Concrete Calculator
Concrete volume and cement/sand/aggregate estimate.
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About this calculator
Site-mixed concrete needs more dry material than the wet volume suggests because aggregates settle. The 1.54 factor accounts for that plus compaction.
Formula
Volume = L×W×T; dry volume = wet×1.54; cement share = dry×cement_ratio/total.
Frequently Asked Questions
How many bags for 1 m³ M20?
Roughly 8 bags of 50kg cement per cubic metre of M20 concrete.