Tools

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) / FGA

Net Rating

A team's point margin per 100 possessions — the cleanest one-number team-quality read.

Offensive Rating − Defensive Rating

Pythagorean 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 Rate

Shot-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.