Efficiencycalculator.
The NBA efficiency rating, computed from a stat sheet you can actually keep. Unlike PER, every input it needs fits on one line of a scorebook — which is why it is the one we recommend to youth coaches.
Result
Enter at least one shot attempt to get a result.
Nothing leaves your device
The maths runs in your browser. The numbers you type are never sent to a server and never stored. There is nothing to accept, and nothing to delete afterwards.
What the calculator asks for
The inputs are the columns of our stat sheet, one for one. If you use it, you copy across without converting anything.
| Input | Where to find it |
|---|---|
| Free throws made | FT + column |
| Free throws missed | FT – column |
| Two-point field goals made | 2PT + column |
| Two-point field goals missed | 2PT – column |
| Three-pointers made | 3PT + column |
| Three-pointers missed | 3PT – column |
| Offensive rebounds | ORB column |
| Defensive rebounds | DRB column |
| Assists | AST column |
| Steals | STL column |
| Blocks | BLK column |
| Turnovers | TO column |
| Games played | count them yourself |
The formula
EFF = (PTS + REB + AST + STL + BLK − Missed FG − Missed FT − TO) ÷ Games played
Everything a player contributes is added, everything they cost is subtracted, and the total is divided by games played. That last division is what makes it comparable between a starter and a bench player — something the raw box score never is.
The NBA's efficiency rating, as published in its official statistics.
A worked example
Take a fictional wing over one game: 3 free throws made of 4, 5 two-point field goals of 11, 1 three of 4, 3 offensive rebounds, 5 defensive, 4 assists, 2 steals, 1 block, 3 turnovers.
- Points: 3 free throws + (5 × 2) + (1 × 3) = 16
- Positives: 16 points + 8 rebounds + 4 assists + 2 steals + 1 block = 31
- Negatives: 9 missed field goals + 1 missed free throw + 3 turnovers = 13
- EFF over one game: (31 − 13) ÷ 1 = 18
EFF: 18.0. Note that fouls do not appear anywhere — that is the main thing separating EFF from the European PIR.
What a good efficiency looks like
NBA benchmarks do not transfer. A 25 EFF is an All-Star season in the NBA, over 36 minutes a night. In rec and travel basketball, with shorter games and wider rotations, the scale sits lower.
| EFF per game, amateur | What it tells you |
|---|---|
| Negative | The player cost more than they returned that night. Common, and not alarming over one game. |
| 0 to 5 | A quiet contribution, or short minutes. |
| 6 to 12 | A full game on a normal rotation. |
| 13 to 20 | The player carried the team. |
| Above 20 | Rare at this level. Check the sheet before celebrating. |
What efficiency does not tell you
It puts everything on one scale. A defensive rebound is worth one point, an assist is worth one point, a turnover costs one. No coach would sign that equivalence if you put it to them in those words.
It ignores fouls entirely — both drawn and committed. A player who fouls out in twelve minutes and one who never fouls are treated identically.
It punishes the player who takes the hard shots. Whoever the team asks to create late in the clock will miss more, and their efficiency drops for doing the job.
It rewards volume. Over a youth season it mostly identifies who has the ball, which is information — but not the information most people think they are reading.
And it says nothing about defence that does not show up in the box score: positioning, help, deterring a shot. A rim protector who never blocks is invisible here.
Twelve players, fifteen fields
One player, one game,then do it again.
You just copied a line of numbers by hand to get one figure. There are twelve players on the roster and a game every week. PlayerTrackr logs it once, during the game, and keeps these numbers current on its own — for every player, from one game to the next.
