How many bags do I need?

The calculator divides the total volume by each bag size’s yield (about 0.011/0.017/0.022 m³ for 40/60/80 lb bags) and rounds up. Bag yields are approximate.

Concrete Calculator

Estimate the concrete you need for slabs, footings, and round columns in cubic yards or meters, plus how many 40, 60, or 80 lb bags it takes.

How to use Concrete Calculator

Pick the shape and your units.
Enter the dimensions, quantity, and waste allowance.
Read the volume and number of bags.

Frequently asked questions

How many bags do I need?: The calculator divides the total volume by each bag size’s yield (about 0.011/0.017/0.022 m³ for 40/60/80 lb bags) and rounds up. Bag yields are approximate.

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