Concrete Calculator for Footings
Estimate concrete for footings and foundations.
Footings are deeper and carry structural load — often 8 inches or more, per your plan and local code. The calculator starts at 8 inches; treat the footing as its area (length × width) at that thickness. Always follow the engineered spec.
Concrete Calculator
Estimate how much you need — and the cost.
- cubic feet 66.67
- cubic meters 1.888
- tons (US) 5
- tonnes 4.54
Tip: Footing size and depth are code- and load-specific — confirm dimensions against your plans before ordering.
How it's calculated
1 cubic yard = 27 cu ft, covering about 81 sq ft at 4 in / 54 sq ft at 6 in; an 80 lb pre-mix bag yields about 0.6 cu ft (about 45 bags per cubic yard).
See the full Concrete Calculator for the complete how-to, unit conversions, and data sources.
Concrete Calculator for Footings FAQ
How much concrete for a footing?
Multiply the footing length × width × thickness. A 16 in wide × 8 in deep × 40 ft footing is roughly 1.3 cubic yards.
How deep should footings be?
It depends on load and frost depth in your area — commonly 8 inches or more thick and below the frost line. Follow your plans and local code.