Enter your screen diagonal size and resolution. The tool returns THX optimal (36° horizontal FoV), SMPTE cinema (30°), and the 4K-resolving distance (where you can start to distinguish 4K pixels from 1080p).
Viewing angle at THX distance
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Tip: THX targets a 36° horizontal FoV (immersive). SMPTE targets 30° (comfortable cinema). If you sit further than the 4K UHD max, you get no visible benefit from a 4K panel vs 1080p at the same size.