Basketball efficiency calculators
Interactive, client-side calculators for the core NBA efficiency metrics. Type your own numbers and the formula, result, and a plain-English read update instantly. Pure math — nothing is fetched, nothing is fabricated.
True Shooting %
Roll twos, threes, and free throws into one efficiency number — points per scoring possession.
PTS / (2 × (FGA + 0.44 × FTA))Effective FG %
Field goal percentage that credits a three as worth 1.5 twos, because it is.
(FGM + 0.5 × 3PM) / FGANet Rating
A team's point margin per 100 possessions — the cleanest one-number team-quality read.
Offensive Rating − Defensive RatingPythagorean Win %
Turn points scored and allowed into an expected win percentage with Morey's NBA exponent.
PF^13.91 / (PF^13.91 + PA^13.91)Four Factors
Dean Oliver's four levers of winning basketball, weighted 40 / 25 / 20 / 15.
eFG% · TOV% · ORB% · FT RateShot-Value Explorer
Set attempt share and FG% by zone to see why the mid-range gets devalued. Flagship tool.
points per shot = point value × FG%True Shooting %: PTS / (2 × (FGA + 0.44 × FTA)). Enable JavaScript to use the interactive calculator.
Effective FG %: (FGM + 0.5 × 3PM) / FGA. Enable JavaScript to use the interactive calculator.
Net Rating: Offensive Rating − Defensive Rating. Enable JavaScript to use the interactive calculator.
Pythagorean Win %: PF^13.91 / (PF^13.91 + PA^13.91). Enable JavaScript to use the interactive calculator.
Four Factors: eFG% · TOV% · ORB% · FT Rate. Enable JavaScript to use the interactive calculator.
Shot-Value Explorer: points per shot = point value × FG%. Enable JavaScript to use the interactive calculator.
Want the theory behind each tool? Every calculator links to its full explainer. Start with True Shooting percentage or the Four Factors.