Floor Leveling Compound Volume Calculator
Calculate the volume and weight of self-leveling compound required to level a floor area to a specified depth.
Typical self-leveling compound: 90–110 lb/ft³ when mixed
Formula
Net Volume (ft³) = Length (ft) × Width (ft) × Depth (ft)
Volume with Waste (ft³) = Net Volume × (1 + Waste% / 100)
Weight (lb) = Volume with Waste (ft³) × Density (lb/ft³)
Bags Needed = ⌈ Weight (lb) ÷ Bag Size (lb) ⌉ (ceiling — always round up)
Unit conversions used:
1 ft = 12 in = 30.48 cm = 304.8 mm = 0.3048 m
1 ft³ = 1/27 yd³ = 0.028317 m³ = 28.317 L = 7.4805 US gal
1 lb = 0.453592 kg
Assumptions & References
- The floor area is treated as a simple rectangle (Length × Width). For irregular rooms, calculate each rectangular section separately and sum the results.
- The "depth" is the average pour depth across the entire area. Uneven floors may require more material in low spots.
- Default mixed density of 100 lb/ft³ is representative of common Portland-cement-based self-leveling compounds (e.g., Ardex, Mapei, Henry). Check your product's technical data sheet for the exact value.
- A 10% waste/overage factor is the industry-standard recommendation to account for spillage, uneven application, and edge losses (TCNA Handbook).
- Minimum recommended pour depth for most self-leveling compounds is 1/8 in (3 mm); maximum single-pour depth varies by product (typically 1–2 in). Consult manufacturer guidelines for deep fills.
- Weight calculation assumes the compound is used as a mixed/wet product. Dry powder bags yield approximately the same volume when mixed per manufacturer water ratios.
- Bags are always rounded up (ceiling function) to ensure you purchase enough material.
- References: ASTM C1708 (Self-Leveling Mortars), TCNA Handbook for Ceramic, Glass, and Stone Tile Installation, manufacturer TDS for Ardex K-15, Mapei Ultraplan, and Henry 555.