Concrete wall

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 · Published · Last reviewed Aug 26, 2026.

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 mistakes to avoid

• Confirm the measurement basis and units before using the result.
• Keep waste or allowance visible and adjust it for the actual job conditions.
• Confirm supplier packaging, delivery increments, specifications, and final site requirements before ordering.

Calculator disclaimer

This planning calculator does not determine structural design, code compliance, installation requirements, or guaranteed pricing. Confirm final requirements with the appropriate responsible professional, authority, manufacturer, and supplier.

Formula review and sources

Internal QA complete · independent external review pending · Formula assumptions documented.

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