Concrete Footing Calculator
Concrete footing calculator for trenches, wall footings, and grade beams.
Estimate concrete for continuous strip footings, trench footings, retaining wall footings, foundation runs, deck beam trenches, and grade beams. Use the main concrete calculator to enter length, width, depth, quantity, waste, and price.
How to calculate concrete for a footing
For a concrete footing or trench, multiply the total length by the footing width by the footing depth. If you have multiple footing runs with the same dimensions, multiply the result by the quantity.
Formula
Length × Width × Depth × Quantity = Concrete Volume
Footing dimensions often depend on structure type, soil conditions, loads, frost depth, reinforcement, and local code. Use this page for estimating material volume, then confirm requirements with a qualified professional when needed.
Concrete footing example
A footing that is 40 ft long, 12 inches wide, and 12 inches deep has a volume of 40 cubic feet. Since one cubic yard equals 27 cubic feet, that is about 1.48 cubic yards before waste. With 10% waste, the estimate is about 1.63 cubic yards.
Footing calculator FAQ
What measurements do I need for a footing estimate?
You need the total footing length, footing width, footing depth, quantity if there are multiple runs, waste percentage, and concrete price.
Can this estimate trench footings?
Yes. Use the Footing / Trench mode in the main concrete calculator and enter the trench length, width, and depth.
Does this account for rebar?
No. This page estimates concrete volume only. Rebar, chairs, tie wire, labor, excavation, gravel, and inspections are separate.
Can I use metric units?
Yes. The Numeravo concrete calculator supports metric footing estimates using meters, centimeters, and cubic meters.