HesapHanem

Acoustic Treatment Calculator

Enter your room dimensions and panel size to estimate the panels you need.

How it is calculated

Enter the room length, width and ceiling height in feet. Optionally enter a target coverage in percent and the area of one panel in square feet. If the coverage is empty or zero the tool uses 20%, and if the panel area is empty or zero it uses 8 sq ft, the area of a 2 ft × 4 ft panel.

total surface = 2 × (L × W) + 2 × (L + W) × H

target area = total surface × coverage ÷ 100

panels = ceil( target area ÷ panel area )

The total surface counts floor, ceiling and all four walls as one sum. Doors, windows and furniture are not subtracted. The panel count is rounded up to whole panels. The areas are rounded to whole square feet in the display, so they are printed with sq ft in every language. This is a rule-of-thumb estimate of how much absorption to buy, not a prediction of reverb time.

Worked example

A home studio that is 14 ft long, 12 ft wide and 8 ft high, using the defaults of 20% coverage and 8 sq ft panels.

  1. Floor and ceiling: 2 × (14 × 12) = 336 sq ft.
  2. Walls: 2 × (14 + 12) × 8 = 416 sq ft. Total surface = 336 + 416 = 752 sq ft.
  3. Target area: 752 × 0.20 = 150.4, shown as 150 sq ft.
  4. Panels: 150.4 ÷ 8 = 18.8, rounded up to 19.

Raising the coverage to 30% would give 226 sq ft of target area and 29 panels.

Try this example →

Common mistakes

  • Entering metres. The dimensions are in feet, so a 4 m × 3.6 m × 2.4 m room must be converted first (about 13.1, 11.8 and 7.9 ft). Typing 4, 3.6 and 2.4 gives a tiny room of 65 sq ft and only 2 panels.
  • Entering the panel area in square metres or as one side length. The field is the area of a single panel in square feet, so a 2 ft × 4 ft panel is 8.
  • Expecting the result to say where the panels go. The tool gives an amount, not a layout; the panels still need to go at first-reflection points and corners.
  • Assuming the 20% default applies to every room. It is a general starting figure; a vocal booth may need more and a lively living space less.
  • Forgetting that doors, windows and the floor are included in the total surface. Because nothing is subtracted, the target area is slightly high for rooms with large openings.

About this calculator

Acoustic treatment uses absorptive panels to reduce sound reflections off hard, parallel surfaces that otherwise cause flutter echo, standing waves and comb-filtering in a room. As a practical rule of thumb, treating roughly 15–25% of a room's total surface area (floor, ceiling and walls) with absorption panels at the first-reflection points is enough to meaningfully tighten the room's sound without over-damping it into a dead, lifeless space; this calculator takes your room dimensions in feet, a target treatment percentage (20% by default), and the area of one panel in square feet (8 sq ft, a 2×4 ft panel, by default) to estimate how many panels that requires.

Home studio owners, podcasters, and audio engineers treating a control room or vocal booth use this kind of estimate before buying foam or fiberglass panels, since under-treating leaves audible ringing on recordings while over-treating kills the natural ambience a mix needs to translate well on other systems. It's a starting budget for a treatment plan, not a substitute for measuring reverb time (RT60) or mapping first-reflection points with a mirror test.

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Comments (1)

  • Editorial team

    The panel count says how much absorption to buy, not where to hang it. A common starting point is the first reflection points on the side walls and ceiling, found by having someone slide a mirror along the wall while you sit in the listening spot. Thin panels do little for low notes, which is the job of thicker traps in the corners. What kind of room are you treating?

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