Insulation Rolls Calculator
Count insulation rolls for an area, with a waste allowance.
Quick answer: enter your details below and click Count Rolls — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Measure the area in square metres.
- Enter the coverage of one roll.
- Click Count Rolls.
About this tool
Enter the area to insulate and the coverage of one roll, and the tool adds a 10 percent allowance for trimming around joists, pipes, and edges before rounding up. The allowance is shown separately from the exact roll count.
Frequently asked questions
Does roll width matter?
Yes, matching roll width to joist spacing reduces cutting and waste.
What about double layers?
Double the area figure first if you plan two layers, then apply the allowance.