Measure the screen diagonally How are TVs measured, anyway? When you see the touted size spec on a TV’s tag or in one of our write-ups, that size is always referring to the diagonal measurement ...

However, since this measurement only refers to the diagonal screen size, it won't tell you the TV's actual height, width, or depth. Thankfully, these dimensions are also easy to measure.

Tech SIZE MATTERS How to measure a TV screen: From viewing distance to sizes, a step-by-step guide Matt Breen Published: 17:04, 25 Jun 2025 Updated: 15:01, 27 Jun 2025 ...

The first thing to know is that when you see a TV’s size listed, that it refers to the diagonal length of the screen - lots of people make the mistake of assuming it refers to the screen’s width.

This wouldn’t be the first time we’ve seen a change in the base model’s diagonal screen size as the S24 delivered a 6.2-inch display versus the S23’s 6.1-inch size.

When folded, a 20-inch diagonal screen would have a 15.3-inch diagonal size. Which is comparable to the larger iPad Pro or 16-inch MacBook Pro.