Concrete slab volume calculator UK
Calculate a rectangular slab’s concrete volume from metres and millimetres. Check the formula, worked example and limits before using your own figures.
Enter your figures
Concrete volume including allowance
Inputs changed. Select Calculate result to update your estimate.
Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. Quantity arithmetic only, not structural design, mix specification or ground preparation advice. Depth and allowance must be appropriate to the project.
How the concrete slab volume calculator uk works
Base volume = length × width × depth/1,000. Add selected volume allowance.
Data basis: mathematical formula using your inputs. Example prices and rates are illustrative, not current market quotes.
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Worked example: concrete slab volume
This illustration uses the calculator’s example inputs. It is not a quote or a recommended financial decision.
- Slab length (m)
- 5
- Slab width (m)
- 3
- Slab depth (mm)
- 100
- Chosen volume allowance (%)
- 5
Concrete volume including allowance: 1.58 m³
Base volume = length × width × depth/1,000. Add selected volume allowance.
Concrete slab volume: questions answered
What does the concrete slab volume calculation include?
Base volume = length × width × depth/1,000. Add selected volume allowance. Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. Quantity arithmetic only, not structural design, mix specification or ground preparation advice. Depth and allowance must be appropriate to the project.
Using your result
Example inputs are a starting point. Replace them with your figures and select Calculate result. Results are rounded for display; calculations use unrounded values.
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