.44 multiplier.
Can I use this calculator for college basketball or other leagues?
Yes, the formula is league-agnostic. However, the 0.44 free throw coefficient was calibrated on NBA data. College basketball analysts sometimes use 0.475 to account for different fouling patterns. The efficiency grade benchmarks in this calculator are also NBA-specific; college ORtg values typically run 5–10 points lower on average due to pace differences.
How is individual player Offensive Rating different from team Offensive Rating?
Team ORtg is straightforward: team points divided by team possessions times 100. Individual player ORtg (as defined by Dean Oliver and implemented on Basketball-Reference) is more complex — it requires estimating the number of offensive possessions a player uses (via floor percentage) and how many points those possessions produce (via scoring possessions). The result is that individual ORtg weights a player's personal contributions, not just the team's performance while they are on the court.
How does pace affect Offensive Rating?
Pace measures possessions per 48 minutes. A fast-paced team might score 120 points in a game, but if they used 110 possessions to do it, their ORtg is only about 109. A slower team scoring 105 points on 90 possessions has an ORtg of about 117 — far more efficient. This is precisely why per-possession metrics like ORtg are more informative than raw scoring totals when evaluating offensive quality.
Last updated: 2025-01-30 · Formula verified against primary sources.