Screen Size Calculator

Pick an aspect ratio, then enter the one screen dimension you know (diagonal, width or height) in centimetres or inches. The other dimensions, the screen area and recommended viewing distances are calculated instantly.

1Aspect Ratio

Predefined format

Aspect ratio (width : height)

Resolution – horizontal pixels (optional, for pixel pitch)

Resolution – vertical pixels

2Screen Dimensions

Enter the measurement you know. The highlighted field drives the calculation; the other fields update automatically.

Centimetres

Inches

Diagonal

Width

Height

Results

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Screen Area (m²)

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Screen Area (sq ft)

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Aspect Ratio (decimal)

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Pixel Pitch (mm)

–

Pixel Density (PPI)

Viewing Distance

Rule-of-thumb guidance based on image height, as used in the AVIXA DISCAS standard. Left: the farthest viewer this screen supports. Right: the screen you need for a given room depth.

Viewing task	Farthest viewer
Analytical decision makingDetailed inspection, CAD, spreadsheets · 4 × height	–
Basic decision makingPresentations, documents, UC · 6 × height	–
Passive viewingVideo, digital signage · 8 × height	–

Farthest viewer distance (m)

Required screen	Height / Diagonal
Analyticalheight = distance / 4	–
Basicheight = distance / 6	–
Passiveheight = distance / 8	–

These simplified 4H / 6H / 8H ratios are widely used for early-stage design. The full DISCAS method also considers content element size and viewer acuity; verify critical projects against the standard.