Concrete calculator

Concrete wall

Concrete wall volume with stated thickness, waste, and ready-mix rounding.

Calculator result and formula

Ready-mix order: 3.5 yd³

Formula: Wall length × height × thickness ÷ 27 × (1 + waste)

Formula ID: CONC-WALL-001 · Version 1.0.0.

Inputs

  • Wall length: Finished wall run length Default: 20.
  • Wall height: Finished wall height Default: 8.
  • Wall thickness: Concrete wall thickness Default: 6.
  • Waste factor: Allowance for placement and field conditions Default: 10.

How this calculator works

This calculator turns a straight wall's length, height and thickness into a transparent concrete volume with purchase rounding.

  1. Measure finished wall length and height.
  2. Enter the wall thickness specified for the project.
  3. Apply a waste allowance only after confirming openings, returns and geometry.

Worked example: Example: a 20 ft long wall, 8 ft high and 6 in thick has about 2.96 yd³ of net volume. With a 10% allowance, the quantity rounds to 3.5 yd³ in quarter-yard purchase increments.

Assumptions and limitations

  • The wall is treated as straight, rectangular, and solid.
  • Openings and returns are not deducted in this quick takeoff.
  • Waste is applied before quarter-yard purchase rounding.

Common questions

Are openings deducted?
No. This quick takeoff uses gross wall geometry; adjust for significant openings in the final estimate.
Does this design a retaining wall?
No. Engineering, drainage, reinforcement and local-code requirements require independent review.

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