Practical measurement guide
Screen Aspect Ratio Calculator
Use screen diagonal and aspect ratio to understand display width, height, and proportional screen shape.
Aspect ratio compares screen width to height and helps calculate display dimensions from a diagonal.
in
Common sizes
27-inch 16:9 display
Approximate visible panel dimensions, excluding the bezel and casing.
Width23.53 in59.77 cm
Height13.24 in33.62 cm
Diagonal27 in68.58 cm
27 in × 2.54 = 68.58 cm diagonal
Aspect ratio calculation
An aspect ratio such as 16:9 describes width compared with height. The diagonal and ratio form a right triangle used to estimate screen width and height.
Why aspect ratio matters
Two screens with the same diagonal can have different widths and heights if their aspect ratios are different.
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Frequently asked questions
What does 16:9 mean?
It means the screen width is 16 units for every 9 units of height.
Can the same diagonal have different widths?
Yes. Different aspect ratios produce different widths and heights.