Practical measurement guide
Screen Size vs Width and Height
Learn why screen size is measured diagonally and how aspect ratio affects display width and height.
Screen size is the diagonal measurement; width and height depend on aspect ratio.
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
Aspect ratio changes the dimensions
Screen size is measured diagonally. Two screens with the same diagonal can have different widths and heights if their aspect ratios differ.
Use the right tool
Use the screen size converter when you need estimated width and height, not just diagonal centimeters.
Related measurement tools
Frequently asked questions
Is screen size measured diagonally?
Yes. Screen size is normally the diagonal measurement.
Can two screens with the same diagonal have different dimensions?
Yes. Different aspect ratios produce different widths and heights.