BUILDING & PLANNING · DENSITY CALCULATOR
Ordinary Portland cement weighs 1,440 kg/m³ (14.1 kN/m³) by IS 875, and rapid-hardening cement 1,280 kg/m³. A 50 kg bag is therefore 50 ÷ 1,440 = 0.0347 m³, about 1.23 ft³. Cement mortar and cement plaster weigh 2,080 kg/m³ (20.4 kN/m³).
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| Unit weight | 14.12 kN/m³ |
| Density | 1.440 g/cm³ (t/m³) |
| Density | 89.9 lb/ft³ |
| Mass in tonnes | 1.440 t |
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From IS 875 (Part 1):1987 Table 1.
| Material | Unit weight | Density |
|---|---|---|
| Cement, ordinary and aluminous | 14.10 kN/m³ | 1,440 kg/m³ |
| Cement, rapid-hardening | 12.55 kN/m³ | 1,280 kg/m³ |
| Cement mortar | 20.40 kN/m³ | 2,080 kg/m³ |
| Cement plaster | 20.40 kN/m³ | 2,080 kg/m³ |
To convert: kN/m³ = kg/m³ × 9.81 ÷ 1,000; lb/ft³ = kg/m³ × 0.0624.
The weight of 2.5 m³ of cement:
0.0347 m³ (34.7 litres, about 1.23 ft³), from 50 kg ÷ 1,440 kg/m³. This is the figure used to turn cement volume into bags.
No. It is the bulk density of loose cement, including the air between grains, which is what matters for measuring by volume. The particles themselves are about 3,150 kg/m³.
About 90 lb/ft³: 1,440 kg/m³ × 0.0624 = 89.9 lb/ft³. A 94 lb US bag is close to 1 ft³.
