Measure sofa-to-wall first, then pick a diagonal that still fits the cabinet. This table is a viewing-distance cheat sheet — not a brightness or HDMI spec sheet. Shop links are Amazon search URLs with tag whatsizetobuy-20 only.
| Sofa to screen | Start with this diagonal | Skip bigger if |
|---|---|---|
| About 6 ft / 1.8 m | 43–50 inch | The TV stand is under 40 inches wide |
| About 8 ft / 2.4 m | 55–65 inch | You sit closer than 7 ft on movie nights |
| About 10 ft / 3.0 m | 65–75 inch | The wall has a window glare stripe at evening |
| 12 ft / 3.6 m or more | 75 inch and up | You cannot leave 4+ inches of wall on each side |
How to measure: sit where you actually watch, not from the doorway. Tape the wall width. If width is tight, drop one size rather than hanging a set that touches the trim.