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Acoustic Slat Wall Panel Calculator

Enter your wall and the panel size to see how many slat wall panels you need, how many boxes to order, how wide the last column must be cut and how many spares you will have.

Wall
ft
ft
Slats run
Panel
in
in
%

Results

Boxes to buy5 boxes10 panels · 2 spare after covering the wall
Panels needed8
Panels with waste allowance9
Offcut waste23%
Panel columns
7 (23.6 in wide)
Panels per column
1 full + a 1.5 in piece (63 per panel)
Last column
Cut to 2.4 in wide
Panels to cover the wall
8
Panels to order (+5% for cuts and damage)
9
Wall area
96 sq ft
Panel area purchased
154.9 sq ft
Left uncovered if the last column is not cut
1.6 sq ft (a 2.4 in strip)

Material quantity only: this does not predict acoustic performance (NRC, STC or reverberation) — check the manufacturer’s tested data for that.

Openings such as windows, doors and outlets are not deducted; the offcuts usually cover the extra cuts around them. Check the panel’s exact dimensions, as many are metric (e.g. 600 × 2400 mm ≈ 23.6 × 94.5 in).

How it works

  1. Enter the wall width and height in feet and choose whether the slats run vertically or horizontally.
  2. Enter the panel width and length in inches (or tap a common size) and how many panels come in a box.
  3. Add a small allowance for damaged panels and cutting mistakes.
  4. Read the boxes to buy, the cut width of the last column and how the panel lengths work out.

Formula

Columns = ⌈wall width ÷ panel width⌉ (vertical slats)
Full panels per column = ⌊wall height ÷ panel length⌋; remainder pieces cut from extra panels
Panels = columns × full + ⌈columns ÷ pieces per panel⌉
Boxes = ⌈panels × (1 + extra %) ÷ panels per box⌉

For horizontal slats, width and height swap roles. When the wall is taller than one panel, the leftover height is filled with pieces cut from extra panels, and each extra panel yields as many pieces as fit in its length. The last column is ripped to the remaining width; if you leave it uncut, the calculator shows the strip left uncovered.

Example

A 15 ft 6 in wide living room wall with 9 ft ceilings, covered with vertical 600 × 2400 mm slat panels sold in boxes of 4, allowing 5% extra.

Inputs

Wall width
15.5 ft
Wall height
9 ft
Slats run
Vertically
Panel width
23.6 in
Panel length
94.5 in
Panels per box
4
Extra for damage & mistakes
5 %

Result

Boxes to buy3 boxes12 panels · 2 spare after covering the wall
Panels needed10
Panels with waste allowance11
Offcut waste10%
Load this example into the calculator →

Planning the layout

Most slat wall panels are made of wood-veneer slats glued to a felt backing, so they can be cut to length with a fine saw and ripped between slats with a knife. Centering the panels so both edge columns are the same width often looks better than one full and one narrow column — the total number of panels is the same.

Buy all boxes from the same batch where possible, because veneer color can vary between production runs, and keep a spare panel for future repairs.

Frequently asked questions

How many acoustic slat panels do I need for a 12 ft wall?

With 600 × 2400 mm (23.6 × 94.5 in) panels running vertically, a 12 ft wall needs 7 columns — six full and one cut to about 2.4 in. On an 8 ft wall the panels are 1.5 in short, and one extra panel supplies all the filler strips: 8 panels, or 4 boxes of 2. Many installers hide that gap behind a baseboard instead.

Can I cover a wall taller than one panel?

Yes. Butt a shorter piece above or below each full panel. The calculator counts how many short pieces each extra panel yields.

Do acoustic slat panels improve sound?

Felt-backed slat panels can absorb some mid and high frequencies, but performance depends on the product, mounting and room. This calculator only counts materials; rely on the manufacturer’s tested NRC data for acoustics.

Should I deduct windows and doors?

Usually not. You need partial panels around openings anyway, and the offcuts are rarely enough to save a whole box.