SolverOrg

Concrete takeoff

Know the concrete quantity before you order.

Measure your slab, footing, wall, column, or post holes. SolverOrg makes the volume, allowance, and purchasing rule visible.

Measurements

Project worksheet

All dimensions use the selected unit. Presets only fill inputs; the engine performs every calculation.

Concrete shape

Choose the geometry that matches the concrete portion you are measuring.

Length
Width
Depth
Extra material allowance

A project choice, not a universal recommendation.

What are you buying?
Ready-mix order increment (yd³)
Optional cost
USD

Leave blank for quantity-only planning. Your cost stays in this browser.

Starting estimate is ready.

Project takeoff

Engine result

Order quantity

1.75 yd³

Rounded upward to the supplier/user-configured cubic-yard increment.

Based on 12 ft × 10 ft at 4 in deep.

Base quantity
1.48 yd³
Extra material allowance
+0.15 yd³
Final requirement
1.63 yd³
Order quantity
1.75 yd³

Show your work

  1. Project volume

    12 ft × 10 ft × 4 in= 1.48 yd³ base quantity

  2. 10% extra material allowance

    1.48 yd³ plus 10%= 1.63 yd³ final requirement

  3. Supplier order quantity

    Rounded up using the selected purchasing rule= 1.75 yd³ to order

Assumptions & warnings

  • 10% extra material allowance
  • Order in 0.25 yd³ increments
  • info: The ready-mix order quantity was rounded upward and exceeds the calculated final quantity.
Technical details, sources & version
  • SI and customary length and volume unit definitionsexact definition

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

  • Rectangular-prism volume relationshipmathematical relationship

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

  • Circular-cylinder volume relationshipmathematical relationship

    Volume equals pi times radius squared times normalized height or depth.

  • User-configured concrete waste factoruser configurable assumption
  • User or supplier-configured ready-mix purchasing incrementuser configurable assumption

    The calculator does not assume a universal supplier order increment.

  • Configured bag yielduser configurable assumption

    Bag yield is product-specific and must be supplied from the selected product or project information.

  • User-entered material unit costuser configurable assumption

Normalized final volume: 1.25 m³

concrete-quantity-order · v1.0.0 · released 2026-08-12

Owner: SolverOrg maintainers · Reviewed 2026-08-12

Method

The engine normalizes dimensions to metres, calculates rectangular or cylindrical volume, applies a selected waste factor, then applies only the configured purchasing rule.

Worked example

A 12 ft by 10 ft slab at 4 in depth starts at about 1.48 yd³. This default worksheet shows how the selected 10% allowance and quarter-yard purchasing increment affect the final order quantity.

Measure before you pour

Measure finished length and width inside the forms, then measure planned poured depth. For footings and walls, measure each distinct run separately. For columns or holes, record diameter, height or depth, and the count of identical pieces.

Related tool

Cubic Yard Calculator — Use the cubic-yard calculator to combine or compare rectangular project areas before selecting a material-specific takeoff.