Inputs
Mix 5:1
×
Typical semi-dry screed 1.30–1.40
:
Liters water = w/c × kg of cement
Results
Wet volume
— m³
Dry mix volume
— m³
| Component | Volume (m³) | Mass (kg) | Packages |
|---|---|---|---|
| Cement | — | — | — bags |
| Sand | — | — | — bulk-bags |
| Water | — | — L | — |
Assumptions: densities are bulk values; packaging rounds up. Water need varies with moisture and admixtures.
Example Data
| Area (m²) | Thickness (mm) | Wet volume (m³) | Cement (kg) | Sand (kg) | Water (L) |
|---|---|---|---|---|---|
| 20 | 50 | — | — | — | — |
| 35 | 75 | — | — | — | — |
| 50 | 40 | — | — | — | — |
Formula Used
- Area A in m² from length × width (or entered directly).
- Thickness t in m → t = thickness_mm / 1000.
- Wet volume Vwet = A × t; add wastage: Vwet,adj = Vwet × (1 + w/100).
- Dry mix volume Vdry = Vwet,adj × Y (yield multiplier).
- Total parts P = sand_parts + cement_parts.
- Component volumes: Vcement = Vdry × cement_parts/P, Vsand = Vdry × sand_parts/P.
- Masses: m = ρ × V using bulk densities (kg/m³).
- Water demand (liters): W = w/c × mcement (1 L ≈ 1 kg water).
Note: Semi-dry screed compaction affects yield; adjust densities and yield to match local materials.
How to Use
- Choose units and area entry mode, then enter dimensions or area.
- Set thickness, wastage, yield, and confirm 5:1 mix parts.
- Review densities, packaging sizes, and optional cost fields.
- Click Calculate to see volumes, masses, and packages.
- Export as CSV or PDF; tweak inputs to explore scenarios.
FAQs
Semi-dry screeds often use 1.30–1.40 to convert wet volume to dry mix volume. Trial a small batch with your sand to refine this factor.
Densities are bulk: cement ~1440 kg/m³, sand ~1600 kg/m³. Moisture, grading, and packing alter actual values; adjust to your supplier data.
Enter a percentage to cover spillage and cuts. The calculator inflates the wet volume before converting to dry mix quantities.
Semi-dry screeds usually target a workable, low slump; 0.40–0.50 is typical. Moist sand reduces added water. Confirm with site trials and specifications.
Cement bags and sand bulk-bags round up to whole packages. Consider pallet or delivery constraints and check local supplier pack sizes.