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Concrete Quantity Calculator

Work out roughly how much concrete you need, then get a free estimate in one step.

Calculate your concrete volume

Volume = Length × Width × Thickness × Quantity

Estimated concrete required

0.00 m³

Includes 5% wastage allowance. Ready-mix is usually ordered in [0.5 m³] steps; we'll help you round up correctly.

Approximate only. Confirm quantities with your engineer before ordering.

Example: a typical house slab

A slab 10 m long, 8 m wide and 0.125 m (125 mm) thick needs 10 × 8 × 0.125 = 10 m³ of concrete. With a 5% wastage allowance, that's about 10.5 m³.

Estimate form

Get your free estimate

Your calculated quantity is filled in automatically. Change it if you need to, add your site details and we'll send you pricing and availability.

Disclaimer: Calculator results are approximate and for guidance only. Actual quantities depend on your drawings, formwork, site levels and wastage. Please confirm quantities with your engineer or contractor before ordering.

Free concrete pour checklist

Prepare your site, formwork and crew before the truck arrives.

Download Checklist

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FAQs

Quantity questions

Why add a wastage allowance?

Uneven ground, formwork deflection, spillage and pump priming use extra concrete. A small allowance avoids running short mid-pour.

Should I order a little extra?

It's usually safer to order slightly more than to stop a pour, which can create cold joints. Our team will help you choose the right quantity.

How much concrete does one transit mixer carry?

Our transit mixers carry up to [X m³] per load.

Know your quantity? Get your price.