Cement calculator
Work out how many 50 kg bags of cement, and how much sand and granite, you need for plastering, floor screeding or concrete work.
Free, no sign-upRuns in your browser
Change the assumptions
You need
Cement0 bags50 kg bags
Sand0 t0 m³
Granite0 t0 m³
Wet volume0 m³dry materials 0 m³
Dry materials = wet volume × 1.33 for mortar. One 50 kg bag of cement is about 0.0347 m³.
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Why is the dry volume bigger than the area times thickness?
Wet mortar and concrete shrink as the gaps between grains fill. Builders multiply by about 1.33 for mortar and 1.54 for concrete to get the dry materials needed.
Is it free?
Yes. This tool is free to use, with no sign-up.
Is what I type stored?
No. Everything happens in your browser and nothing is sent to our servers.
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