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.

(HDTV screens are always measured in the diagonal.) In fact, if you see the word "class" mentioned in reference to screen size on a TV ad, the seller may be trying to obscure a true, smaller size.

1. Choose the Right Screen Size for your Room Your seating distance will determine your sense of picture clarity and detail as well as the quality of the viewing experience. If all you watch are true ...

Crutchfield recommends a distance of 1 to 1.5 times diagonal screen size for 4K TVs and 1.5 to 2.5 for 1080p sets.

Monitors and TVs advertise their size using the diagonal screen measurement, and everyone is pretty used to how much space a 16:9 aspect ratio screen takes up.

The HP Pavilion Gaming 16 offers, yes, 16 inches of diagonal screen size in nearly the same body as a typical 15-inch laptop. The starting price on this gaming laptop is $800.