Project guide
How much concrete do you need for a slab?
A concrete slab is calculated from length, width and thickness. This page helps estimate cubic metres before requesting a quote.
Concrete slab formula
Volume is calculated as length × width × thickness. All dimensions must be converted to the same unit, then the result is expressed in cubic metres.
What thickness should you allow?
Thickness depends on use, soil, formwork and project requirements. For structural work or projects with drawings, always follow your professional guidance.
Why add an allowance?
An allowance can cover small depth variations, waste and site irregularities. The calculator lets you choose 0%, 5%, 10% or 15% depending on uncertainty.
Useful information for a quote
Provide the address, desired date, dimensions, site access and constraints such as backyard access, long distance or possible pumping needs.
Have the project details?
Send a request with the approximate quantity, desired date and site access.