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# Screen size calculator

Computes screen width, height, area, pixel density, and seating distances from diagonal and aspect ratio, with a two-screen comparison.

Enter a diagonal to size it up.

The math is exact for the numbers you type, but real panels round: a 55 inch TV is often 54.6 inches of actual glass. PPI assumes the chosen resolution covers the whole panel, so a windowed or stretched picture changes it. The 30, 36 and 40 degree seating numbers are immersion guidance from SMPTE and THX practice, not eye-safety limits. Curved screens and projector throw are out of scope here.
Options

## More unit & math tools

- [Aspect ratio and DPI](/converters/aspect-ratio)
- [Unit converter](/converters/units)
[All unit & math tools](/converters)

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