Calculate how many acoustic panels to buy for a coverage target you choose. Enter your room or wall size, panel dimensions, existing panels and pack size. Get a clear area breakdown and an optional material cost.
How many acoustic panels do I need?
For a chosen physical coverage target, multiply the reference surface area by the target percentage, divide by the face area of one panel, then round up to a whole panel. Subtract matching panels already installed to find how many more you plan to fit.
For example, 32 m² of net wall area at a chosen 20% coverage target needs 6.4 m² of panel face area. Each 60 × 120 cm panel covers 0.72 m². Dividing 6.4 by 0.72 gives 8.89, so the area estimate is 9 whole panels. Their combined face area is 6.48 m², or 20.25% of the net wall area.
That answers the quantity question for your target. It does not establish that 9 panels will solve an echo problem. The right treatment depends on the room, how it is used, the product's tested performance and where it is installed.
Choose the right area for the percentage
Coverage percentages are only comparable when they use the same reference area. Twenty percent of one wall is different from twenty percent of all walls, and different again from twenty percent of the walls plus ceiling.
- All four walls: 2 × (room length + room width) × wall height.
- Ceiling only: room length × room width.
- Four walls and ceiling: add those two areas.
- One rectangular surface: width × height or length.
- Net reference area: selected gross area minus the areas you exclude.
Measure a rectangular room internally and use one consistent wall height. For a sloped ceiling or irregular room, divide the project into simple sections and plan each separately. This calculator does not infer a sloped surface from floor dimensions. If you combine separate estimates, combine the panel counts before rounding the final purchase to packs.
Openings can be deducted to create a net area for this purchasing plan. If an acoustic specification gives a percentage of gross walls, leave exclusions at zero to preserve that basis. Do not change the denominator while keeping a percentage intended for a different area.
Panel count and pack formula
Panel face area = panel width × panel height, converted to the same area unit as the room.
Target face area = net reference area × chosen coverage percentage ÷ 100.
Target panel count = target face area ÷ one panel's face area, rounded up.
Additional panels to install = target count minus already installed panels, with a minimum of zero.
New panels needed = additional panels + desired spare panels minus usable uninstalled stock, with a minimum of zero.
Packs to buy = new panels needed ÷ panels per pack, rounded up. New pack cost = packs × entered price per pack.
Only installed panels count towards coverage. Spare panels and extra panels left after pack rounding do not. When your installed panels already exceed the chosen target, the calculator keeps them in the plan and shows zero additional panels to install.
Worked example: a small home office
Take a room 4 m long, 3 m wide and 2.5 m high. Select all four walls. The gross wall area is 2 × (4 + 3) × 2.5 = 35 m². Exclude a combined 3 m² for a door and window, leaving 32 m². Choose 20% for this example and use panels measuring 60 × 120 cm.
- The target is 6.4 m², which rounds up to 9 panels.
- With 2 matching panels already installed, add 7 panels.
- You have 1 usable panel in stock and want 1 spare after installation.
- The purchase requirement is 7 + 1 − 1 = 7 panels.
- At 4 panels per pack, buy 2 packs, containing 8 panels.
- After using stock and installing 7 panels, 2 panels remain: the requested spare plus 1 extra.
- At an illustrative €180 per pack, the new panel cost is €360.
The example button loads these values. The price and coverage target are sample inputs. They are not current product prices or a treatment recommendation.
What percentage should I cover?
Start with the target for your specific project or ask the panel supplier for a room assessment. A speech-focused office, a music room and a home cinema can need different treatment. This tool deliberately leaves the coverage target blank so a sample percentage does not become an automatic recommendation.
GIK Acoustics explains how panel thickness affects the frequencies a panel can treat. Similar face areas can behave differently when panel construction, thickness or installation changes. Use the product's relevant test data and a placement plan, not area alone, to assess likely results.
Does 20% coverage mean 20% less noise?
No. Here, 20% means that panel faces occupy one fifth of the selected net reference area. It is a geometric quantity. It does not mean 20% less echo, 20% lower sound level or a particular change in reverberation time.
Armstrong's acoustic performance FAQ describes NRC as an average sound absorption rating at 250, 500, 1,000 and 2,000 Hz. NRC is not the same as the fraction of your walls covered by panels. This calculator does not multiply coverage by NRC or turn it into a room performance claim.
Will acoustic panels soundproof a room?
Acoustic treatment and sound isolation solve different problems. Absorptive panels address sound reflections within a room. They should not be treated as a promise that noise will stop reaching a neighbouring room. Acoustimac's treatment FAQ makes this distinction when explaining its panels. If your main problem is sound passing through walls, doors or windows, get advice on that transmission path before buying panels for it.
Check the layout before you order
An area calculation cannot prove that a set of rectangles fits around a door, window, socket or furniture. Sketch the actual wall, mark obstacles and add each panel at its full size. Leave any spacing required by the product and your design. Gaps between separate panels do not add to the panel face area.
The tool warns when a whole panel is larger than every selected rectangular surface, or when rounding to whole panels exceeds the net area. Passing those checks still does not prove that all panels fit. It does not create a cutting plan, reuse offcuts or decide where to place absorption.
Use the product's installation instructions for the mounting surface, fixing method, weight and any required clearances. For ceiling work, confirm the product and mounting system are suitable for that use. Check any fire-performance requirements that apply to the space.
Common questions
Can I use feet for the room and centimetres for the panels?
Yes. Room dimensions, panel dimensions and area values have separate unit selectors. The calculator converts them internally. Enter decimal feet, such as 8.5 for 8 feet 6 inches, or choose inches. Changing a unit converts entered dimensions instead of reinterpreting the same number.
Can I count panels I already own?
Yes. Enter matching panels already mounted on the selected surfaces in the installed field. Enter matching panels still available for installation in the stock field. Do not include damaged panels, offcuts, other sizes or the same panel in both fields.
Can I use this for slat panels, hexagons or ceiling baffles?
The quantity model assumes complete rectangular panels with known face dimensions. For a rectangular slat panel, its overall face area can be used for physical coverage, but this does not verify its sound absorption. Hexagons, irregular shapes and suspended baffles need their actual geometry and a suitable product-specific plan. Do not use a bounding rectangle as if it were their actual panel area.
What if panels come in different sizes?
This tool uses one panel size at a time. A mixed-size design needs a separate schedule listing the count and actual face area of every size. Adding the areas can describe coverage, but the installed-panel and stock counts here must refer to the single size entered.
Which tools can help with the rest of the room?
Use the paint calculator for wall finishes, the gallery wall calculator for artwork spacing, or the LED strip power supply calculator for a lighting project.
