What density should I use?
Use the specified or measured density for your mix; the calculator does not impose one universal value.
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Concrete Weight Calculator — Volume, Density & Total Mass
Calculate concrete volume and estimated weight from slab dimensions and an editable density instead of assuming one universal mix weight.
Result
300 kg
3 m³ volume
0.3 metric tonnes at 100 kg/m³ density
Formula and worked example
volume=L×W×T; mass=volume×density.
A 4 m × 3 m × 0.1 m slab is 1.2 m³; at 2,400 kg/m³ it weighs about 2,880 kg.
Assumptions
- Density is editable because concrete mixes vary.
- Dimensions describe a rectangular prism.
Last updated: 2026-09-16
Frequently asked questions
Is this structural design?
No. It is a geometry-and-density mass estimate.