Enter the pixel size (um) and the focal length (mm) into the Calculator. The calculator will evaluate the Arc Seconds Per Pixel.

## Arc Seconds Per Pixel Formula

ASPP = (PS/FL) * 206.265

Variables:

- ASPP is the Arc Seconds Per Pixel (arc-sec/pixel)
- PS is the pixel size (um)
- FL is the focal length (mm)

To calculate Arc Seconds Per Pixel, divide the pixel size by the focal length, then multiply by 206.265.

## How to Calculate Arc Seconds Per Pixel?

The following steps outline how to calculate the Arc Seconds Per Pixel.

- First, determine the pixel size (um).
- Next, determine the focal length (mm).
- Next, gather the formula from above = ASPP = (PS/FL) * 206.265.
- Finally, calculate the Arc Seconds Per Pixel.
- 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.

pixel size (um) = 75

focal length (mm) = 90