How the TV size calculator works
Screen size recommendations are based on viewing angle — how much of your field of view the picture fills. The Society of Motion Picture and Television Engineers (SMPTE) recommends at least 30 degrees for a comfortable, immersive image. THX suggests about 40 degrees for a true cinema feel. We use roughly 28 degrees for casual viewing, 34 degrees for a balanced setup and 40 degrees for a cinematic one.
For a 16:9 TV, the screen width is about 0.87 times the diagonal. From your distance and the chosen angle we calculate the ideal width, convert it to a diagonal and round it to the nearest common TV size. We then check the result against your wall or stand width, leaving a small margin for the bezel and stand.
Resolution check: people with normal vision can resolve about one arcminute of detail. We calculate the distance at which individual 1080p and 4K pixels become indistinguishable for your screen size and tell you whether 4K (or 8K) actually adds visible detail where you sit. Energy use is estimated from typical power draw per square inch of screen area for modern LED and OLED TVs in standard picture mode.
Smart TV buying guide
Common sizes and their dimensions
| Diagonal | Width | Height | Ideal distance |
|---|
| 43" | 37.5" | 21.1" | 4.3–5.8 ft |
| 55" | 47.9" | 27.0" | 5.5–7.5 ft |
| 65" | 56.7" | 31.9" | 6.5–8.8 ft |
| 75" | 65.4" | 36.8" | 7.5–10.2 ft |
| 85" | 74.1" | 41.7" | 8.5–11.5 ft |
Panel types
OLED panels light each pixel individually, giving perfect blacks, infinite contrast and wide viewing angles. They shine in dim rooms. Mini-LED uses thousands of tiny backlight zones and can reach 1,500–3,000 nits, making HDR pop in bright rooms. QLED / standard LED TVs offer good brightness at lower prices but with less precise contrast. VA LCD panels have deep blacks but narrow viewing angles, while IPS panels keep colors stable from the side.
Refresh rate and gaming features
A native 120 Hz panel makes sports and fast camera pans smoother. Gamers should look for HDMI 2.1 ports supporting 4K at 120 Hz, variable refresh rate (VRR), auto low latency mode (ALLM) and input lag under 15 ms in game mode. Beware of "motion rate" figures, which are marketing numbers, not true refresh rates.
HDR formats
HDR10 is universal. Dolby Vision is widely used by streaming services; HDR10+ is supported by some services and brands. Brightness matters more than logos: a TV needs roughly 700+ nits to show HDR highlights convincingly.
Smart platform and sound
All major platforms stream the main services, so choose the interface you find easiest. Built-in speakers on thin TVs are limited — budget for a soundbar if dialogue clarity matters to you.
FAQ
What size TV should I get for my viewing distance?
Multiply your distance in inches by about 0.6 (minimum) and 0.84 (maximum). At 8 feet (96") that's roughly 59–80 inches.
Is 4K worth it?
Yes for 55" and larger at typical living-room distances. On small screens viewed from far away, the difference over 1080p is hard to see.
OLED or Mini-LED?
OLED for dark-room movie lovers; Mini-LED for bright rooms, daytime sports and anyone who wants maximum HDR brightness.
Can a TV be too big?
If you have to turn your head to follow action, or you see pixel structure, the screen is too big for your distance. Most people adapt quickly to a larger TV, though.
How high should I mount my TV?
Put the center of the screen near seated eye level — around 40–44 inches from the floor for a typical sofa.
About ScreenSense
ScreenSense is an independent, free tool that helps you choose a TV using established viewing-angle and visual-acuity standards instead of marketing claims. We are not affiliated with any TV brand or retailer.
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Last updated: October 2026
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The calculator and content are provided for general information, "as is", without warranties. Real dimensions, brightness and power consumption vary by model. Verify specifications and wall-mounting requirements (including VESA pattern and wall load capacity) with the manufacturer or a qualified installer. We are not liable for decisions based on this site. Trademarks belong to their owners. Third-party ads are not endorsements.