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Concrete calculator
How much concrete for a slab, column or footing, with bags to buy and a waste allowance.
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About Concrete calculator
Work out the concrete volume for a slab, column or footing from length, width and thickness, then convert to bags or cubic metres. Volume is length times width times depth, plus an allowance of 5 to 10 percent for waste and uneven ground. Order slightly more than you need.
How to use Concrete calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
How much concrete do I need for a 4 by 4 m slab?
At 10 cm thick that is 1.6 cubic metres, so order about 1.7 to 1.8 with the waste allowance included.
Is Concrete calculator free?
Yes. Concrete calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.