Monitor Size Calculator - Width, Height and Area from Diagonal
Calculate monitor width, height and screen area from diagonal size and aspect ratio.
Quick answer
A monitor size calculator estimates physical width, height and area from diagonal size and aspect ratio.
Method: ScreenTestKit generates the test surface in your browser. Results depend on visual inspection; the site does not read or diagnose physical panel hardware.
How to use this test
- Enter the diagonal display size in inches.
- Choose or enter the aspect ratio.
- Calculate estimated width, height and screen area.
- Compare sizes before buying or arranging a desk.
What to watch for
- Same diagonal size can feel different across aspect ratios.
- Ultrawide monitors are wider and often shorter than expected.
- TV and monitor stands add extra desk depth.
- Curved screens may need more placement planning.
How to interpret results
Wider ratio
More horizontal space, but not always more height.
Larger diagonal
More area, but it may require more viewing distance and desk depth.
Compare PPI
Size alone does not tell you sharpness; combine it with resolution.
Frequently asked questions
Does diagonal include the bezel?
Advertised screen size normally refers to the active panel, not outer bezel.
Does this work for TVs?
Yes, for estimating active width and height from diagonal and aspect ratio.