How Many Acoustic Panels Do I Need?
Updated
Most rooms need acoustic panels covering 15 to 25% of the wall area, and for a 12 by 15 ft room with an 8 ft ceiling that works out to 9 to 14 panels of 2 by 4 ft. That's Primacoustic's starting point (opens in a new tab). Studios want 25% or more.
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Enter your room. The defaults are the worked example below.
Coverage method: wall area is 2 × (length + width) × height. Cover 15 to 25% of it (Primacoustic's starting point (opens in a new tab)) and divide by the area of one panel, rounding up. A 12 by 15 ft room with an 8 ft ceiling has 432 sq ft of wall: 64.8 to 108 sq ft of panels, or 9 to 14 panels of 2 by 4 ft.
Exact method: follow the four steps on this page with the Sabine formula (opens in a new tab). The worked example gives 13 panels.
Based on: How Many Acoustic Panels Do I Need?
Rule: Sabins needed = 0.049 × volume in cu ft ÷ target reverb time, from the Sabine formula (opens in a new tab).
If you want an exact count:
- Measure. Get the room volume and the wall, ceiling and floor areas.
- Add up the absorption you've already got. Area × coefficient: drywall 0.05, carpet 0.25 (Johns Manville (opens in a new tab)), laminate 0.10 (University of Edinburgh (opens in a new tab)).
- Pick a target. Go with 0.5 s for a bedroom, 0.4 to 0.7 s for an office (Siniat (opens in a new tab)).
- Divide. Take the shortfall and divide it by what one panel adds: its area × (NRC minus 0.05 for the drywall it covers up). Round up.
Example: An empty 12 x 15 x 8 ft bedroom is 1,440 cu ft. Drywall walls and ceiling give 612 sq ft × 0.05 = 30.6 sabins and a laminate floor 180 × 0.10 = 18, so 48.6 total (a 1.45 s reverb). A 0.5 s target needs 0.049 × 1,440 ÷ 0.5 = 141.1, so you add 92.5. A 2 by 4 ft panel of 2 in. Owens Corning 703 (opens in a new tab) (NRC 1.00) adds 8 × 0.95 = 7.6, and 92.5 ÷ 7.6 = 12.2, so 13 panels.
Thirteen panels cover 24% of the walls, so the two methods line up. A furnished room needs fewer. Bass needs thick panels or corner traps. Where to place acoustic panels tells you where to start.
How many soundproof panels will stop a neighbor's noise? None. Blocking takes mass and sealed construction, as the soundproof panels guide explains. There are more answers in the soundproof panels FAQ.