Underlayment Calculator

Estimate the underlayment material needed for your flooring installation. Enter room dimensions and overlap to compare rolls or sheets needed and total cost for foam, cork, and plywood underlayment options.

Room Length (ft)

Room Width (ft)

Overlap (inches)

Waste Factor (%)

Pricing (edit to match local rates)

Foam Basic ($/roll)

Foam+Moisture ($/roll)

Cork ($/roll)

Plywood 1/4" ($/sheet)

Seam Tape ($/roll)

Total Coverage Needed

207 sq ft

180 sq ft base + overlap & waste

Best Value

Foam (Basic)

3 rolls

Lowest Total Cost

$91.00

incl. seam tape

Underlayment Type	Material Needed	Total Cost
Foam (Basic)Best value	3 rolls (100 sq ft/roll) + 2 tape	$91.00
Foam + Moisture Barrier	3 rolls (100 sq ft/roll) + 2 tape	$136.00
Cork Underlayment	9 rolls (25 sq ft/roll) + 2 tape	$331.00
Plywood 1/4"	7 sheets (4x8 ft sheets)	$126.00

Recommended: Foam (Basic) at $91.00For 180 sq ft of floor area (with 6" overlap and 10% waste), Foam (Basic) provides the lowest total material cost. Lay underlayment perpendicular to the flooring direction and tape all seams to prevent moisture and sound transmission.

Material quantities are estimates based on standard roll/sheet sizes and typical overlap and waste factors. Actual needs vary by room layout, subfloor condition, and flooring type. Always consult manufacturer guidelines for your specific flooring product. Prices are approximate and vary by region.