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Room Studio · free 3D room planner

See the TV, the seats and the sound in your own room.

A free 3D planner that checks size, mounting height, sightlines, glare, speakers and bass.

Measure your room once. Room Studio checks the screen size, mounting height, sightlines, glare, speaker placement and bass against the standards the professionals use, before you buy or drill.

Start your room

Opens in your browser. No account; the room is saved on this device only.

1 / 4 Which size fits? The viewing angle from every seat, as the screen grows from 55 to 75 inches.
The complete guide · 2026 edition

Home theater setup, every step in order

Nine steps from layout to calibration, sized to your room, with this year’s picks and complete systems priced from $1,500 to $20,000.

  1. 1Layout
  2. 2Screen
  3. 3Mount
  4. 4Seats
  5. 5Speakers
  6. 6Bass
  7. 7Room
  8. 8Connect
  9. 9Calibrate
Read the setup guide →
A living-room home theater at evening: TV on the wall, speakers placed, sofa facing the screen.
Start with a question

Three things everyone asks

Every guide answers first, shows the numbers, and opens Room Studio already set up for the question. In the renders, green tags meet the guideline and mauve tags miss it.

What size? TV size & viewing distance Exact dimensions for every size from 32 to 100 inches, real models, and how far each one wants you to sit.
Where should it go? Mounting height, fireplaces & glare How high to hang it, what a mantel does to your neck, and where window reflections land.
How will it sound? Speakers, subwoofers & acoustics Soundbar or 5.1, where the sub goes, and the cheapest fixes for an echoey room.
What Room Studio checks

One room, eight checks

One score up front; every detail is a click away. The models and their sources are on how Room Studio works.

Screen sizeThe angle the picture fills from each seat (SMPTE, THX, RP22).
Mounting heightHow far up you look, against THX’s 15° guideline.
SightlinesWhether every seat sees over the heads in front.
GlareWhere windows and lamps reflect on the screen.
Speaker placementAngles and heights against Dolby and ITU layouts.
BassA virtual subwoofer crawl: where bass is even and where it booms.
Echo & reflectionsFirst reflections, decay time and where a panel helps.
Real products409 pieces, 80 TVs among them; 267 are real products at their makers’ published sizes.

Open Room Studio

Room templates

Start from a room like yours

All templates

Apartment living room 15 × 12 ft · 75″ TV · soundbar
Family room 20 × 16 ft · sectional · 85″ TV · 5.1
Open-plan great room 18 × 15 ft · open side · 83″ TV · 3.1
Basement home theater 15 × 22 ft · 120″ screen · two rows · 7.1
Rec room 30 × 20 ft · pool table · bar · 85″ TV
Cozy den 12 × 11 ft · loveseat · 65″ TV · soundbar
Gaming den 13 × 12 ft · 75″ TV · consoles · 5.1
L-shaped living room 20 × 17 ft L-shape · 65″ TV · 3.1
Popular guides

Answers, with the numbers behind them

Each figure comes from a standard, a manufacturer’s documentation or a measurement, and says which. Where a common rule of thumb has no source, we say that too, and we tested the popular ones.

SMPTE ST 2080-3THXCEDIA/CTA RP22ITU-R BS.775Dolby AtmosUNICANSUR II