Concrete Mix Calculator.
Estimate cement bags, sand and aggregate volumes for a simple site-mixed concrete ratio.
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Instant Results
Cement bags
12.7bags
Estimated cement bags.
Sand
0.44m3
Estimated dry sand volume.
Aggregate
0.88m3
Estimated dry aggregate volume.
Explanation
What this calculates
A dry-volume factor is applied before dividing the material quantities by the selected mix parts.
Formula
Dry volume = wet volume x 1.54; split dry volume by mix ratio
Inputs are validated on screen and converted where unit options are available.
Worked Example
Example result
For 1 m3 at 1:2:4, expect roughly 12.7 x 25 kg cement bags, 0.44 m3 sand and 0.88 m3 aggregate.
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Templates
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Software
Turn it into a workflow
Learn before you act.
More related articles are planned for this section.
Calculator questions.
Is 1.54 always correct?
It is an estimating factor for dry ingredients. Follow supplier and engineer requirements for actual works.
Can I use ready-mix instead?
For many structural pours, ready-mix with a specified grade is the safer procurement route.
Next Step
Make estimates part of the job record.
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