Optimal viewing distance is primarily determined by your TV's screen size and resolution. Different industry standards and recommendations exist, but they generally aim for a viewing angle that allows your eyes to comfortably take in the entire screen without excessive movement or visible pixels.
Common formulas often involve multiplying the screen size (diagonal measurement) by a factor:
- THX Recommended (Cinematic): Screen size (inches) x 0.84 (for 1080p/4K)
- SMPTE Recommended (Professional): Screen size (inches) x 1.6 (for 1080p) or x 1.0 (for 4K)
- General Rule of Thumb (4K TVs): Screen size (inches) x 1.0 to 1.5
- General Rule of Thumb (1080p TVs): Screen size (inches) x 1.5 to 2.5
These factors are based on achieving a certain viewing angle (e.g., 30-40 degrees for cinematic immersion) and ensuring individual pixels are not discernible at the given resolution.