Floor Screed Calculator
Calculate the cement and sand required for floor screeding. Supports custom mix ratios (1:3 to 1:5) and screed thickness for perfect floor leveling.
About
A floor screed is a semi-dry cementitious mixture used to level a concrete subfloor prior to installing tile, wood, or other finish floorings. Unlike structural concrete, screed has a much lower water content (consistency of damp earth) and uses sharp sand (no large aggregates). Getting the quantity right is tricky because the mix compacts significantly.
This calculator determines the precise amount of Ordinary Portland Cement (OPC) and Sharp Sand needed based on your specific mix ratio. Standard industry practice typically suggests a 1:4 cement-to-sand ratio for a strong, reliable bed. This tool is essential for tilers, bathroom fitters, and DIY renovators ensuring their substrate is perfectly flat and durable.
Formulas
The calculator assumes a compacted dry density of approximately 2,200 kg/m³. The logic sums the total mass required and splits it according to the weight ratio.
Total mass including 10% waste factor:
Material breakdown based on ratio (e.g., 1:4):
Reference Data
| Mix Ratio | Cement (Parts) | Sand (Parts) | Typical Application |
|---|---|---|---|
| 1 : 3 | 1 | 3 | High traffic, heavy-duty bonding |
| 1 : 4 | 1 | 4 | Standard domestic floor screed |
| 1 : 5 | 1 | 5 | Light duty or thicker non-structural beds |
| Dry Density | Approx. 2,200 kg/m³ | Fully compacted state | |
| Coverage | ~20 kg per m² @ 10mm thickness | General estimation | |