Free Tool
Free concrete footing calculator
Enter your footing length, width, and depth and get cubic yards, cubic feet, and bag counts, plus form boards and continuous rebar when you need them. Free, no signup.
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Get the footing volume before the truck rolls
Footings are long and narrow, so the math is easy to fumble in your head. Enter the run in feet and the width and depth in inches, and the calculator returns cubic yards for the ready-mix plant along with cubic feet and bag counts for the short runs you handle yourself.
Turn on rebar and set how many continuous bars run the length. The calculator multiplies that by your footing run and tells you the linear feet and how many twenty foot sticks to buy. The form boards line covers both sides of the trench.
The waste allowance matters more on a footing than most people expect, because a hand dug trench is never a clean rectangle and the extra width adds up fast over a long run. Ten percent is a fair floor, and rough digging earns more.
Concrete Footing Calculator questions
How do I calculate concrete for a footing?
Multiply the run by the width by the depth, convert to cubic yards, and add waste. The calculator handles the unit conversions and shows the yards to order.
How many rebar bars go in a footing?
Two or three continuous bars is common for residential work, but follow your plan or local code. Set the bar count in the calculator to get the linear feet.
How deep should a footing be?
Deep enough to sit below the frost line for your area and to match the design load. Your local code sets the minimum, so confirm before you dig.
Is this really free?
Yes. No email, no signup, and nothing you type leaves your browser.
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Disclaimer: These free tools and templates are provided for general information and estimating purposes only. All results — including quantities, material and cost estimates, load, sizing, and span figures, scores, and any guidance or warnings — are rough approximations that may not fit your specific project, site conditions, local building codes, or current prices. They are not engineering, architectural, structural, legal, financial, or other professional advice, and are not a substitute for a licensed engineer, architect, contractor, or other qualified professional. Always confirm quantities, sizing, and structural, electrical, mechanical, and code requirements with a licensed professional and your local authority having jurisdiction before purchasing materials or performing any work. Werx makes no warranty as to accuracy and accepts no liability for any decision made using these tools. Use at your own risk. See our Terms of Service.