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Screen Size Calculator (Width, Height & Pixel Density)

Get the width, height, area, and pixel density of a display from its diagonal and aspect ratio. It supports 16:9, 16:10, 21:9, 4:3, 3:2, and custom aspects in inches or centimeters.

How to use
  1. Enter the screen diagonal.
  2. Pick the aspect ratio or set a custom one.
  3. Add the resolution for pixel density.
Preset
Physical dimensions
23.53 × 13.24 in

27 in diagonal · 16:9 aspect

Width
23.53 in
Height
13.24 in
Screen area
311.5 in²
Pixel density
108.8 PPI
Estimates for general information, verify important figures before relying on them.
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Worked examples

DiagonalAspectWidth x Height (in)
24 in16:920.9 x 11.8
27 in16:923.5 x 13.2
34 in21:931.4 x 13.5

Common questions

How do I find width and height from a diagonal?

Use the aspect ratio to split the diagonal: for 16:9 the width is the diagonal times 16 divided by the square root of 16 squared plus 9 squared.

What is pixel density (PPI)?

PPI is pixels per inch, found by dividing the diagonal pixel count by the screen's diagonal in inches. Higher PPI looks sharper.

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