Cement Calculator

The Cement Calculator helps you estimate how much cement you need for a concrete project. Enter your slab, floor, footing or other concrete dimensions, choose your mix ratio and bag size, and get an estimate of cement bags, sand, aggregate and material costs. You can also change measurement units and currency to suit your project.

Currency & Measurement Units

Currency / Country

Changing country updates the currency symbol and example prices. Check local prices before buying.

Dimension Unit

Concrete Dimensions

Length

Width

Thickness / Depth

For a slab, enter its thickness. For a footing or beam, enter its depth.

Extra Material / Wastage (%)

Adds a percentage to the concrete volume to allow for waste.

Concrete Mix & Cement Bags

Concrete Mix Ratio

Use the mix specified by your engineer or project requirements.

Cement Bag Size

The estimate uses a dry-volume factor of 1.54 and an approximate cement density of 1,440 kg/m³. Actual mix design and material requirements can vary.

Material Prices

Price per Cement Bag ($)

Sand Price per m³ ($)

Aggregate Price per m³ ($)

Prices are editable examples, not live market rates. Enter prices from your local supplier for a more useful estimate.

Your Cement Estimate

Cement Bags to Purchase —

Concrete Volume (with wastage) —

Estimated Dry Volume —

Cement Required —

Cement Volume —

Sand Required —

Aggregate Required —

Estimated Cement Cost —

Estimated Sand Cost —

Estimated Aggregate Cost —

Estimated Total Material Cost —

This calculator provides an approximate planning estimate for a rectangular concrete section. It does not replace a structural engineer’s mix design or advice. Labour, transport, formwork, reinforcement, taxes and other site costs are excluded. Confirm material quantities and concrete strength requirements before construction.

How to Use the Cement Calculator

Enter the length, width and thickness or depth of your concrete section.
Select your measurement unit and the concrete mix ratio.
Choose the cement bag size and enter local prices for cement, sand and aggregate.
The calculator will estimate the cement bags required, material quantities and total material cost automatically.

Example

Suppose you need concrete for a slab measuring 5 metres long, 4 metres wide and 0.1 metres thick, using a 1:2:4 mix ratio with 5% extra material.

The calculator estimates the concrete volume, cement bags, sand and aggregate required, along with the approximate material cost based on your entered prices.

Note: This calculator provides an approximate estimate for planning purposes. Actual material requirements depend on the concrete mix design, material properties, site conditions and construction method. Confirm the required mix and quantities with a qualified professional before starting construction.