Should I buy a 75-inch TV if I sit 8 feet away?

Yes—buying a 75-inch TV for an 8-foot viewing distance is reasonable if you want an immersive, theater-like feel, especially for 4K movies, sports, and gaming. At 8 feet, a more conservative sizing rule points closer to about 60 inches, while a more cinematic THX-style recommendation would be closer to around 80 inches, so 75 inches lands on the immersive side but not wildly oversized.

My practical recommendation: choose 75 inches if your room layout can handle it and you mostly watch HD/4K content. Choose 65 inches instead if you watch a lot of cable, older shows, lower-resolution streams, or you prefer a less dominant screen in the room.