Use Case
How Many Cool Room Panels Do I Need? Simple Calculation Guide (2026)
One of the most common questions we get is: “How many cool room panels do I need?” In this guide, we’ll show you the simple way to estimate wall + ceiling panels using common panel cover widths (1150mm / 1000mm), plus a real example for a 3m × 3m × 2.4m cool room.
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1) Understand Cool Room Panel Cover Width
When calculating quantities, always use the effective cover width (not the “overall sheet width”). In Australia, the most common cover widths are:
- 1150mm (1.15m) cover width — commonly used for wall panels (e.g. 50mm EPS wall panel)
- 1000mm (1.0m) cover width — commonly used for roof panels in many systems
Tip: If you’re using our standard EPS wall panels, calculations are typically based on
1.15m cover width.
2) How to Calculate Wall Panels
Step 1: calculate the perimeter (all wall lengths added together).
Wall panels formula:
Wall Panels = Perimeter ÷ Panel Cover Width
3) How to Calculate Ceiling Panels
Step 2: choose the direction your ceiling panels will run, then divide the span by panel cover width.
Ceiling panels formula:
Ceiling Panels = Room Width (or Length) ÷ Panel Cover Width
Example: 3m × 3m × 2.4m Cool Room
Quick Summary
| Section | How to Calculate | Result |
|---|---|---|
| Walls | Perimeter ÷ 1.15m cover width | 11 panels |
| Ceiling | Span ÷ 1.15m cover width | 3 panels |
| Total | Walls + Ceiling | 14 panels |
Common Mistakes to Avoid
- Using the wrong width: always calculate using the cover width (e.g. 1150mm).
- Forgetting the ceiling: roof/ceiling panels are essential for insulation performance.
- Not allowing for waste: add 1–2 spare panels for cutting, door openings, and adjustments.
- Ignoring openings: doors/windows change your cut plan — spare material saves you time.
FAQ
Should I order extra panels?
Yes — we recommend adding 1–2 spare panels to allow for cutting, mistakes, and small infill pieces.
Is 1150mm the panel width or cover width?
It refers to the cover width (effective coverage after joints). Always calculate using cover width.
Can you cut panels to height?
Yes — many projects use 2.4m panels and cut down to suit. If you want, we can advise the cleanest cut plan based on your room size.
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