Why diagonal inches can fool you
Screens are sold by their diagonal — 55", 65", 27" — but that single number hides how much actual viewing surface you get. Area grows with the square of the size, so a 65" TV isn't 18% bigger than a 55" one as the numbers suggest; it's about 40% bigger by area. This tool converts each diagonal into real width, height and surface area so you compare what actually matters: how much screen you're looking at.
Aspect ratio changes everything
Two screens with the same diagonal can be very different sizes. An ultrawide 21:9 monitor and a standard 16:9 monitor of the same diagonal have different areas, because the diagonal is split between width and height differently. That's why the tool asks for each screen's aspect ratio: 16:9 for most TVs and monitors, 21:9 for ultrawides, 4:3 for older displays, or the tall ratios phones use. Getting this right is essential for a fair comparison.
Great for buying a TV or monitor
Use it to decide whether the jump from a 55" to a 65" is worth it, to compare an ultrawide against a regular monitor, or to check how much bigger a new phone's screen really is. The scaled drawing makes the difference obvious at a glance — often far larger, or smaller, than the headline inch numbers make it feel.
Frequently asked questions
How is screen area calculated?
From the diagonal and aspect ratio: the diagonal is split into width and height using the ratio, then width × height gives the area, converted to cm² and in².
Why isn't a 65-inch twice a 33-inch?
Because area scales with the square of the size. Doubling the diagonal roughly quadruples the area, so inch numbers understate how big a difference really is.