Sigma Build

Concrete calculator

How much concrete do you need? Enter each slab, path or footing and get the volume to order and the number of bags for small pours.

You need about

2.52 m³ of concrete

Area: 24.0 m²
Premix bags (20 kg): 271

At this volume, ready-mix from a concrete supplier is usually cheaper and faster than bags.

Rules of thumb, not a measured takeoff. Check product coverage with your supplier.

Pricing the whole job?

Send us the plans. Sigma Build measures every slab, footing and thickening from your drawings and prices the job at your rates. 2 free houses every month.

Send your plans

How it is worked out

Volume is length times width times thickness for each slab, plus your waste allowance for uneven ground and spillage. The bag count assumes about 108 bags of 20 kg for each m³ of concrete.

How our concrete takeoff service works →

Common questions

How much extra concrete should I order?

Add 5% for a level, formed slab and 10% where the ground is uneven or the edges are dug rather than formed. Running short mid-pour costs far more than a little left over.

Can you measure the concrete from my plans?

Yes. Send the PDF plans and Sigma Build measures slabs, thickenings and footings from the drawings and prices the job at your rates. Concrete is an early-preview trade, so check the takeoff before you rely on it.

Skip the tape measure on the next job.

Send your plans. Get a finished takeoff and quote.

Send your plans2 free houses (+1 commercial or apartment) every month · No credit card required