# Offensive & Defensive Efficiency

Let's start with **Offensive Efficiency**.

A team's offensive efficiency is the amount of points it scores per 100 offensive possessions.

`OE = (Points scored * 100) / Possessions`

**An Example**

In the 2016 NCAA Title Game, Villanova had 64.075 possessions and scored 77 points. Its offensive efficiency was **120**.

`OE = (77 * 100) / 64.075 = 120.171`

North Carolina scored 74 points over 64.175 possessions for an OE of **115**.

`OE = (74 * 100) / 64.175 = 115.30`

## Defensive Efficiency

A team's defensive efficiency is the amount of points it allows per 100 defensive possessions.

`DE = (Points allowed * 100) / Possessions`

**An Example**

Following our example above, Villanova's defensive efficiency is *115*. Villanova allowed 74 points over 64.175 possessions.

`DE = (74 * 100) / 64.175 = 115.30`

North Carolina's defensive efficiency is *120*. North Carolina allowed 77 points over 64.075 possessions.

`OE = (77 * 100) / 64.075 = 120.171`

Notice this is the *inverse*. An opponent's offensive efficiency equals a team's defensive efficiency. A team's offensive efficiency equals their opponent's defensive efficiency.

## Why are these numbers so high?

Remember this is the number of points scored or allowed per **100 possessions**. Offensive efficiency *isn't* an indication of how many points a team scores. Defensive efficiency *doesn't* suggest how many points a team allows.

The final score of the 2016 Title Game was 77-74. Not 120-115.

The average college basketball game features around 70 possessions. In our example above, the game featured about 64 possessions.

The Offensive Efficiency numbers are high because the statistic is over *100* possessions. Not 64 or 70.

*Don't confuse points-per-game with offensive or defensive efficiency.*

## Why was a team efficient on offense or defense?

A team's efficiency can be broken into four factors. Remember those factors?

- Shooting
- Offensive rebounding
- Avoiding turnovers
- Getting to the foul line

Let's continue with the 2016 Title Game as an example.

Villanova turned in an offensive efficiency of 120.

- eFG% = 67%
- OR% = 9%
- TO% = 16%
- FTRate = 35.4

Villanova made a high percentage of shots, avoided turnovers 84% of the time, and got to the foul line.

North Carolina posted an offensive efficiency of 115.

- eFG% = 52%
- OR% = 43%
- TO% = 17%
- FTRate = 20.6

While North Carolina rebounded a ton offensively, they trailed Villanova in the other 3 factors.

This a good reason why Villanova won the game. A higher offensive efficiency and a lower defensive efficiency than their opponent.