Work out the concrete volume and the cement bags, sand and aggregate needed for a slab, floor or footing, for common nominal mixes.
loading toolHow to use the concrete calculator
- Type your numbers in the boxes (pick your currency or units if asked).
- The answer updates as you type: no button to press.
- Copy the result, or share it on WhatsApp with one tap.
Questions
Why multiply by 1.54?
Dry materials shrink by about a third when mixed with water, so about 1.54 m³ of dry material makes 1 m³ of concrete.
Is my data private?
Yes. Everything happens inside your own browser: nothing you type or choose is uploaded to us or anyone else.
Is it free?
Completely free, with no sign-up, no watermark and no limit on how many times you use it. Light ads keep the site running.
