Enter the average fiber count per graticule field, the mean field blank count per graticule field, and the graticule field area (mm^2) into the Fibre Density Calculator. The calculator will evaluate the Fibre Density.

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## Fiber Density Formula

The following formula is used to calculate the Fiber Density.

E = (AF - MFB) / A

Variables:

- E is the Fiber Density (fibers/mm^2)
- AF is the average fiber count per graticule field
- MFB is the mean field blank count per graticule field
- A is the graticule field area (mm^2)

To calculate the fiber density, subtract the mean field blank count per graticule field from the average fiber count per field, then divide by the field area.

## How to Calculate Fiber Density?

The following steps outline how to calculate the Fiber Density.

- First, determine the average fiber count per graticule field.
- Next, determine the mean field blank count per graticule field.
- Next, determine the graticule field area (mm^2).
- Next, gather the formula from above = E = (AF – MFB) / A.
- Finally, calculate the Fibre Density.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

average fiber count per graticule field = 50

mean field blank count per graticule field = 20

graticule field area (mm^2) = 3

E = (AF – MFB) / A =** ** ?