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Insulation Calculator

Work out how much insulation your attic, walls, or floor needs — R-value to add, inches of depth, and bags or bundles to buy — with DOE climate-zone targets, U.S. pricing, a material comparison, and a downloadable PDF.

Targets follow DOE climate zone recommendations. Bag and bundle coverage varies by brand — always check the label. Air seal before you insulate; insulation over unsealed gaps wastes most of its value. Estimates use 2024-2025 U.S. prices — for planning purposes only.

Area & Insulation
1 Area To Insulate
ft
×
ft
Attic floor footprint — measure the heated space below, not the roof slope.
sq ft
7%
Studs, joists, windows and doors are not insulated. Attic ~5-8%, walls ~15-20%.
2 R-Value Target
R-
Type over it if your code, rebate, or builder calls for something different.
Vermiculite can contain asbestos — have it tested, do not disturb it.
inches
Measure in a few spots with a ruler — old insulation settles and compresses.
3 Material & Cost
R-/ inch
Auto-set by material — check the bag, brands differ.
$/ bag
Blown fiberglass ~$38 - $50 per bag.
$total
Caulk, foam, baffles, attic hatch cover. DIY ~$100-300; pro ~$600-1,500.
$/ sq ft
Pro blown-in ~$1 - $2.50/sq ft. Set 0 for DIY (blower rental is often free with bags).
Insulation Estimate
Material To Buy
—
Enter the area to begin
R-Value To Add —
Net Area —
Depth To Add —
Full Cost Breakdown
Net area —
Insulation material —
TOTAL ESTIMATE—
Total cost / sq ft —
Finished R-value —
Install labor —
Cost Breakdown Chart
Estimated cost by category ($)
Material Comparison — Your Area
MaterialR / inchDepth NeededQuantityMaterial Cost

To add R-30 over 1,116 sq ft. Prices are typical U.S. retail — spray foam is normally quoted installed, not DIY.