{
  "id": "concrete-calculator",
  "version": "20.13.0",
  "name": "Concrete Calculator",
  "shortName": "Concrete",
  "description": "Estimate concrete quantities, explicit waste, supplier bag yields and optional material/labor cost. Add editable USD material and labor prices and compare low, middle and high budget scenarios.",
  "category": "Home & Construction",
  "categorySlug": "home-construction",
  "keywords": [
    "concrete yards",
    "concrete bags",
    "slab volume",
    "cubic yards"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "migrated",
  "migratedDate": "2026-09-10",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/concrete-calculator.json",
    "qualifiedReview": "pending",
    "qualifiedReviewer": null,
    "qualifiedReviewDate": null,
    "formulaVersion": "20.13.0",
    "referenceCoverage": "references-listed",
    "releaseTestScope": "Flagship reference cases are specified in scripts/test-v20-1.mjs; consult release evidence for executed results.",
    "historicalMetadataDate": "2026-08-18",
    "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
  },
  "notice": "Planning quantities and user-entered USD costs, not a contractor quote, structural design or code approval. Default prices are zero (unpriced); enter your supplier and labor quotes. New changes await independent review.",
  "urls": {
    "page": "/us/concrete/",
    "definition": "/us/concrete/definition.json",
    "schema": "/us/concrete/schema.json",
    "llms": "/us/concrete/llms.txt",
    "legacyDefinition": "/us/concrete/definition.json"
  },
  "queryExample": "https://askcalculators.com/us/concrete/?length=9&width=9&depthInches=4&quantity=1&wastePercent=0&unitCost=160&laborCost=250&minimumOrderYards=1.1&orderIncrementYards=0.25&deliveryCost=75&costSpreadPercent=15",
  "queryParameters": {
    "unitSystem": {
      "label": "Dimension units",
      "type": "select",
      "required": false,
      "default": "imperial"
    },
    "length": {
      "label": "Length (ft / m)",
      "type": "number",
      "required": true,
      "default": 20
    },
    "width": {
      "label": "Width (ft / m)",
      "type": "number",
      "required": true,
      "default": 10
    },
    "depthInches": {
      "label": "Depth (in / cm)",
      "type": "number",
      "required": true,
      "default": 4
    },
    "quantity": {
      "label": "Number of equal pours",
      "type": "number",
      "required": true,
      "default": 1
    },
    "wastePercent": {
      "label": "Waste allowance",
      "type": "number",
      "required": false,
      "default": 0
    },
    "yield60": {
      "label": "Yield per 60 lb bag",
      "type": "number",
      "required": false,
      "default": 0.45
    },
    "yield80": {
      "label": "Yield per 80 lb bag",
      "type": "number",
      "required": false,
      "default": 0.6
    },
    "unitCost": {
      "label": "Ready-mix cost per cubic yard",
      "type": "number",
      "required": false,
      "default": 0
    },
    "laborCost": {
      "label": "Total labor cost",
      "type": "number",
      "required": false,
      "default": 0
    },
    "minimumOrderYards": {
      "label": "Supplier minimum order",
      "type": "number",
      "required": false,
      "default": 0
    },
    "orderIncrementYards": {
      "label": "Supplier order increment (0 = none)",
      "type": "number",
      "required": false,
      "default": 0
    },
    "deliveryCost": {
      "label": "Delivery allowance",
      "type": "number",
      "required": false,
      "default": 0
    },
    "costSpreadPercent": {
      "label": "Low/high variation around entered subtotal (%)",
      "type": "percent",
      "required": false,
      "default": 15
    }
  },
  "inputs": [
    {
      "id": "unitSystem",
      "label": "Dimension units",
      "type": "select",
      "defaultValue": "imperial",
      "options": [
        {
          "label": "US customary (ft, in)",
          "value": "imperial"
        },
        {
          "label": "Metric (m, cm)",
          "value": "metric"
        }
      ],
      "help": "Changing this selector converts dimensions already entered. Prices keep the purchasing unit printed beside each price."
