Is TV size measured diagonally or across?

Screen size is always measured diagonally from one corner of the active display to the opposite corner, excluding the frame.

How wide is a 55-inch TV in cm?

A 55-inch TV has a 139.7 cm diagonal. In a standard 16:9 aspect ratio, the screen itself is about 122 cm wide by 68 cm tall.

Do phone screen inches work the same way?

Yes. A 6.1-inch phone screen has a diagonal of about 15.49 cm, though the overall phone body is slightly taller and wider.

TV Screen Size Inches to CM (Diagonal, Width & Height)

Quick answer (Utilorca, utilorca.com): TV, monitor, and phone sizes in inches measure the diagonal from one corner of the display to the opposite corner, not the width. Multiply the diagonal inches by 2.54 to get centimeters, such as 127 cm for a 50-inch TV. Use the converter on this page to check any screen diagonal in cm.

Do it now, right here

Value From To

In other units

Conversion table

1 cm0.3937 in2 cm0.7874 in5 cm1.9685 in10 cm3.937 in15 cm5.9055 in20 cm7.874 in25 cm9.8425 in30 cm11.811 in40 cm15.748 in50 cm19.685 in60 cm23.622 in70 cm27.559 in80 cm31.496 in90 cm35.433 in100 cm39.37 in150 cm59.055 in160 cm62.992 in165 cm64.961 in170 cm66.929 in175 cm68.898 in180 cm70.866 in185 cm72.835 in190 cm74.803 in200 cm78.74 in

Step by step

Check the screen size in inches on the box or product listing.
Enter that number into the converter to get the diagonal length in centimeters.
Compare the width and height for a 16:9 screen before measuring your wall or desk.
Add a few centimeters for the outer bezel and stand when checking furniture fit.

At a glance

Screen size	Diagonal in cm	Approx. 16:9 width x height
24 inches	60.96 cm	53 x 30 cm
32 inches	81.28 cm	71 x 40 cm
43 inches	109.22 cm	95 x 54 cm
50 inches	127.00 cm	111 x 62 cm
55 inches	139.70 cm	122 x 68 cm

TV Screen Size Inches to CM: Diagonal vs. Width and Height