Room Size Basics
Use the room dimensions to pick realistic seating, screen, and speaker targets.
Start with the main seat
The main seat drives almost every useful home theater decision. Measure from eye position to the screen wall, then choose screen size, TV height, speaker spacing, and cable paths from that point. Avoid planning from the back wall or from the TV size alone.
Respect room proportions
Very square rooms and rooms with equal width and height tend to make bass harder to control. You can still build a good system, but subwoofer placement and seating distance become more important than buying larger speakers.
Leave space behind the couch
A couch directly against the back wall often makes bass uneven and surround speakers less convincing. Even twelve to twenty-four inches of breathing room can improve rear-wall reflections and make surround effects less obvious.
Choose practical screen size
A screen that fills roughly 30-40 degrees of your field of view works well for many people. Bigger can feel more cinematic, but only if subtitles, games, and sports remain comfortable from your actual seat.
Use the planner
Enter the real width and length, then compare the suggested TV size, speaker angles, and subwoofer options before buying gear. Treat the drawing as a starting layout and adjust for doors, windows, fireplaces, and safe walking paths.