Enter the resolution width, resolution height, and diagonal size of a display to determine the pixel size. The calculator will provide the pixel size in millimeters.

Pixel Size Formula

The following formula is used to calculate the pixel size of a display. 

PS = (DS / DR) * 25.4

Variables:

  • PS is the pixel size (millimeters)
  • DS is the diagonal size of the display (inches)
  • DR is the diagonal resolution of the display (pixels)
  • 25.4 is the conversion factor from inches to millimeters

To calculate the pixel size, divide the diagonal size of the display by the diagonal resolution and then convert the result from inches to millimeters by multiplying by 25.4.

What is Pixel Size?

Pixel size refers to the physical size of an individual pixel on a display. It is a measure of how large each pixel is, which affects the overall sharpness and clarity of the image on the screen. Smaller pixels typically result in a higher resolution and a clearer image, as there are more pixels packed into the same area. Knowing the pixel size can be important for graphic designers, photographers, and anyone interested in the quality of a display.

How to Calculate Pixel Size?

The following steps outline how to calculate the Pixel Size.

  1. First, determine the resolution width (W) and resolution height (H) of the display in pixels.
  2. Next, determine the diagonal size (DS) of the display in inches.
  3. Calculate the diagonal resolution (DR) using the formula: DR = √(W² + H²).
  4. Use the pixel size formula: PS = (DS / DR) * 25.4.
  5. Finally, calculate the Pixel Size (PS) in millimeters.
  6. 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.

Resolution Width (W) = 1920 pixels

Resolution Height (H) = 1080 pixels

Diagonal Size (DS) = 24 inches