When to use it
Use it when you need a clear result without building a manual formula or spreadsheet.
Instant calculator
Concrete Volume Calculator
Estimate concrete volume for a rectangular slab or footing from length, width, and thickness, with unit and waste notes.
FreeInstant calculator
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Input data
Enter the required values, then run the tool.OUTPUT
Result
Ready◇Your result will appear here
Complete the form and run the tool to see the result.
Usage guide
Use the tool with confidence
Enter the required data, review the result, then copy or export it as an image or PDF depending on the tool.How it works
Enter values, run the tool, then review the result and supporting details.
Note
Review the figures and context before making financial or business decisions.
Estimating concrete volume
This calculator finds the geometric volume of a rectangular concrete element such as a slab or footing from its length, width, and thickness. The result is in cubic metres when every dimension is entered in metres.
Inputs and field meanings
Review these values before running the tool. The labels below come from the actual form so the guidance matches what you will use on this page.
- Length in meters: required, minimum 0.
- Width in meters: required, minimum 0.
- Depth in meters: required, minimum 0.
Volume formula
Concrete volume = length × width × thickness or depth.
Convert centimetres to metres before multiplying. For example, 15 cm = 0.15 m.
Slab example
A slab 6 m long, 4 m wide, and 0.15 m thick has a theoretical volume of 6 × 4 × 0.15 = 3.6 m³.
Before ordering concrete
- Check units carefully, especially thickness values commonly measured in centimetres.
- The result does not automatically include spillage, excavation variation, or waste allowance.
- Irregular shapes should be split into simpler sections or calculated with the correct geometry for each section.
Concrete estimate questions
Should I add a waste allowance?
The calculator returns geometric volume only. Any contingency depends on the project and should be confirmed with the contractor or supplier.
How do I enter a 20 cm slab?
Use 0.20 m when the other dimensions are in metres.
Can this calculate a round column?
Not directly. A round column uses the cylinder formula πr²h.