Concrete Footing Calculator

How much concrete do I need for a footing?

ft
in
in
bars

Order this much ready-mix concrete

2.25cubic yards

Trench footing with 10% extra for irregular sides. Your plans, soil and frost depth set the real size, so confirm with local code.

60 ft of footing in plan16 in wide8 in thick
Volume with extra58.7 cu ft
Cubic yards2.17
80 lb bags (0.60 cu ft)98
60 lb bags (0.45 cu ft)131
Footing section16 × 8 in
Rebar, 20 ft bars7

Measure a continuous trench footing for walls and get concrete plus continuous rebar runs.

How it works

Length × width × thickness with 10% added, since trench sides are never straight. Bars are total runs in 20 foot lengths with 5% extra.

Before you order

  • Footing width and depth come from your plans and soil, so treat this as the quantity step.
  • Keep the bottom of the trench undisturbed and clean before the pour.
  • Set steel on supports to hold cover from the soil.

Common questions

How deep should a footing be?

It must reach below your local frost depth. Your building department publishes that number.

Can I pour a footing without forms?

Yes, when clean trench sides will hold, but the volume can grow fast. Measure actual width after digging.