Insulation Calculator
Estimate insulation area, packages, approximate stud bays and material cost after door and window deductions.
Default project preview
617.1 ft²
Packages
16
Wall area
432 ft²
Ceiling area
180 ft²
Opening deductions
51 ft²
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Net area = wall area + selected ceiling area − openings. Order area = net area × waste factor. Packages = round up (order area ÷ package coverage).
FAQ
Insulation Calculator questions
Should doors and windows be subtracted?+
Yes for a closer material estimate, although small openings and cutting waste may partly offset each other.
Does area determine the correct R-value?+
No. R-value depends on climate, assembly type, cavity depth and energy code. This calculator estimates quantity only.
Why estimate stud bays?+
Approximate bay count helps when comparing batts sold by piece count, but framing layouts and corners vary.