Formula and calculation method
Volume = length × width × depth × (1 + allowance). Mass = volume in m³ × bulk density.
Rectangular coverage; density and allowance are user-editable. Actual compaction and product properties differ.
How to use concrete calculator
- Set Length. The example below uses 5.
- Set Width. The example below uses 3.
- Set Depth. The example below uses 0.1.
- Set Length units by choosing the option that matches your calculation.
- Set Extra allowance (%). The example below uses 10.
- Set Bulk density (kg/m³). The example below uses 2400.
- Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.
Worked example
Example inputs
- Length
- 5
- Width
- 3
- Depth
- 0.1
- Length units
- Meters
- Extra allowance (%)
- 10
- Bulk density (kg/m³)
- 2400
- Volume (m³)
- 1.65
- Volume (cubic yards)
- 2.15811852
- Estimated mass (kg)
- 3,960
Inputs and results explained
Concrete Calculator takes 6 inputs. Fill each one using the same units and conventions, then select Calculate.
- Length: a number of 0 or more. The worked example uses 5.
- Width: a number of 0 or more. The worked example uses 3.
- Depth: a number of 0 or more. The worked example uses 0.1.
- Length units: choose one of 2 options, such as Meters, Feet.
- Extra allowance (%): a number from 0 to 100. The worked example uses 10.
- Bulk density (kg/m³): a number of 0 or more. The worked example uses 2400.
The result panel reports Volume (m³), Volume (cubic yards) and Estimated mass (kg), so you can see the whole outcome rather than a single figure.
Factors affecting your result
Rectangular coverage; density and allowance are user-editable. Actual compaction and product properties differ.
Changing length changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.
Frequently asked questions
How does the concrete calculator work?
Volume = length × width × depth × (1 + allowance). Mass = volume in m³ × bulk density.
What inputs does Concrete Calculator need?
Enter length, width, depth, length units, extra allowance (%), bulk density (kg/m³). Read the unit labels; percentages are entered as ordinary percentages, not decimal fractions.
How should I interpret the concrete calculator result?
Rectangular coverage; density and allowance are user-editable. Actual compaction and product properties differ.
Are my concrete calculator inputs uploaded?
No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.
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