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Verified calculator with a transparent formula

Professional

Concrete Volume Calculator.

Calculates the volume of concrete needed for a slab, footing, or column based on dimensions and number of units.

Results update live as you type.
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Your inputs

How it works

  1. 1

    Convert depth from inches to feet by dividing by 12.

  2. 2

    Multiply length by width to get the area in square feet.

  3. 3

    Multiply the area by the depth in feet to get volume per unit.

  4. 4

    Multiply by the number of units to get total volume.

length * width * (depth / 12) * units

Frequently asked questions

How do I account for waste or overage?

Add 5-10% to the total volume to cover spillage, uneven subgrades, or slight over-excavation.

Can I use this for round columns?

No, this calculator is for rectangular or square shapes. For round columns, use the formula π × radius² × height.

What if my dimensions are in meters?

Convert meters to feet first (1 m = 3.28084 ft) or use the cubic meters result after entering feet.

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Results

Formula checked

Total Concrete Volume

0ft³

Volume in Cubic Yards0yd³
Volume in Cubic Meters0m³
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Estimate for general guidance only — verify important decisions with an appropriate professional.

How it works

Calculates the volume of concrete needed for a slab, footing, or column based on dimensions and number of units.

  1. Convert depth from inches to feet by dividing by 12.
  2. Multiply length by width to get the area in square feet.
  3. Multiply the area by the depth in feet to get volume per unit.
  4. Multiply by the number of units to get total volume.

Formulas

The math behind this calculator, written out so you can verify the result.

Rectangular Volume

V = L × W × H

Multiply length, width, and height (all in the same units) to get the volume.

Example:

Input: L=10 ft, W=10 ft, H=4 in (0.333 ft)

Calculation: 10 × 10 × 0.333

Result: 33.3 ft³

Real-world use cases

Where this calculation shows up in everyday life.

Slab Foundation

Determine concrete needed for a house slab or patio.

Example: 20 ft × 30 ft slab, 4 in thick

Footings

Calculate concrete for continuous footings under walls.

Example: 40 ft long, 1 ft wide, 1 ft deep

Multiple Piers

Estimate concrete for several identical piers or posts.

Example: 10 piers, each 1 ft × 1 ft × 3 ft

Tips and common mistakes

Tips

  • Always measure in the same unit system to avoid errors.
  • Order a little extra concrete (5-10%) to avoid running short.
  • Check with your supplier for minimum order quantities.
  • Use the cubic yards result when ordering from a ready-mix company.

Common Mistakes to Avoid

  • Forgetting to convert inches to feet before multiplying.
  • Not multiplying by the number of identical units.
  • Using outside dimensions when inside dimensions are needed.

Assumptions and limitations

  • Use the stated inputs and units.
  • Results are estimates for planning and education.
  • Check measurements and source data before making an important decision.