How many bags make a cubic metre?

Mixed concrete weighs about 2,400 kg per m³, so roughly 96 bags of 25 kg (or about 45 bags of 80 lb per cubic yard).

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Free Concrete Calculator

Enter the size of a slab or round holes to see the volume and bags of concrete.

UnitsShapeLength, or diameter for round (m / ft)Width, or depth for round (m / ft)Slab thickness (cm / in)How manyWaste allowance (%)Bag weight (kg / lb)

For round holes, thickness is not used: enter the hole’s diameter and depth.

Results

Concrete volume–

Bags of premix–

Total weight–

How to make a concrete estimate

Choose a slab or round holes (posts, columns) and enter the size.
Enter how many, a waste allowance and the bag weight you buy.
Read the volume, the bags and the total weight.

Frequently asked questions

How many bags make a cubic metre?: Mixed concrete weighs about 2,400 kg per m³, so roughly 96 bags of 25 kg (or about 45 bags of 80 lb per cubic yard).
Is my data stored?: No. Everything happens in your browser and your inputs are saved only on this device.