Insulation Calculator

This insulation calculator estimates the coverage and cost to insulate a wall, floor, or attic. We multiply length by width to get the area you need to cover, then multiply by an average price for the R-value you select.

Higher R-values insulate better and cost more per square foot. The estimate covers batt or roll insulation material only — wall cavities take R-13 to R-19, while attics often need R-30 to R-38 depending on climate.

Measure the actual surface you're insulating (not the room volume). For attics, measure the floor area you'll cover.