How Much Underlayment Do You Need?
Underlayment normally covers the same floor area as the installed flooring, plus overlap and cutting allowance. Enter the coverage supplied by one roll or package.
Verify Compatibility
Confirm the flooring manufacturer permits the selected underlayment and check requirements for vapor barriers, seams, thickness, and subfloor type.
Calculation Standards
This tool uses documented formulas and high-precision internal values. Displayed results may be rounded for readability. Review the assumptions and verify important decisions with a qualified professional.
Read our calculation methodology