Question 1

How is TV size measured?

Accepted Answer

TV size refers to the diagonal length of the screen measured in inches, from the top-left corner to the bottom-right corner. The actual width and height depend on the aspect ratio (16:9 for modern TVs).

Question 2

What is the ideal viewing distance for my TV?

Accepted Answer

A common rule of thumb is 1.5-2.5x the screen diagonal for HD content, and 1-1.5x for 4K. For example, a 55-inch 4K TV has a comfortable viewing distance of 55-83 inches (4.6-6.9 ft).

Question 3

What is PPI and why does it matter?

Accepted Answer

PPI (pixels per inch) measures pixel density. A higher PPI means a sharper image. 4K TVs at typical viewing distances have ~80-100 PPI which exceeds the human eye's resolving power at those distances.

Question 4

Can I use this for monitor sizing?

Accepted Answer

Yes. The calculator works for any screen. Just pick the matching aspect ratio — most monitors are 16:9, ultrawides are 21:9, and older 4:3 displays can also be calculated.

Width

Height

PPI (Pixel Density)

Screen Area