Screen Size Calculator
Enter a diagonal size and an aspect ratio to find a screen's physical width and height in inches and centimeters.
Physical size
Width: 47.94 in (121.8 cm)
Height: 26.96 in (68.5 cm)
How to use this calculator
Enter your values, read the result, and use the reset button to start again.
Formula
Width = Diagonal x (Ratio width / sqrt(Ratio width^2 + Ratio height^2)). Height follows the same pattern.
Frequently asked questions
Why is a 55 inch TV not 55 inches wide?
Screen sizes are measured diagonally. Width depends on the aspect ratio, so a 16:9 screen is always narrower than its diagonal.