TV Size Calculator
Find the ideal TV size for your room or the best viewing distance for a screen you own. Free online TV size calculator with SMPTE, THX and 4K/8K presets.
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Part of the toolkit
How to use TV Size Calculator
- 1Choose a mode: enter your TV size to find the ideal viewing distance, or enter your seating distance to find the right TV size to buy
- 2Pick your aspect ratio (16:9 TV, 21:9 ultrawide monitor or 4:3) and your preferred units, feet or meters
- 3Compare the SMPTE, THX and Immersive 4K/8K presets, optionally add your room width to check it fits, then copy the result
Frequently asked questions
What is the best distance to sit from a TV?▾
It depends on screen size and how immersive you want it. As a rule of thumb, sit about 1.0-1.3x the screen diagonal away for an immersive 4K/8K setup, or up to 1.7x the diagonal for the more relaxed SMPTE reference angle.
How is the recommended viewing distance calculated?▾
The calculator uses the screen width (from the diagonal and aspect ratio) and a target horizontal viewing angle (30 degrees SMPTE, 36 degrees THX, 40 degrees immersive), then solves distance = width / (2 x tan(angle / 2)).
What TV size should I buy for my room?▾
Switch to 'I have a distance, find TV size', enter how far your couch is from the wall, and the tool gives you a recommended diagonal range across the three viewing-angle presets.
Does aspect ratio change the result?▾
Yes. At the same diagonal size, a 21:9 ultrawide screen is wider than a 16:9 TV, and a 4:3 screen is narrower, so the recommended distance changes even though the diagonal is the same.
Embed TV Size Calculator on your website▾
Paste this snippet into your page. The embedded tool runs in your visitor's browser and shows a small “Powered by clkr.work” link.