Standards-compliant calculators for insulation installers in NZ & Australia. Free, no signup required. Works on mobile.
Each calculator opens on its own page — bookmark the ones you use most.
R-value from material and thickness. NZS 4218 pass/fail for ceiling, wall and floor by climate zone.
How many batts or rolls for any area. Glasswool, polyester and underfloor batts with waste allowance.
Annual kWh savings, dollar savings and payback period for upgrading insulation. 8 NZ and AU cities.