TV size viewing distance calculator

Calculate the viewing distance that makes a flat screen fill your chosen horizontal field of view.

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Screen diagonal (inches)

Chosen horizontal field of view (degrees)

More inputs and assumptions

Aspect-ratio width

Aspect-ratio height

Answer

…

Calculate the viewing distance that makes a flat screen fill your chosen horizontal field of view.

More results

Precision and calculation record

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Formula and assumptions

Screen width is diagonal times aspect width divided by the aspect diagonal. Distance is width divided by twice the tangent of half the selected angle. The example 40-degree angle is an input, not a viewing recommendation. This does not model eyesight, pixel visibility, curved screens, seating comfort or an installation standard.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-29

Using TV size viewing distance calculator

Calculate the viewing distance that makes a flat screen fill your chosen horizontal field of view.

Next: Display viewing angle calculator

Next: Display size calculator

A worked example

For screen diagonal (inches) = 55, chosen horizontal field of view (degrees) = 40, aspect-ratio width = 16, aspect-ratio height = 9, viewing distance (inches) = 65.852438.

Before you use the result

Example results for screen diagonal (inches)

These examples use Chosen horizontal field of view (degrees): 40; Aspect-ratio width: 16; Aspect-ratio height: 9. They are reference calculations, not recommended settings.

Screen diagonal (inches)	Viewing distance (inches)
27.5	32.926219
55	65.852438
110	131.704876

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