Insulation · Project planning

Blown-In Insulation Calculator

Use both constraints from a manufacturer chart: maximum coverage per bag and minimum bags per 1,000 square feet. Keep installed and settled thickness distinct.

By Alish Gautam, Software Developer · Updated · Calculation methodology

Start with the editable example below. Dimensions retain their physical size when units change. Region sets currency labels without converting currencies; confirm entered quotes after changing region. Thermal inputs labeled US R retain that unit in every region.

Measured insulation surfaces

Use non-overlapping rectangles. Enter openings as area on the surface they interrupt.

Room / surface 1
Product settings
Product and system dimensions
Editable arithmetic example. Replace with your project or product specification.
Enter from the same product and target-R chart row as maximum coverage. This fixed chart unit does not change with the UI unit system.
Editable arithmetic example. Replace with your project or product specification.
Editable arithmetic example. Replace with your project or product specification.
Editable arithmetic example. Replace with your project or product specification.
Optional supplier product name, chart revision or quote reference, saved in shared project state.
Advanced settings
Advanced planning settings
Planning allowance, not a code or industry requirement. Set zero to order the exact rounded takeoff.
Cost settings · USD
Optional quote prices
Optional supplier quote in the selected currency. Blank omits cost.

Project takeoff

Whole packages round up. Allowance is separate from purchased surplus. Prices omit labor, delivery, tax and other items unless explicitly entered.

Gross measured area
120 ft²
Opening / exclusion deductions
0 ft²
Coverage-based bags
4
Minimum-density bags
4
Governing bags to buy
4
Installed depth
10 in
Settled depth
9 in
Total dry material weight
100 lb

Supplier-ready material list

Insulation bags
4
Geometry / layout breakdown
Dimensions use the selected measurement system.
SurfaceMaterialGross (ft²)Net (ft²)
Room / surface 1floor120120

All chart inputs must come from the same product and R-value row. The example values are editable arithmetic examples, not a named product profile.

How it works

Bags = max(ceil(planned area / maximum coverage), ceil(planned area / 1,000 × minimum bag density)).

Assumptions and limitations

All chart inputs must come from the same product and R-value row. The example values are editable arithmetic examples, not a named product profile.

Whole packages round upward after the chosen allowance. Physical geometry and purchase reserve are separate. Manufacturer and project specifications override editable examples; the selected region does not establish a local code requirement.

Sources and boundaries

Greenfiber: Documents and Downloads — Coverage Charts

Open the source · Current documents library · Reference checked 2026-10-04

Scope: Product-specific loose-fill documentation

Used for: Where to obtain coverage and minimum bag-density rows.

Does not establish: Fabricated coverage curves; Unverified legacy SANCTUARY data.

Use the current product document to verify numerical inputs. The legacy Rev D PDF redirects to this library. No named Greenfiber profile is published from the stale search snippet; enter the current chart row.

Owens Corning: AttiCat Insulation

Open the source · Product page · Reference checked 2026-10-04

Scope: Selected loose-fill insulation product

Used for: Product documentation lookup.

Does not establish: Unverified bag-yield presets.

Use the current product document to verify numerical inputs. No coverage row is stored without a directly verified chart.