Insulation Calculator
Work out how much insulation you need for a wall, ceiling or floor, and how many packs that is.
Insulation calculators
Insulation area, thickness and package counts for walls, ceilings and floors. Check the required thermal resistance for your climate and building code before fixing a thickness.
What you can calculate here
- Insulated area from room dimensions or a known coverage area.
- Insulation volume from area, thickness and number of layers.
- Pack or bale counts rounded up to what suppliers sell.
Insulation calculators
Insulation questions
What thickness of insulation do I need?
It depends on your climate zone and building regulations, not on the calculator. Use the required U-value or R-value from your local code, then enter that thickness here.
Should I add waste for insulation?
Yes. Batts and boards need cutting around studs, joists and services, so 5–10 % is a realistic allowance.