Concrete Calculator
Enter slab, beam, column or footing dimensions to get the concrete volume you need and the cement, sand and aggregate quantities — so you can order materials accurately and avoid costly shortages or waste on site.
How to use
- Enter the length, width and depth (in inches) of the slab, beam or footing.
- Enter the mix ratio — M15 = 1:2:4, M20 = 1:1.5:3, M25 = 1:1:2.
- Enter the wastage.
- The full breakdown of cement bags, sand, crush and water will appear.
Note: The standard 1.54 factor is used for dry volume. This is based on a 50 kg cement bag and a density of 1440 kg per m3. For structural work, always follow the design mix of your engineer. Rates change — verify with the official source before relying on this.
Tips
- The tool uses the standard 1.54 dry-volume factor — standard practice in the region.
- Order a little extra concrete; running short mid-pour is worse than leftover.
- For structural slabs and beams, always follow your engineer's design mix.
- Cement bags lose strength if stored damp — buy close to the pour date.
Frequently Asked Questions (FAQ)
What does the Concrete Calculator calculate?
Concrete volume and material quantities for slabs, beams, columns and footings, plus the cement bags needed.
What assumptions does it use?
The standard 1.54 factor for dry volume, a 50 kg cement bag, and a density of 1440 kg per m3.
Can I change the mix ratio?
Yes. The cement, sand and aggregate parts are editable, and the defaults follow the M15 ratio of 1:2:4.
Can I use it for structural work?
For structural work, always follow the design mix of your engineer — this is an estimate.