How Many Wall Panels Do I Need? A Simple Calculator Guide

The Basic Calculation

Calculating how many panels you need is straightforward — but two common mistakes (not accounting for waste and not measuring accurately) lead to either running short mid-installation or over-ordering significantly. Here's the correct method.

Step 1: Measure the Wall Area

Measure the wall width and height in metres. Multiply to get the total square metres (m²).

Example: Wall 4.2m wide × 2.4m high = 10.08m²

If the wall has a window or door, subtract its area: a standard door is approximately 2.0m × 0.9m = 1.8m². A standard window is approximately 1.2m × 1.0m = 1.2m².

Step 2: Find Your Panel Coverage Area

Check the product specification for the panel's coverage area per unit. Panel sizes vary significantly by brand and product:

• Standard full-height slat panels: typically 2.4m × 0.6m = 1.44m² per panel
• Modular tile panels: typically 0.6m × 0.6m = 0.36m² per panel
• Groove/mosaic panels: typically 0.5m × 0.5m = 0.25m² per panel

The SoundPanel™ acoustic slat panels and GroovePanel® mosaic panels both include coverage information in their product listings.

Step 3: Divide and Add Waste

Divide your wall area by the panel coverage area to get the base panel count. Then add a waste allowance:

• Simple rectangular wall, no cuts: Add 5–8% waste
• Wall with one or two obstructions (sockets, etc.): Add 10–12% waste
• Angled cuts (staircase), multiple obstructions: Add 15–20% waste

Example continued: 10.08m² wall ÷ 1.44m² per panel = 7 panels base. Add 10% waste = 7.7 → order 8 panels.

Step 4: Check Against Panel Width

Don't just calculate by area — also check the panel count against your wall width. If your wall is 4.2m wide and each panel is 0.6m wide, you need 4.2 ÷ 0.6 = 7 panels across. If this doesn't match your area calculation, the discrepancy is likely due to ceiling height variation — resolve by using the higher number.

The Two Most Common Ordering Mistakes

Under-ordering by Not Accounting for Waste

The most costly mistake. Running out of panels mid-installation means waiting for a reorder — and if the batch changes (dye lots, grain variation), the new panels may not match perfectly. Always round up and add the appropriate waste percentage. The cost of one extra panel is far less than the cost of a mismatched reorder.

Not Ordering Samples First

Ordering a full wall of panels based on product photography alone is a risk. Screen colour rendering varies, and the way wood grain reads in your specific room lighting can differ significantly from the product image. Order a sample first, live with it in the room for a few days under different lighting conditions, then place the full order. The Panel Hub offers sample ordering for exactly this reason.

Quick Reference Table

Also Order: Trim and Adhesive

Don't forget consumables in your order calculation:

• Trim strips: One per exposed edge. Measure all edges where the panel meets a wall, ceiling, or floor without a continuous panel run.
• Adhesive: One 290ml cartridge typically covers 2–3 panels. Order enough for your full panel count plus one spare.

Browse the full wood wall panel collection to check coverage specs for your chosen panels before calculating.