Footing Concrete Calculators
Explore our suite of free footing calculators to precisely estimate volume, weight, and costs for your next project. Select a tool below to get started.
Estimating Concrete for Footings
Footings are the widened base of a foundation that spread the load of a structure into the soil. Standard homes use continuous spread footings (trenches), while columns sit on isolated pad footings. Because footings are often poured directly into excavated earth, dimensions can vary greatly, making precise calculations and aggressive waste factors vital.
Core Formula
Trench Volume (yd³) = Length (ft) × Width (ft) × Depth (ft) ÷ 27
Frequently Asked Questions
- Why calculate footings separately from walls?
- Footings are strictly structural bases and are poured before the foundation walls are formed. They often require different dimensions and sometimes different concrete mix designs.
- What should my waste factor be for trench footings?
- Because earth trenches are rarely perfectly straight or level, you should add a 10% to 15% waste factor for footings poured directly against dirt.
- How wide should a footing be?
- Building codes generally dictate that a footing must be at least twice the width of the wall it supports (e.g., an 8-inch wall needs a 16-inch wide footing).
- How do I calculate stepped footings?
- Calculate the volume of each horizontal footing segment individually utilizing length, width, and depth, then sum the volumes together.