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Concrete Footing Calculator

Calculate the volume and weight of concrete needed for continuous footings, including foundations, retaining walls, and grade beams. Enter the length, width, and depth of your footing to get results in cubic yards, bags, and ready-mix truckloads. Buying a little extra reduces the chance of coming up short.

Footing
Units
Concrete Volume3.26 yd³
Bags
147 × 80 lb
Weight
13,200 lb
Loads
1

How to use this calculator

  1. 1. Enter dimensions
    Fill in the required fields for this concrete form.
  2. 2. Click Calculate
    Review volume, bag counts, weight, and ready-mix loads.
  3. 3. Adjust if needed
    Open advanced options for waste, density, prices, and truck capacity.

Common examples

40 ft footing @ 24 in × 12 in
Common residential footing size.
80 ft footing @ 18 in × 10 in
Smaller footing; verify local requirements.

Estimating notes

  • Use the largest width/depth you measure—excavations are rarely perfectly uniform.
  • Add waste for over-excavation, sloughing, and spillage (5–10% is common).
  • Check local code and soil requirements for minimum footing dimensions and reinforcement.
  • Bag yields and density vary by product; verify values on your bag or supplier spec sheet.
  • Cost estimates exclude delivery fees, taxes, and minimum loads.