Disclaimer

Draft: the owner's legal business name will be added here before launch.

Last updated November 11, 2026.

This website is operated by FreeConcreteCalculator.org. By using it, you agree to this disclaimer and to our terms of use.

Estimates for general information only

The calculators, tables and guides on FreeConcreteCalculator.org give approximate, planning-level estimates of concrete quantities. They are provided for general information only and are not a quote, bid, guarantee, or engineering, construction, legal or financial advice. No contractor, engineer or advisor relationship is created by using this site.

Results depend on your inputs and our assumptions

Every result is based on the measurements you enter and on default figures such as the waste allowance and the bag yields manufacturers publish. Real quantities differ because of uneven bases, form deflection, oversized holes, mix design and how the work is done, and some products yield more or less than standard mix. Check your measurements and the yield printed on your bag.

Prices

The site does not publish concrete prices. Any cost shown is your own price multiplied by the quantity. Ready-mix suppliers may add minimum-order, short-load, delivery or waiting-time charges that the calculator does not include.

Before you order or build

Confirm quantities with your supplier. Footing sizes, wall thickness, slab thickness and reinforcement for anything structural should follow your local building code, approved plans or an engineer. Get permits where required, and call 811 before you dig to have underground utilities marked. Wet concrete is caustic: follow the safety directions on the bag, and wear gloves and eye protection.

No warranty

We work to keep the math correct, but the site is provided "as is" and "as available," without warranties of any kind, express or implied, including accuracy, completeness or fitness for a particular purpose. To the fullest extent allowed by law, FreeConcreteCalculator.org is not liable for any loss or damage arising from use of, or reliance on, this site or its results, including over- or under-ordering materials, project costs or delays.

Third-party links and ads

Pages may link to other websites, such as manufacturers' data sheets, and may show ads. We don't control third-party sites and aren't responsible for their content. A link is not an endorsement.

Questions or corrections

If something looks wrong, email hello@freeconcretecalculator.org with the page, your inputs and the result you expected. The formulas and sources are on the methodology page.