Home & ConstructionFormula-based · Runs in your browser

Concrete Calculator

Estimate concrete quantities, explicit waste, supplier bag yields and optional material/labor cost.

Preparing saved example…

Inputs

Enter the values you know. Optional fields may be left empty.

Local save controls below
Required
ft
Required
ft
Required
in
Required
Optional
%
Optional
ft³
Optional
ft³
Optional
$/yd³
Optional
$
Optional
yd³
Optional
yd³
Optional

Result

Updates as valid inputs change.

Calculated locally
Concrete volume
Cubic feet
Volume including waste, before supplier rounding
60 lb bags
80 lb bags
Volume including waste
Ready-mix material estimate
Material plus labor estimate

Saved locally, explained clearly

Drafts, calculations, scenarios, and workflow progress stay in this browser unless you export them.

Opening local database…

Calculation steps

Follow what happened from the selected formula to the displayed answer.

Show substituted values and intermediate working
Calculate current inputs to see the working.
  1. 1

    Formula selected

    The calculator uses the following formula or method.

    Net ft³ = length × width × depthInches/12 × quantity; order yd³ = net ft³ × (1 + wastePercent/100) / 27; bags = ceil(order ft³ / supplier yield); estimate = order yd³ × price per yd³ + labor.

    Net volume, allowance and supplier-rounded order are distinct. Bag counts are purchasing alternatives. Zero prices mean unpriced; no live pricing or structural design.

  2. 2

    Values entered

    Your values are placed into the calculation.

    Enter values to see what is used in this step.

  3. 3

    Result calculated

    The formula or method produces the following result values.

    Results will appear after a successful calculation.

  4. 4

    Answer formatted

    Displayed values are rounded and formatted using each output’s configured precision.

Scenario comparison

Save working scenarios, then select two or three to compare. Formula versions and inputs remain visible.

No scenarios saved for this calculator yet.

Recent calculations

Successful calculations are retained locally according to your privacy settings.

No local history for this calculator yet.

Data and privacy

How it works

Depth is converted from inches to feet. The rectangular volume is then converted from cubic feet to cubic yards.

Input query strings and outputs

Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.

Input query strings

12
  • ?length= Length

    Number · Required · Default: 20

  • ?width= Width

    Number · Required · Default: 10

  • ?depthInches= Depth

    Number · Required · Default: 4

  • ?quantity= Number of equal pours

    Number · Required · Default: 1

  • ?wastePercent= Waste allowance

    Number · Optional · Default: 0

  • ?yield60= Yield per 60 lb bag

    Number · Optional · Default: 0.45

  • ?yield80= Yield per 80 lb bag

    Number · Optional · Default: 0.6

  • ?unitCost= Ready-mix cost per cubic yard

    Number · Optional · Default: 0

  • ?laborCost= Total labor cost

    Number · Optional · Default: 0

  • ?minimumOrderYards= Supplier minimum order

    Number · Optional · Default: 0

  • ?orderIncrementYards= Supplier order increment (0 = none)

    Number · Optional · Default: 0

  • ?deliveryCost= Delivery allowance

    Number · Optional · Default: 0

Outputs

8
  • cubicYards Concrete volume

    Number · Primary output · Suffix: yd³

  • cubicFeet Cubic feet

    Number · Suffix: ft³

  • allowanceCubicYards Volume including waste, before supplier rounding

    Number

  • bags60 60 lb bags

    Whole number

  • bags80 80 lb bags

    Whole number

  • orderCubicYards Volume including waste

    Number · Suffix: yd³

  • materialCost Ready-mix material estimate

    Currency

  • estimatedTotal Material plus labor estimate

    Currency

Bags

Bag yields vary by product, mixing, and waste. Check the package.

Sources
Limitations
  • Net volume, allowance and supplier-rounded order are distinct. Bag counts are purchasing alternatives. Zero prices mean unpriced; no live pricing or structural design.
  • Material quantities are estimates. Confirm site dimensions, product coverage, waste, and local requirements before ordering or construction.