What Size TV Do You Need? TV Screen Size Calculator

The old adage of "get the biggest TV you can afford" is still broadly valid, but not everyone wants or needs a 100-inch TV. Televisions are one of the few things that get cheaper every year (even the best TVs), so getting a TV that's larger than your current one isn't as costly as it once was. So the question is, how big is too big? There's actually a calculation for that. It depends on your room, your seating distance, and perhaps most importantly, the agreement of any cohabiting co-deciders. Here's how to figure out what size TV to get.CNET's screen size calculator for 4K TVs The numbers don't match TV sizes exactly due to the math involved, but should give you a rough idea what sizes to consider based on how far away you're sitting.

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Excerpt limited to ~120 words for fair-use compliance. The full article is at CNET.