Construction
Drywall sheets
Estimate drywall sheets for walls after openings and waste.
Calculators / Construction / Insulation material
Insulation material calculator
Estimate insulation packs from surface area, openings, and pack coverage.
On this page
Net area27.4m²
Area including waste28.77m²
Packs required4packs
Calculator controls
How to calculate
Estimate insulation packs from surface area, openings, and pack coverage.
packs = ceil((gross area − openings) × waste factor ÷ pack coverage)
Worked example
Surface length (m): 12; Surface height (m): 2.7; Openings area (m²): 5; Coverage per pack (m²): 8; Waste allowance (%): 5.
Net area: 27.4 m²; Area including waste: 28.77 m²; Packs required: 4 packs.
Assumptions and limits
Thermal rating, framing spacing, compression, moisture control, multiple layers, and local codes are not determined here.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate insulation packs from surface area, openings, and pack coverage. Every assumption remains visible so the result can be checked or changed.
When this tool is useful
Use the insulation material for an initial estimate, comparison, or classroom calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Surface length (m) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Surface height (m) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Openings area (m²) | Enter a number of at least 0 and no more than 1000000000000. |
| Coverage per pack (m²) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Waste allowance (%) | Enter a number of at least 0 and no more than 100. |
Frequently asked questions
What are the limits of this insulation material?
Thermal rating, framing spacing, compression, moisture control, multiple layers, and local codes are not determined here.
Can I use different units?
Use the units printed beside each field. Convert measurements first when your source uses different units.