TV size and viewing distance
Real width and height of a screen in inches, and the right distance to watch it from.
How it works
Width = diagonal × w / √(w² + h²). Recommended distance (30 to 40° viewing angle): about 1 to 1.6 × the diagonal in 4K, 1.6 to 2.5 × in Full HD.
Results are for guidance only and do not replace professional advice.
Worked example
With the default values:
- Diagonal (inches)55
- Aspect ratio16:9 (TV, monitor)
- Resolution4K (2160p)
you get:
- Ideal distance1.4 – 2.2 m
- Screen width121.8 cm
- Screen height68.5 cm
- Diagonal139.7 cm
Frequently asked questions
How does the “TV size and viewing distance” tool work?
Width = diagonal × w / √(w² + h²). Recommended distance (30 to 40° viewing angle): about 1 to 1.6 × the diagonal in 4K, 1.6 to 2.5 × in Full HD.
What do I need to enter?
Just fill in: diagonal, aspect ratio, resolution. The result updates as you type.
Can you give an example?
Diagonal (inches): 55; Aspect ratio: 16:9 (TV, monitor); Resolution: 4K (2160p) → Ideal distance: 1.4 – 2.2 m; Screen width: 121.8 cm.
Is this calculator free, and is my data private?
Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.