Cement Calculator – Cement Bags for Concrete Slab Column Wall
Calculate exact cement bags needed for any concrete element. Uses dry volume factor 1.54 and cement density 1440 kg/m³.
Cement Formula
Dry Volume = Wet Volume × 1.54
Cement = Dry Vol × (1/Sum of Ratios) × 1440 / 50
M20 (1:1.5:3): Sum = 5.5 | Cement ratio = 1
5m × 4m × 0.15m slab, M20:
Wet Vol = 3 m³ | Dry Vol = 4.62 m³
Cement = 4.62 × (1/5.5) × 1440 / 50 ≈ 25 bags
Frequently Asked Questions
Approximately 8 bags (50kg each) per cubic metre of M20 concrete using the 1:1.5:3 mix ratio with a dry volume factor of 1.54.
The 1.54 factor accounts for voids in dry ingredients. The dry mix volume must be 1.54 times the wet concrete volume to get the right quantity.