The image above represents planar density.

To compute for planar density, two essential parameters are needed and these parameters are **Number of Atoms Centered on the Plane (N) **and **Area of the Plane (A).**

The formula for calculating planar density:

PD = ^{N}/_{A}

Where:

PD = Planar Density

N = Number of Atoms Centered on the Plane

A = Area of the Plane

Given an example;

Find the planar density when the number of atoms centered on the plane is 24 and the area of the plane is 3.

This implies that;

N = Number of Atoms Centered on the Plane = 24

A = Area of the Plane = 3

PD = ^{N}/_{A}

PD = ^{24}/_{3}

PD = 8

Therefore, the **planar density **is **8 atoms/m².**