MihsabaHow to use
Calculate net insulation area and whole packs from surface area, openings, pack coverage and waste.
- Enter Surface area (m²).
- Enter Openings (m²).
- Enter Coverage per pack (m²).
- Enter Waste (%).
- Calculate, then review the assumptions before purchasing.
How it is calculated
Example
Ninety square metres minus 10 m² of openings, with 5% waste and 6.5 m² per pack, requires 13 packs.
Important notes
The calculator estimates quantity only; it does not select thermal resistance or suitable thickness. Use project specifications and local requirements to choose the insulation, then enter the correct pack coverage.
Worked examples and interpreting results
Ninety square metres minus 10 m² of openings, with 5% waste and 6.5 m² per pack, requires 13 packs.
| Case | Calculation | Result |
|---|---|---|
| Adjusted area | (90 − 10) × 1.05 | 84 m² |
| Packs | ceil(84 ÷ 6.5) | 13 |
How to check the result
The calculator estimates quantity only; it does not select thermal resistance or suitable thickness. Use project specifications and local requirements to choose the insulation, then enter the correct pack coverage.
Frequently asked questions
Does this choose insulation thickness?
No. Thickness and thermal performance are design requirements; this tool only estimates coverage quantity from your inputs.
Should I include waste?
Include an allowance when cuts, breakage or layout losses are expected. Use a percentage that fits your project rather than assuming one fixed rate.
Do the units need to match?
Yes. The calculator assumes the units stated beside each field, so convert measurements first when your source uses different units.