How do I calculate concrete for footings?
Multiply footing length by width by depth to get cubic feet, multiply by the number of footings, then divide by 27 for cubic yards. Add about 10% waste before ordering.
Free concrete calculator
Concrete Footing Cost Calculator
Estimate concrete volume, ready-mix cost, rebar allowance, and total footing material cost for deck posts, walls, and small foundations.
Estimate$529 material estimate
- Footing concrete
- 1.6 cu yd
- Ready-mix allowance
- $249
- Short-load fee
- $100
- Rebar allowance
- $180
Estimating Notes
- Footing depth is often driven by frost line, soil, and local code, not just load.
- Small footing orders often trigger a short-load fee, so combining pours can lower delivered cost.
- Rebar cost is modest compared with the cost of repairing an under-reinforced foundation.
Calculator FAQs
Do footings need rebar?
Many footings require reinforcement, but the exact bar size and spacing depends on local code, soil, loads, and the structure being supported. Use the calculator as a budgeting tool, then confirm with plans or an engineer.