Self-Leveling Underlayment Volume and Bag Calculator

Range: 1–100,000 ft2

Range: 0.01–12 in

Estimate from a depth survey/grid; a single average can understate local high spots. Confirm this thickness and substrate are allowed for the selected product.

Range: 0.001–10 ft3

Enter the selected product’s approximate yield in cubic feet per bag. Concrete-system example only: ARDEX K 40 Rapid product data lists 56 ft2 per 50 lb bag at 1/8 in (about 0.58333 ft3 by geometry); default rounds slightly upward. Its listed substrate and 1/8-1 in limits are product-specific; coverage varies with substrate texture. Verify suitability for the wood-floor assembly.

Range: 0–40 %

Optional estimating allowance for surface variation and jobsite loss; not a standard or a substitute for a depth survey.