Based on SMPTE 30° / THX 40° recommendations and 20/20 vision (one arc-minute) · assumes 16:9 · bezel and stand are not included
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TV size is measured diagonally
A 65-inch TV means a 165cm diagonal, not a 165cm width. In 16:9, the actual width is about 87% of the diagonal — 144cm for a 65-inch set. Measuring shelf space as if the inch number were the width leaves you about 20cm short.
The right distance depends on viewing angle
How much of your vision the screen fills is what drives immersion. SMPTE recommends 30° for comfortable everyday viewing; THX recommends 40° for a more cinema-like experience. For a 65-inch TV that’s about 2.7m and 2.0m respectively — the same TV is a completely different experience depending on where you sit.
4K lets you sit closer to a bigger screen
Eyes with 20/20 vision can’t resolve detail finer than about one arc-minute. Below that pixel size, resolution goes to waste. A 65-inch 1080p set shows visible pixels inside about 2.5m, while 4K holds up to about 1.2m — which is why 4K screens can go both bigger and closer without looking worse.
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Frequently asked questions
QWhat size TV should I buy?
Take your seating distance and this calculator will show the size that hits a comfortable 30° viewing angle, plus the larger size for a 40° cinema-like angle.
QIs my current TV too small?
Most people who downsize regret it more often than the reverse — a screen that looks “too big” in the showroom is usually closer to the calculated 30° comfort size once you actually watch it at home.
QWhy does my new 4K TV not look sharper than my old one?
If you’re sitting further than the pixel-visibility distance for your size and resolution, 4K and 1080p are indistinguishable to the eye — the extra resolution only shows up once you sit closer than that limit.