# Concrete Calculator

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

Page: https://askcalculators.com/calculator/concrete-calculator/
Definition: https://askcalculators.com/calculator/concrete-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/concrete-calculator/schema.json
Version: 20.1.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/concrete-calculator/?length=20&width=10&depthInches=4&quantity=1&wastePercent=0&yield60=0.45&yield80=0.6&unitCost=0&laborCost=0&minimumOrderYards=0&orderIncrementYards=0&deliveryCost=0

## Inputs
- length: Length; type=number; required; default=20; min=0
- width: Width; type=number; required; default=10; min=0
- depthInches: Depth; type=number; required; default=4; min=0
- quantity: Number of equal pours; type=number; required; default=1; min=1; max=100000
- wastePercent: Waste allowance; type=number; optional; default=0; min=0
- yield60: Yield per 60 lb bag; type=number; optional; default=0.45; min=0
- yield80: Yield per 80 lb bag; type=number; optional; default=0.6; min=0
- unitCost: Ready-mix cost per cubic yard; type=number; optional; default=0; min=0
- laborCost: Total labor cost; type=number; optional; default=0; min=0
- minimumOrderYards: Supplier minimum order; type=number; optional; default=0; min=0
- orderIncrementYards: Supplier order increment (0 = none); type=number; optional; default=0; min=0
- deliveryCost: Delivery allowance; type=number; optional; default=0; min=0

## Outputs
- cubicYards: Concrete volume; format=number; primary
- cubicFeet: Cubic feet; format=number
- allowanceCubicYards: Volume including waste, before supplier rounding; format=number
- bags60: 60 lb bags; format=integer
- bags80: 80 lb bags; format=integer
- orderCubicYards: Volume including waste; format=number
- materialCost: Ready-mix material estimate; format=currency
- estimatedTotal: Material plus labor estimate; format=currency

## Formula
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.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.