TV Size Calculator

Find a screen's width and height from its diagonal.

Diagonal

Aspect ratio

Width 47.937

Height 26.964

Formula: from diagonal and aspect ratio (Pythagoras)

Step-by-step with your numbers:

1. Values used:

2. Diagonal = 55

3. Aspect ratio = 1.778

5. Width = 47.937

6. Height = 26.964

Did we solve your problem today?

TVs are sold by diagonal — find the actual width and height.

The math behind it

With aspect ratio r = width/height: height = diagonal ÷ √(r²+1); width = height × r.

55" 16:9 → 47.9" × 27.0".

Wall fit?

Use the width and height (not the diagonal) for clearance.