What is the Concrete Calculator?
Calculate the cement, sand and stone chips needed for a concrete slab, beam or column.
Enter length, width, thickness and mix ratio and the Concrete Calculator returns cement, sand, stone or brick chips, wet volume and wet volume in cubic metres. Results update as you type, and nothing you enter leaves your device.
How it is calculated
Wet volume = length × width × thickness
Dry volume = wet volume × 1.54, shared between cement, sand and aggregate by the mix ratio
How to use it
- Enter length in ft.
- Enter width in ft.
- Enter thickness in inches.
- Choose mix ratio.
- Read cement in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Concrete Calculator use?
It uses: Wet volume = length × width × thickness; Dry volume = wet volume × 1.54, shared between cement, sand and aggregate by the mix ratio.
What do I need to use the Concrete Calculator?
You need length, width, thickness and mix ratio. Sensible starting values are filled in so you can see how it works straight away.
Is the Concrete Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.