Dolby Atmos speaker placement calculator
Dolby's guidelines describe speaker positions as angles seen from the main seat. This calculator turns those angles into distances in your room: how far apart the front speakers go, where the surrounds sit on the walls and where to cut the ceiling for the overhead speakers.
Results are estimates for planning. Check the manufacturer's manual before you drill, buy or mount anything.
How it works
Angles are measured at the main seat, with 0° pointing at the center speaker. A speaker at angle θ that sits a distance x in front of the seat is x × tan θ to the side of the center line; on a side wall at half the room width, a surround at θ > 90° sits (W/2) × tan(θ − 90°) behind the seat.
The angles come from Dolby's home theater installation guidelines and AV-receiver manuals: front left and right at 22°–30°, side surrounds at 90°–110°, rear surrounds at 135°–150°. For overhead speakers in a 7.1.4 reference layout, Dolby gives a 45° elevation from the seat (adjustable from 30° to 55°), so with ceiling height C and ear height E the top front speakers sit (C − E) / tan 45° in front of the seat. Overhead pairs are about as far apart as front speakers placed at ±30°, which Dolby puts at 0.5 to 0.7 of the layout's width; in narrow rooms the width limit decides.
Assumptions and limits
- It assumes one main seat on the room's center line. With several rows, center the overhead speakers over the seating area, as Dolby suggests.
- If speakers cannot be equidistant from the seat, set the distances in the AV receiver so their sound arrives together.
- Dolby Atmos-enabled (upward-firing) speakers follow different rules; see the guidelines.
Sources
- Dolby Atmos Home Theater Installation Guidelines (Dolby, PDF)
- Speaker installation angles, AV-receiver manual (Denon)
Last reviewed: November 2026.