Practical measurement guide
4:3 Screen Size Calculator
Estimate width and height for a 4:3 display from its diagonal size.
4:3 Screen Size Calculator estimates display dimensions from user-entered screen measurements; it does not rely on branded product specs.
in
Common sizes
15.6-inch 16:9 display
Approximate visible panel dimensions, excluding the bezel and casing.
Width13.6 in34.54 cm
Height7.65 in19.43 cm
Diagonal15.6 in39.624 cm
15.6 in × 2.54 = 39.624 cm diagonal
What this screen calculator does
This calculator uses the screen diagonal and aspect ratio entered by the user. It does not use branded specifications or invented device dimensions.
Example result
A 27-inch display in the selected ratio is approximately 10.97 inches wide and 24.67 inches tall, before bezels or casing.
Screen measurement formula
Screen size is diagonal. Width and height are calculated from the diagonal and the width-to-height ratio using right-triangle geometry.
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Frequently asked questions
Does the result include the bezel?
No. The calculation estimates the visible display area, not the frame, casing, stand, or mount.
Is screen size measured diagonally?
Yes. Advertised screen size is normally the diagonal measurement.
Can two screens with the same diagonal have different widths?
Yes. Different aspect ratios produce different width and height values.