Enter the number of grating lines and the total length (mm) into the Grating Density Calculator. The calculator will evaluate and display the Grating Density.

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## Grating Density Formula

The following formula is used to calculate the Grating Density.

**GD = GL / L**

- Where GD is the Grating Density (lines/mm)
- GL is the number of grating lines
- L is the total length (mm)

## How to Calculate Grating Density?

The following example problems outline how to calculate Grating Density.

Example Problem #1:

- First, determine the number of grating lines.
- The number of grating lines is given as: 100.

- Next, determine the total length (mm).
- The total length (mm) is provided as: 25.

- Finally, calculate the Grating Density using the equation above:

GD = GL / L

The values given above are inserted into the equation below:

GD = 100 / 25 = 4 (lines/mm)

Example Problem #2:** **

For this problem, the variables needed are provided below:

number of grating lines = 85

total length (mm) = 93

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer.

GD = GL / L** = ?**