Free screed (Estrich) calculator: how much cement or flow screed you need — volume in m³, total kg and number of bags from area and thickness.
Reference for cement screed (~20 kg per m² and per cm; density ~2000 kg/m³):
| Thickness | Material | Volume |
|---|---|---|
| 3 cm | ~60 kg/m² | 0.03 m³/m² |
| 4 cm | ~80 kg/m² | 0.04 m³/m² |
| 5 cm | ~100 kg/m² | 0.05 m³/m² |
| 6 cm | ~120 kg/m² | 0.06 m³/m² |
| 8 cm | ~160 kg/m² | 0.08 m³/m² |
Volume (m³) = area × thickness. Material (kg) = area × thickness (cm) × ~20 kg. Bags = material ÷ bag size (rounded up).
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Cement screed weighs about 20 kg per m² and per cm of thickness (density ~2000 kg/m³). For 5 cm that is ~100 kg/m². Multiply by your area and divide by the bag size.
Volume (m³) = area (m²) × thickness (m). For 20 m² at 5 cm: 20 × 0.05 = 1.0 m³.
Bonded screed from ~2.5 cm, screed on a separating layer ~3.5 cm, and floating screed (on insulation) usually 4-7 cm depending on the load.