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Concrete Quantity and Order Calculator

Enter the dimensions of your pour to see the calculated requirement and a practical quantity to order.

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Your project

What are you pouring?

Choose the project type, then enter finished dimensions inside the forms. The selected units stay with each value.

Concrete shape / project type

Choose what you are pouring to see the matching measurements.

Rectangular concrete measurement diagram Rectangular concrete slab showing length, width, and depth measurements. WidthDepthLength Measure inside the forms
Length × width is the footprint; depth is the poured thickness. Measure inside the forms.
Length
Width
Depth
ASSUMPTION Extra material allowance

A project choice, not a universal recommendation.

PRODUCT INPUT What are you buying?
PURCHASE RULE Ready-mix order increment (yd³)
Optional price input
Cost per purchasing unit
USD

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

Starting estimate is ready.

Your answer stack

What to buy

1.75 yd³

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

YOUR PROJECT

Based on 12 ft × 10 ft at 4 in deep.

BASE QUANTITY Mathematical requirement
1.48 yd³
ALLOWANCE Extra material allowance
+0.15 yd³
FINAL REQUIREMENT Base + allowance
1.63 yd³
WHAT TO BUY Practical purchase quantity
1.75 yd³

Why

Short calculation summary

The engine normalizes the entered measurements, calculates the base volume, applies only your selected allowance, then applies your selected purchasing rule.

  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

Critical assumptions

  • ASSUMPTION10% extra material allowance
  • ASSUMPTIONOrder in 0.25 yd³ increments
  • info: The ready-mix order quantity was rounded upward and exceeds the calculated final quantity.
How this was calculated

Normalized final volume: 1.25 m³

Sources & calculation provenance

  • 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

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

Owner: SolverOrg maintainers · Reviewed 2026-08-12

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.

Method

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

Related calculator

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

Need to report a problem?

Contact SolverOrg with the dimensions, selected inputs, and the result you received.