Concrete Footing Calculator

Footing concrete volume is calculated from Length × Width × Depth. For several identical footings, multiply the volume of one footing by the quantity. The result is then converted to cubic yards or cubic meters, and your selected waste allowance is applied separately to the recommended order.

1. 1Choose Continuous / Strip or Rectangular Pad.
2. 2Enter the footing length, width and depth with their units.
3. 3Enter the number of identical footings, or switch to a total combined length.
4. 4Choose a waste allowance.
5. 5Optionally enter your local concrete price.
6. 6Select Calculate.
7. 7Review the volume, weight and bag quantities.

Volume = Length × Width × Depth. Every measurement is normalized before multiplying, so you can freely mix feet, inches, meters and centimeters.

Continuous / Strip Footing — a long rectangular concrete footing running beneath a wall or similar continuous structural element.

Rectangular Pad Footing — an isolated rectangular concrete footing used beneath individual supports or columns.

These descriptions are informational. Which footing type, size and reinforcement a project needs is determined by plans, codes and qualified professional guidance — not by this calculator.

Increasing either footing width or depth increases concrete volume proportionally. If depth changes from 8 inches to 12 inches while everything else stays the same, 12 ÷ 8 = 1.5, so the concrete volume increases by 50%.

This is a mathematical explanation only. It does not imply that 8 or 12 inches is an appropriate dimension for any project.

• Mixing inches and feet in the same measurement.
• Forgetting to multiply by the number of identical footings.
• Double-counting overlapping corners in connected footing runs.
• Using excavation dimensions instead of the intended concrete dimensions.
• Forgetting that the actual excavation can vary from the planned dimensions.