Compare screen sizes, drawn to scale

Screen size is the diagonal of the visible picture, corner to corner, in inches — even in metric countries. The diagonal alone does not tell you how big a screen is: a 34″ 21:9 ultrawide is about as tall as a 27″ 16:9 monitor, just much wider. That is why this tool draws screens to scale from their diagonal and resolution.

Pixels per inch (PPI) is how densely pixels are packed: the diagonal in pixels divided by the diagonal in inches. At the same viewing distance, higher PPI means sharper text and images. A 27″ 1440p monitor has about 109 PPI, a 27″ 4K about 163 PPI, and recent phones 400–500 PPI because they are held much closer.

It is the viewing distance beyond which someone with 20/20 vision can no longer make out individual pixels — the point where one pixel covers one arcminute of vision. Apple calls screens that reach this at normal viewing distance “Retina”. Sitting closer than this distance you may notice pixels; farther away, extra resolution is hard to see.

Browsers do not know the physical size of your screen, so real-size mode asks you to calibrate once: either match a bank card on screen, or enter your screen’s diagonal. Displays are then drawn at their true physical size, so you can hold a phone or tablet up to the screen and compare. The calibration is stored only in your browser.

Catalog devices are modelled from the outer dimensions their makers publish — width, height and thickness, stand heights and screen curvature — so bezels, stands and depth are to scale. Details such as camera bumps, ports and exact stand shapes are simplified. Custom sizes and generic entries get typical bezels and stands, which the 3D view marks as estimated.

Catalog values come from manufacturers’ specifications. Marketed sizes are often rounded: many “24-inch” monitors are 23.8″, and TVs are sold by size class (a “65-inch class” panel can measure 64.5″). Every value can be edited, so you can enter the exact figures from a spec sheet.

Yes. The address bar always holds the current comparison, so you can bookmark it or use Share link to copy it. You can also download the drawing as an image. Nothing is stored on a server.