Concrete Calculator

A concrete calculator determines the volume of concrete needed for slabs, footings, and columns, then converts that to bags of ready-mix or bulk quantities. Concrete is sold by the cubic metre (m³) in bulk or in bags (typically 25kg bags yield ~0

The calculator uses the standard published formula for concrete. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with kilograms, inches, percentages, watts. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: Volume (m³) = Length × Width × Depth (all in metres). Each step in the calculation is shown so you can verify the result manually.