It works for rectangular slabs, footings, sonotubes and post holes. Just enter the dimensions in any consistent unit. For cylinders, divide the volume by π × radius² and use the result as the area; the tool handles the maths once you give it the area and the depth.
Calculator
Formula used
Volume = length × width × thickness · 1 yd³ = 27 ft³ = 0.7646 m³
How to use the Concrete Volume Calculator
- Measure the slab length, width and thickness in the chosen unit.
- Set a waste allowance (10% is typical for residential pours).
- Read the volume in cubic yards and metres.
- Choose between 80 lb bags and a ready-mix delivery.
About this tool
The Concrete Volume Calculator is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Pouring a patio or shed slab.
- Filling sonotube footings for a deck.
- Setting fence post holes.
- Ordering ready-mix for a small driveway.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Is ready-mix cheaper than bags?
For anything over 1 cubic yard, yes. Below 1 yd³, bagged concrete is usually cheaper once you include the short-load fee.
How much waste should I add?
10% is the standard residential figure. Add 5% for simple rectangles and 15% for complicated shapes with many edges.
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