About FreeConcreteCalculator.org

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

FreeConcreteCalculator.org is a free concrete calculator for slabs, footings, walls, round columns and Sonotubes, fence and deck post holes and steps. It tells you how many cubic yards to order or how many bags to buy. Everything runs in your browser, works on a phone and needs no sign-up.

Who runs it

The site is owned and operated by FreeConcreteCalculator.org, a small U.S. publisher of free online tools. We are not a concrete supplier or contractor and don't sell concrete.

How the numbers are made

The formulas and bag yields are listed on the methodology page. Bag yields come from manufacturers' published data sheets. The math has automated tests, including checks against published figures from the manufacturer and from another concrete calculator.

How the site makes money

We may show display ads below the results. If we ever add affiliate links, they will be labeled and explained on a disclosure page. Payments never change the math.

Estimates, not quotes

Results are planning estimates. Your base, forms and the product you buy all change the real number. See the disclaimer. Questions or a correction? Contact us.