INTERACTIVE TOOL
Concrete calculator
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How to use this tool
- Enter length and width in metres.
- Enter depth in centimetres.
- Add the waste allowance and review volume.
ModelVolume = length × width × thickness; then apply the selected allowance.
Worked example
Five by three metres with ten centimetres depth is 1.5 cubic metres; eight percent extra gives 1.62.
Assumptions and limits
This calculates rectangular volume, not structural design or concrete mix proportions.
Frequently asked questions
Is depth entered in centimetres?+
Yes. The result is shown in cubic metres and litres.
What happens to my inputs?+
Calculation inputs are processed locally in your browser. Favorites and preferences may be saved on this device. The site may perform separate network requests for live panels; these do not include the values entered into this local calculator. Do not paste secrets into public tools.
How should I check the result?+
This calculates rectangular volume, not structural design or concrete mix proportions.