Screen Size Calculator — Compare Screens & Picture Sizes
Find screen width and height from its diagonal, compare two screens at the same scale and see how much space a movie or image actually uses.
DISPLAYS · SIZE YOU CAN SEE
What size is the picture, really?
Turn a screen diagonal into width and height. Compare two screens, then see how much space your video actually uses.
Screen A
Screen B
Image on the screen
27 in diagonal · 16:9 shape
Drawing uses one physical scale for both screens; it is not actual size on your device. Dark areas are unused space around the image.
Screen A
- Visible screen
- 23.53 × 13.24 in
- Screen area
- 311.5 in²
- 16:9 image
- 23.53 × 13.24 in
- Image diagonal
- 27 in
- Image uses
- 100% of screen area
Flat rectangular active display only. Bezels, stands and curved-screen footprints are excluded. Check the manufacturer's outer dimensions before checking furniture fit.
Largest visible screen inside a measured rectangle
This is an active-display geometric limit, not a TV or monitor purchase fit check. Allow separately for the actual bezel, stand, cables and ventilation.
How dimensions, image fit and comparison work
A screen’s diagonal is measured across its visible display. For diagonal d and width:height ratio a:b, width = d × a / √(a² + b²), height = d × b / √(a² + b²). Area is width × height. At the same shape, changing 55 to 65 inches increases area by (65/55)² − 1 = 39.67%, not just the diagonal’s 18.18%.
The image is scaled uniformly until either its width or its height reaches the screen edge. All content remains visible. A wider movie produces top and bottom bars; narrower content produces side bars. Each bar size shown is for one side. The tool does not detect black bars already encoded in a video or predict a device’s zoom and overscan settings.
Ratio labels can be approximate. Use measured active width:height when accuracy matters. The 43:18 example is the ratio 3440:1440, assuming square pixels; it is not a measurement of every “21:9” monitor. Curved monitors need manufacturer dimensions; this flat model does not calculate their straight-line footprint.
Inches and centimetres use 1 in = 2.54 cm. Screen and image area comparisons are geometric; they do not predict brightness, resolution, usable desktop workspace, viewing comfort or which display to buy.
Sony explains aspect ratios, black bars and the effects of zooming or stretching. The geometry above is derived independently.
