Work out cement bags, sand, aggregate and water for a concrete volume and mix ratio such as 1:1.5:3 (M20) or 1:2:4 (M15), from dimensions or volume.
About this tool
Work out cement, sand and aggregate quantities for a concrete mix ratio.
How to use Cement Calculator
- Enter the dimensions or the volume of concrete.
- Choose the mix ratio for the job.
- Read the cement bags, sand, aggregate and water.
Worked example
One cubic meter of M20 (1:1.5:3) concrete needs about 8 bags of 50 kg cement, 0.42 m³ of sand and 0.84 m³ of aggregate.
Why multiply by 1.54?
Dry materials shrink when water is added and voids fill, so about 54% more dry volume is needed.
Which mix should I use?
M20 (1:1.5:3) suits slabs and beams, M15 (1:2:4) general work and 1:3:6 foundations and floors.
- Cement Calculator — Work out cement, sand and aggregate quantities for a concrete mix ratio.
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