About this calculator
Estimate insulation area and pack count using pack coverage.
Use the exact coverage printed for the insulation thickness you are buying.
Formula
Required area = length × width × (1 + waste%). Packs = required area ÷ pack coverage, rounded up.
Example
10m × 5m = 50m² before waste.
Accuracy
NUMTX shows the assumptions next to the calculation so you can replace defaults with values that match your situation. For measurements, supplier rates, fees, interest, tax or regulated work, confirm important figures with the appropriate official or professional source.