Concrete Calculator
Estimate concrete volume for common shapes (slabs, walls, footings, columns) with optional bag and cost estimates. It can also approximate bags needed and cost if you enter a price per unit.
Options
Common is 5–10%.
%
Used for a rough cost estimate.
$
Results
Volume (ft³)73.33
Volume (yd³)2.716
80 lb bags (approx.)123
Conversion: 1 yd³ = 27 ft³. Bag yields vary by product—check your bag label.
Dimensions
Slab (rectangular)
ft
ft
in
How to use it
- Select a shape (slab, wall, footing, column).
- Enter dimensions and quantity, then choose units.
- Optionally add a waste percentage and price per yard/m³.
- Review volume and bag/cost estimates.
Key formulas
- Rectangular volume
- V = L × W × D
- Cylinder volume
- V = π × r² × h
- Cubic yards
- yd³ = ft³ / 27
FAQ
Multiply length × width × thickness to get volume, then convert to cubic yards (ft³ ÷ 27) or cubic meters. Thickness is often entered in inches—convert inches to feet by dividing by 12.
Many people add 5–10% to cover waste, spillage, and uneven subgrade. For larger pours, confirm minimum order and overage policies with your supplier.
In the US, ready-mix is commonly sold by the cubic yard. Bagged concrete is sold by bag weight with an approximate yield per bag.
Bag estimates depend on the bag size and the manufacturer’s yield. Use your bag’s stated yield (ft³ per bag) and divide total volume by that yield for the most accurate estimate.
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Disclaimer
Estimates only. Confirm required volumes and structural specs with a professional for critical projects.