What size 4K TV you should buy really comes down to how much space you have, how far you're going to sit from your display, and what your budget is. In general, bigger TVs cost more than smaller ones with comparable features, and you'll need to have enough wall space or a large enough TV stand to accommodate whatever display you get. TV sizes typically start as small as 24 inches and can go up to 98 inches. A few manufacturers have premium models that are even larger. A lot of companies reserve their best picture quality and design features for their bigger sizes. Though not a hard rule, midrange features are often reserved for models that are 50 inches or larger, and high-end features tend to start in 55-inch models.  Most companies use 65 inches as their flagship size to highlight their best 4K TVs, and for many people, 65 inches hits just the right sweet spot to offer a solid home theater experience without taking up too much real estate or totally breaking the bank.  If space and budget aren't a concern, what size 4K TV you should get can be best determined by how far you plan to sit from your display. This is because the benefits of 4K resolution become most noticeable when you sit at a distance of about one to 1.5 times the size of your TV. For instance, to get the most out of a 65-inch 4K TV, you should sit between 5.4 and 8.1 feet from your TV. Crutchfield has a handy chart that provides recommended 4K TV sizes based on your seating distance.