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Project volume takeoff

Measure volume, then know what to buy.

Combine rectangular project areas in mixed units, choose a depth and allowance, then make supplier rounding explicit.

Measurements

Project areas

Add a second rectangular area when your project has distinct zones. Volume comes from the shared project-volume engine.

Primary area
Depth
Preset
Second area
Extra material allowance

A transparent, project-specific adjustment.

Supplier order increment (yd³)
Optional cost
USD

Leave blank for quantity-only planning. Cost is based on the order quantity.

Starting estimate is ready.

Project takeoff

Engine result

Order quantity

3.5 yd³

The user selected a cubic-yard purchasing increment.

Based on 20 ft × 12 ft at the 4 in depth preset.

Base quantity
2.96 yd³
Extra material allowance
+0.3 yd³
Final requirement
3.26 yd³
Order quantity
3.5 yd³

Show your work

  1. Project volume

    20 ft × 12 ft × 4 in= 2.96 yd³ base quantity

  2. 10% extra material allowance

    2.96 yd³ plus 10%= 3.26 yd³ final requirement

  3. Supplier order quantity

    Rounded up to the selected 0.5 yd³ increment= 3.5 yd³ to order

Assumptions & warnings

  • 10% extra material allowance
  • Selected depth preset: four inches
  • info: The purchasing quantity was rounded upward and is greater than the calculated final volume.
Technical details, sources & version
  • SI and customary length and volume unit definitionsexact definition

    The engine uses exact metre-based factors for supported length and volume conversions.

  • Rectangular-prism volume relationshipmathematical relationship

    Volume equals normalized length multiplied by normalized width and normalized depth.

  • User-configured waste or adjustment factoruser configurable assumption
  • User-selected common depth presetuser configurable assumption
  • User-configured cubic-yard purchasing incrementuser configurable assumption

Normalized final volume: 2.49 m³

cubic-project-volume · v1.0.0 · released 2026-08-12

Owner: SolverOrg maintainers · Reviewed 2026-08-12

Method

Each rectangular area is normalized to metres before volume is calculated and summed; selected adjustments and purchasing rounding are shown separately.

Worked example

A 20 ft by 12 ft area with the 4 in preset starts at about 2.96 yd³. The 10% allowance is calculated before the half-yard purchasing quantity is rounded upward.

Measure each zone

Split L-shaped, stepped, or separate zones into rectangles. Measure inside the intended material boundary and use the installed depth—not a nominal product label. Add each distinct rectangle here before ordering.

Related tool

Concrete Calculator — Use the concrete calculator when the project volume is specifically for concrete and needs ready-mix or bag purchasing guidance.