    },
    {
      "id": "length",
      "label": "Length (ft / m)",
      "type": "number",
      "required": true,
      "defaultValue": 20,
      "min": 0,
      "step": 0.1,
      "width": "half"
    },
    {
      "id": "width",
      "label": "Width (ft / m)",
      "type": "number",
      "required": true,
      "defaultValue": 10,
      "min": 0,
      "step": 0.1,
      "width": "half"
    },
    {
      "id": "depthInches",
      "label": "Depth (in / cm)",
      "type": "number",
      "required": true,
      "defaultValue": 4,
      "min": 0,
      "step": 0.1,
      "width": "half"
    },
    {
      "id": "quantity",
      "label": "Number of equal pours",
      "type": "number",
      "required": true,
      "defaultValue": 1,
      "min": 1,
      "max": 100000,
      "step": 1,
      "width": "half"
    },
    {
      "id": "wastePercent",
      "label": "Waste allowance",
      "type": "number",
      "defaultValue": 0,
      "min": 0,
      "step": 0.01,
      "suffix": " %",
      "width": "half"
    },
    {
      "id": "yield60",
      "label": "Yield per 60 lb bag",
      "type": "number",
      "defaultValue": 0.45,
      "min": 0,
      "step": 0.01,
      "suffix": " ft³",
      "width": "half"
    },
    {
      "id": "yield80",
      "label": "Yield per 80 lb bag",
      "type": "number",
      "defaultValue": 0.6,
      "min": 0,
      "step": 0.01,
      "suffix": " ft³",
      "width": "half"
    },
    {
      "id": "unitCost",
      "label": "Ready-mix cost per cubic yard",
      "type": "number",
      "defaultValue": 0,
      "min": 0,
      "step": 0.01,
      "suffix": " $/yd³",
      "width": "half"
    },
    {
      "id": "laborCost",
      "label": "Total labor cost",
      "type": "number",
      "defaultValue": 0,
      "min": 0,
      "step": 0.01,
      "suffix": " $",
      "width": "half"
    },
    {
      "id": "minimumOrderYards",
      "label": "Supplier minimum order",
      "type": "number",
      "defaultValue": 0,
      "min": 0,
      "step": 0.01,
      "width": "half",
      "suffix": " yd³"
    },
    {
      "id": "orderIncrementYards",
      "label": "Supplier order increment (0 = none)",
      "type": "number",
      "defaultValue": 0,
      "min": 0,
      "step": 0.01,
      "width": "half",
      "suffix": " yd³"
    },
    {
      "id": "deliveryCost",
      "label": "Delivery allowance",
      "type": "number",
      "defaultValue": 0,
      "min": 0,
      "step": 0.01,
      "width": "half",
      "suffix": ""
    },
    {
      "id": "costSpreadPercent",
      "label": "Low/high variation around entered subtotal (%)",
      "type": "percent",
      "defaultValue": 15,
      "min": 0,
      "max": 100,
      "step": 1,
      "help": "A user-adjustable planning scenario, not a researched local price range."
    }
  ],
  "outputs": [
    {
      "id": "cubicYards",
      "label": "Concrete volume",
      "format": "number",
      "digits": 3,
      "suffix": " yd³",
      "primary": true
    },
    {
      "id": "cubicFeet",
      "label": "Cubic feet",
      "format": "number",
      "digits": 2,
      "suffix": " ft³"
    },
    {
      "id": "allowanceCubicYards",
      "label": "Volume including waste, before supplier rounding",
      "format": "number"
    },
    {
      "id": "bags60",
      "label": "60 lb bags",
      "format": "integer"
    },
    {
      "id": "bags80",
      "label": "80 lb bags",
      "format": "integer"
    },
    {
      "id": "orderCubicYards",
      "label": "Volume including waste",
      "format": "number",
      "suffix": " yd³"
    },
    {
      "id": "materialCost",
      "label": "Ready-mix material estimate",
      "format": "currency"
    },
    {
      "id": "estimatedTotal",
      "label": "Material plus labor estimate",
      "format": "currency"
    },
    {
      "id": "cubicMetres",
      "label": "Net volume (m³)",
      "format": "number",
      "digits": 3
    },
    {
      "id": "laborCost",
      "label": "Labor allowance",
      "format": "currency",
      "currency": "USD"
    },
    {
      "id": "deliveryCost",
      "label": "Delivery allowance",
      "format": "currency",
      "currency": "USD"
    },
    {
      "id": "unitRate",
      "label": "Entered USD rate / cubic yard",
      "format": "currency",
      "currency": "USD"
    },
    {
      "id": "costLow",
      "label": "Low budget scenario",
      "format": "currency",
      "currency": "USD"
    },
    {
      "id": "costMid",
      "label": "Middle budget scenario",
      "format": "currency",
      "currency": "USD"
    },
    {
      "id": "costHigh",
      "label": "High budget scenario",
      "format": "currency",
      "currency": "USD"
    },
    {
      "id": "pricingStatus",
      "label": "Pricing status",
      "format": "text"
    }
  ],
  "formula": {
    "expression": "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.; material = unrounded purchase quantity × entered unit price; middle = material + labor + delivery; low/high = middle × (1 ∓ variation/100)",
    "note": "Net volume, allowance and supplier-rounded order are distinct. Bag counts are purchasing alternatives. Zero prices mean unpriced; no live pricing or structural design."
  },
  "examples": [
    {
      "label": "Illustrative USD purchasing scenario",
      "inputs": {
        "length": 9,
        "width": 9,
        "depthInches": 4,
        "quantity": 1,
        "wastePercent": 0,
        "unitCost": 160,
        "laborCost": 250,
        "deliveryCost": 75,
        "costSpreadPercent": 15,
        "minimumOrderYards": 1.1,
        "orderIncrementYards": 0.25
      }
    }
  ],
  "sources": [
    {
      "label": "NIST SI conversion factors — accessed 10 September 2026",
      "url": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors"
    },
    {
      "label": "QUIKRETE purchasing calculator — accessed 10 September 2026",
      "url": "https://www.quikrete.com/calculator/main.asp"
    },
    {
      "label": "NIST: SI conversion factors",
      "url": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8"
    },
    {
      "label": "OpenStax Prealgebra: geometry and measurement reference",
      "url": "https://openstax.org/details/books/prealgebra-2e"
    }
  ],
  "publicSlug": "concrete",
  "namespace": "us",
  "countries": [
    "us"
  ]
}