Concrete Calculator UK
Our free UK concrete calculator estimates the volume of concrete you need for slabs, footings, columns, and other construction projects. Simply enter your project dimensions to get an instant cubic metre figure ready to order from a UK supplier.
Volume Required
Net Volume
1.50 m³
20kg Bags
~83
Standard 20kg bags of pre-mixed concrete typically yield about 0.01m³. We recommend a 10% waste allowance for spills and uneven ground.
How Concrete Volume Is Estimated for UK Projects
This calculator estimates the volume of concrete required for rectangular slabs, footings, and columns. Formula: Volume (m³) = Length × Width × Depth (all in metres). A 10% waste factor is added automatically. Inputs: shape type, and the relevant dimensions in metres or centimetres. Outputs: required volume in cubic metres, approximate weight in tonnes, and the number of standard 25kg bags of ready-mix concrete required.
Frequently Asked Questions
How does the UK Concrete Calculator work?
Our UK concrete calculator calculates material quantities using standard construction formulas and UK building specifications. Enter your project dimensions and get an instant materials estimate, including a standard waste allowance.
Does this Concrete Calculator include a waste factor for UK building projects?
Yes. Our concrete calculator automatically includes a 10% waste factor in all material estimates, in line with standard UK building industry practice. This helps ensure you order enough materials without significant overspend.
Can this Concrete Calculator be used for both DIY and professional projects in the UK?
Yes. Our concrete calculator is designed for both UK DIY enthusiasts and professional builders and contractors. Results are accurate enough for ordering estimates and project planning, though on-site conditions may require adjustment.
Does the Concrete Calculator work for UK metric measurements?
Yes. Our concrete calculator works in metric units (metres, centimetres, cubic metres, kilograms) as standard — consistent with UK building regulations and supplier specifications. Imperial measurements are also supported where relevant.
Is this UK Concrete Calculator free to use?
Yes. Our concrete calculator is completely free to use on any device with no account or registration required. Use it to plan your UK building project quickly and accurately before visiting a builder's merchant or placing orders.