What problem this solves
The classic “TV size = viewing distance / 3” rule is from the 1990s and assumes 1080p resolution. Modern 4K TVs let you sit roughly 1.5× closer for the same perceived sharpness, which means a 65-inch TV that the old rule said needed a 3 m seating distance now works at 2 m. The calculator applies the modern rule and adds the angle dimension — because seating distance isn’t just about pixel visibility, it’s about immersion. A cinema viewer wants the screen to fill more of their peripheral vision than a casual viewer.
The content dimension is what most calculators skip. Sports fans benefit from closer viewing because they want to read player numbers; gamers need very close viewing for reaction-time detail; cinema benefits from a wider angle for immersion; mixed viewing sits in the middle. The calculator picks the right balance.
Who it’s for
- Living room designers sizing a TV for a sofa layout
- Home cinema enthusiasts planning a 4K viewing room
- Gamers setting up a console station at the right distance
- Bedroom designers picking a TV that’s not too big for the viewing angle
Why angle, not just distance
The cinema industry settled on two standards: SMPTE (30°) for general-purpose viewing and THX (36°) for immersive cinema. A 36° angle places the screen about 1.2× wider in your field of view than a 30° angle, which most viewers experience as “more cinematic.” Casual viewing at 20° feels more relaxed and is easier on the eyes for long sessions. The calculator lets you pick your preference and returns the corresponding distance.
Limitations
- Eye level assumed at 120 cm (seated adult); adjust 5 cm down for kids or up for tall viewers.
- No HDR or OLED-specific considerations; both add perceived contrast and can be sat slightly closer.
- 8K is treated like 4K for distance — both let you sit close without seeing pixels.
- Sound bar / centre speaker placement below the TV may affect vertical viewing comfort; not modelled.
- Curved TVs change the effective angle; calculator assumes flat panel.
Practical rules of thumb
TV height: centre of screen at seated eye level (≈ 100–110 cm from the floor) for living room; 110–120 cm for home cinema (raise the bottom slightly so the viewer looks slightly down, mimicking a theatre). Distance: 4K TVs at THX angle give the most cinematic feel; 1080p TVs at SMPTE angle avoid visible pixels. Multi-row seating (home theatre): row 1 at recommended distance, row 2 at recommended + 1.2 m, row 3 at recommended + 2.4 m, with each row raised 25 cm so sightlines clear.