About Concrete Calculator UK

Concrete Calculator UK is a free tool site built for anyone working with concrete in the UK. Whether you're laying a garden slab, pouring footings for an extension, or pricing up a kerb run, the calculators here give you the volumes and bag counts you need before you order materials.

Getting concrete quantities wrong costs money. Over-order and you're paying to dispose of the excess. Under-order and you're making a second trip to the builders' merchant, or worse, ending up with a cold joint. These calculators are designed to get you close to the right number first time, using metric units and the standard UK bag sizes you'll find at any supplier.

Every calculator on this site is free to use with no sign-up required. Your dimensions stay in your browser and nothing gets sent to a server. The tools cover slabs, columns, stairs, footings, and kerbs, each with a visual preview so you can check your inputs look right before reading off the result.

If you spot a bug, have a suggestion for a new calculator, or want to flag a content error, drop us a line at privacy@concretecalculator.uk.