ClarityHow to use this tool
- Enter area, installed depth, installed density, mass per bag.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
The method, explained
Required mass = area × depth in metres × installed density. Bags = ceiling(mass/bag mass).
Using area = 100 m², installed depth = 250 mm, installed density = 25 kg/m³, mass per bag = 12 kg, the result is 53 bags. Change these example inputs to match your task; use the method above to check each step.
Understanding your result
Use manufacturer installed density and settled-depth guidance. Does not predict R-value or account automatically for settling.
What to keep in mind
Use manufacturer installed density and settled-depth guidance. Does not predict R-value or account automatically for settling. A material-quantity estimate, not a structural design or building-code check. Confirm site measurements, supplier coverage and waste before ordering.
Common questions
How do I use this blown insulation bag calculator?
Estimate loose-fill insulation bags from volume, installed density and bag mass. Enter area in m², installed depth in mm, installed density in kg/m³, mass per bag in kg. The starting example is editable; use values for the same system or project.
Which assumptions affect this result?
Use manufacturer installed density and settled-depth guidance. Does not predict R-value or account automatically for settling.
Methodology maintained by ClarityKit. How these tools are built and checked.