TV Size & Viewing Distance Calculator
TV size calculator: screen width and height from the diagonal, the best TV size for your viewing distance and the ideal distance for a given TV.
4K: diagonal ≈ distance × 0.84 (THX 40°)
How to use this calculator
- Type your input in the box.
- The result updates as you type.
- Use “Copy result” or “Copy link” to share it.
For 4K, THX suggests a 40° viewing angle: diagonal ≈ distance × 0.84. For 1080p, about distance × 0.6.
Frequently asked questions
What size TV for 8 feet?
About 81 inches for 4K (a 75–85″ TV).
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