Enter your room and seat position. The calculator returns where each speaker goes on the wall, in feet from a fixed reference, and draws a top-down map.
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Every surround system is mixed against the same reference geometry, and placement is just that geometry scaled to your room. The calculator above takes your room width, length and seat position, then solves for where each speaker sits on the walls. It uses the layouts published in ITU-R BS.775 (the multichannel stereo reference used for 5.1 mixing) and Dolby's home theater speaker guidance for 7.1: front left and right at 22 to 30 degrees from the center line, side surrounds at 90 to 110 degrees, and rear surrounds at 135 to 150 degrees.
The only math is basic trigonometry. A speaker at angle A from straight ahead, measured from your seat, sits distance x tan(A) to the side of the center line when it is on the front wall. If your seat is 10 feet from the front wall and you want 30 degrees, each front speaker is 10 x tan(30) = 5.8 feet left or right of center. Surrounds work the same way, except the speaker travels along the side wall until it meets the angle you picked, which is why the table tells you how far back from the front wall each one goes.
For a 5.1 system the question people actually ask is how far apart to put the front left and right speakers. The table below is the answer for the common seat distances, and it is the same math the calculator uses. If the width does not fit your screen wall, drop to 22 degrees rather than pushing the speakers into the corners: a narrower front stage still images correctly, a speaker jammed against a side wall does not.
| Seat distance to front wall | Left/right offset at 22 degrees | Left/right offset at 30 degrees | Gap between left and right at 30 degrees |
|---|---|---|---|
| 8 ft | 3.2 ft | 4.6 ft | 9.2 ft |
| 10 ft | 4.0 ft | 5.8 ft | 11.6 ft |
| 12 ft | 4.8 ft | 6.9 ft | 13.8 ft |
| 14 ft | 5.7 ft | 8.1 ft | 16.2 ft |
| 16 ft | 6.5 ft | 9.2 ft | 18.4 ft |
The center channel carries most of the dialogue, so it stays on the center line with its tweeter near seated ear height. Behind an acoustically transparent screen, that is straightforward. Under a TV, tilt the speaker toward the seat. Above a TV, tilt it down. Either way, keep the front three roughly the same distance from the seat so they arrive together; the receiver can delay the closer ones, but you should start close.
This is the reference chart behind the calculator. It matches the longer explanation in our surround sound speaker placement guide, which covers mistakes and fixes in more detail.
| Speaker | 5.1 layout | 7.1 layout | Reference |
|---|---|---|---|
| Center | 0 degrees (on the center line) | 0 degrees | Tweeter near ear height, directly above or below the screen |
| Front left / right | 22 to 30 degrees | 22 to 30 degrees | Dolby layout guidance; ITU-R BS.775 uses 30 degrees |
| Side surrounds | 100 to 120 degrees | 90 to 110 degrees | ITU-R BS.775 for 5.1; Dolby for 7.1 |
| Rear surrounds | not used | 135 to 150 degrees | Dolby 7.1 guidance |
| Subwoofer | Front wall or corner, then test positions | Same | Position by measurement, see below |
Two practical notes. First, 5.1 surrounds at 110 degrees and 7.1 side surrounds at 90 degrees describe the same physical location in many rooms, which is why the calculator switches the side angle for you when you change layout. Second, if the room forces you to choose, a pair of side surrounds placed correctly beats four surrounds placed badly. Add the rear pair only when the seat has at least a few feet of clearance behind it.
There is no angle for a subwoofer, because low frequencies are not localized the way mids and highs are. What matters is how your room reinforces bass at the seat. Two methods work, and neither needs software. The first is the subwoofer crawl: put the sub in your listening seat, play a bass-heavy track, and crawl around the room's perimeter to find where bass sounds smoothest, then place the sub there. The second is measurement: try two or three candidate positions and compare the receiver's room correction graph or a free measurement app with a calibrated microphone. The front wall near the center or a front corner is the usual starting point because it matches how most rooms are laid out and keeps cable runs short.
If one sub sounds boomy in one seat and thin in another, a second subwoofer in a different position is the standard fix; two moderate subs generally smooth out seat-to-seat variation better than one large one. Our subwoofer guide covers specific models.
This calculator places speakers only. To lay out the display, seating and speakers together, use the home theater room planner, which draws screen, seats and speakers to scale. For rows of seating on risers, see the seating rows calculator. If your layout includes ceiling speakers, the Atmos angle calculator handles height speaker positions for 5.1.2, 5.1.4, 7.1.2 and 7.1.4, and the Dolby Atmos speaker hub compares the layouts. Pick the screen first, because it sets seat distance, which sets everything on this page: the screen size calculator does that part.
Want the whole sequence in one document? The Home Theater Blueprint walks through display, seat, speakers and cabling in the order that avoids rework.
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A complete 5.1.4 package with height modules, so the angles in this calculator and the height angles in the Atmos calculator apply to one purchase.
Floorstanding fronts need more room from the front wall than bookshelf speakers, so check the offset table above before you order. A strong fit for rooms around 14 feet wide and larger.
Runs a full 7.1 layout and includes Audyssey room correction, which sets distances and levels after you place speakers using this calculator.
A bookshelf pair that works as fronts or as surrounds, useful in small rooms where floorstanding speakers will not fit the offsets above.
Place the front left and right speakers at 22 to 30 degrees from the center line as seen from your seat. At 10 feet from the front wall, 30 degrees puts each speaker 5.8 feet from center, so they are about 11.5 feet apart. At 22 degrees they are 4 feet from center and about 8 feet apart.
Surrounds go on the side walls at roughly 100 to 120 degrees from straight ahead, which is slightly behind the main seat, and about 2 feet above seated ear height as a starting point. In many rooms that is level with or just behind the back of the sofa.
The side surrounds move forward to 90 to 110 degrees and a new pair of rear surrounds goes on the back wall or rear side walls at 135 to 150 degrees. This calculator switches the side angle for you.
Ideally yes, because sound from every speaker then arrives together. In real rooms they will differ, and the receiver's distance settings or automatic room correction add delay to the closer speakers so the arrivals line up.
On the center line of the screen, with the tweeter close to seated ear height, directly below or above the display. Behind a perforated or acoustically transparent screen is ideal. Aim it at the main seat.
Yes. The room planner on this site lays out screen, seating and speakers to scale. The calculator on this page is the speaker-only version with exact distances.