Self-Leveling Floor Compound Calculator
Estimate the exact number of bags required for your flooring project. Calculates based on area, average thickness, and specific product density.
About
Self-leveling underlayment (SLU) is expensive and time-sensitive. Running out of material mid-pour results in cold joints and uneven surfaces, while over-ordering wastes budget and heavy lifting effort. This tool calculates the required dry powder weight based on the volume of the space and the specific density of the cured product.
Uneven subfloors rarely have a uniform thickness requirement. We recommend taking measurements at multiple spots (high points and low points) to determine a realistic Average Thickness. Most manufacturers specify consumption rates in kg/mm/m2. This calculator defaults to the industry standard of 1.6 but allows customization for specific brands like Mapei, Sika, or Ardex.
Formulas
The calculation determines the volume and converts it to mass based on dry powder density.
Volume:
V = Area × AvgThickness
Required Mass:
Mass = V × ConsumptionRate
Total Bags:
Bags = ceilMassBagWeight
We add a standard 5% wastage factor to the final calculation.
Reference Data
| Brand / Product | Density (kg/L or kg/mm/m²) | Water Ratio (Approx) |
|---|---|---|
| Generic Standard | 1.60 | 5.0 - 6.0 L |
| Mapei Ultraplan 1 Plus | 1.60 | 5.7 L |
| Sika Level-125 | 1.50 | 4.0 L |
| Custom Building Products | 1.70 | 5.2 L |
| Quikrete Self-Leveling | 1.80 | 4.7 L |
| Ardex K 15 | 1.40 | 6.5 L |