What the tool does, how to run it, and what to expect from the result.
For a slab or footing, volume is length x width x depth. For a round column or post hole, volume is pi x radius squared x height. The bag count divides that volume by the bag's published yield (0.30, 0.45, or 0.60 cubic feet for a 40, 60, or 80 lb bag). Add 5-10% on top for spillage and an uneven subgrade.
A quick way to understand who this helps, what it solves, and where it connects next.
DIYers and contractors estimating a concrete pour before buying material.
Estimating how much ready-mix concrete a slab, footing, or post hole needs.
Short answers for the questions people usually have before trying a utility like this.
Yes. It is completely free, with no sign-up and no usage limits.
No. Every number is computed locally in your browser tab.
Most contractors add 5-10% over the calculated volume for spillage, an uneven subgrade, and minor form leaks, more on a rough or sloped site.
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Enter the dimensions of a slab, footing, or round column to get the concrete volume and how many bags of ready-mix you need.
1.23 cubic yards33.3 cubic feet, 0.94 cubic meters
75 bagsof 60 lb ready-mix concrete
Add 5-10% extra for spillage, uneven subgrade, and waste. Ready-mix bag yields are manufacturer figures and can vary slightly by brand; check the bag if precision matters.