{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://askcalculators.com/us/gravel/schema.json",
  "title": "Gravel Calculator inputs",
  "description": "Estimate the amount of gravel needed for your driveway, path, or landscaping project. Add editable USD material and labor prices and compare low, middle and high budget scenarios.",
  "type": "object",
  "properties": {
    "unitSystem": {
      "title": "Dimension units",
      "type": "string",
      "description": "Changing this selector converts dimensions already entered. Prices keep the purchasing unit printed beside each price.",
      "default": "imperial",
      "enum": [
        "imperial",
        "metric"
      ],
      "x-optionLabels": {
        "imperial": "US customary (ft, in)",
        "metric": "Metric (m, cm)"
      }
    },
    "length": {
      "title": "Length (ft / m)",
      "type": "number",
      "default": 20
    },
    "width": {
      "title": "Width (ft / m)",
      "type": "number",
      "default": 10
    },
    "depth": {
      "title": "Depth (in / cm)",
      "type": "number",
      "default": 4
    },
    "wastePercent": {
      "title": "Purchasing allowance (%)",
      "type": "number",
      "default": 0,
      "minimum": 0,
      "maximum": 100,
      "x-step": 0.01
    },
    "density": {
      "title": "Entered density (lb/ft³)",
      "type": "number",
      "description": "Illustrative default only. Replace with your supplier’s bulk density.",
      "default": 100,
      "minimum": 0,
      "x-step": 0.01
    },
    "unitCost": {
      "title": "Material price (USD / cubic yard)",
      "type": "number",
      "description": "Zero means unpriced. Use a current supplier quote; do not treat zero as free.",
      "default": 0,
      "minimum": 0,
      "x-step": 0.01,
      "x-unit": "currency"
    },
    "laborCost": {
      "title": "Total labor allowance (USD)",
      "type": "number",
      "default": 0,
      "minimum": 0,
      "x-step": 0.01,
      "x-unit": "currency"
    },
    "deliveryCost": {
      "title": "Delivery allowance (USD)",
      "type": "number",
      "default": 0,
      "minimum": 0,
      "x-step": 0.01,
      "x-unit": "currency"
    },
    "costSpreadPercent": {
      "title": "Low/high variation around entered subtotal (%)",
      "type": "number",
      "description": "A user-adjustable planning scenario, not a researched local price range.",
      "default": 15,
      "minimum": 0,
      "maximum": 100,
      "x-step": 1,
      "multipleOf": 1,
      "x-unit": "percent"
    }
  },
  "required": [],
  "additionalProperties": false,
  "x-askcalculators": {
    "version": "20.13.0",
    "calculatorUrl": "https://askcalculators.com/us/gravel/",
    "queryExample": "https://askcalculators.com/us/gravel/?length=27&width=12&depth=1&wastePercent=0&density=100&unitCost=70&laborCost=100&deliveryCost=50&costSpreadPercent=15",
    "migrationStatus": "migrated",
    "reviewStatus": "pending",
    "pageStatus": "live",
    "workStatus": "pending",
    "migratedDate": "2026-09-10",
    "formula": {
      "expression": "Volume = area × depth; estimated weight = volume × selected gravel density.; material = unrounded purchase quantity × entered unit price; middle = material + labor + delivery; low/high = middle × (1 ∓ variation/100)"
    },
    "quality": {
      "availability": "live",
      "technicalReviewRecord": "/reviews/gravel-calculator.json",
      "qualifiedReview": "pending",
      "qualifiedReviewer": null,
      "qualifiedReviewDate": null,
      "formulaVersion": "20.13.0",
      "referenceCoverage": "references-listed",
      "releaseTestScope": "Catalog and regression checks are not a professional formula audit; consult release evidence.",
      "historicalMetadataDate": "2026-08-18",
      "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
    },
    "outputs": {
      "cubicYards": {
        "title": "Order volume (yd³)",
        "type": "number",
        "x-format": "number",
        "x-digits": 3,
        "x-primary": true
      },
      "cubicMetres": {
        "title": "Order volume (m³)",
        "type": "number",
        "x-format": "number",
        "x-digits": 3
      },
      "tons": {
        "title": "US short tons using entered density",
        "type": "number",
        "x-format": "number",
        "x-digits": 3
      },
      "materialCost": {
        "title": "Material cost",
        "type": "number",
        "x-format": "currency",
        "x-currency": "USD"
      },
      "laborCost": {
        "title": "Labor allowance",
        "type": "number",
        "x-format": "currency",
        "x-currency": "USD"
      },
      "deliveryCost": {
        "title": "Delivery allowance",
        "type": "number",
        "x-format": "currency",
        "x-currency": "USD"
      },
      "unitRate": {
        "title": "Entered USD rate / cubic yard",
        "type": "number",
        "x-format": "currency",
        "x-currency": "USD"
      },
      "estimatedTotal": {
        "title": "Entered subtotal",
        "type": "number",
        "x-format": "currency",
        "x-currency": "USD"
      },
      "costLow": {
        "title": "Low budget scenario",
        "type": "number",
        "x-format": "currency",
        "x-currency": "USD"
      },
      "costMid": {
        "title": "Middle budget scenario",
        "type": "number",
        "x-format": "currency",
        "x-currency": "USD"
      },
      "costHigh": {
        "title": "High budget scenario",
        "type": "number",
        "x-format": "currency",
        "x-currency": "USD"
      },
      "pricingStatus": {
        "title": "Pricing status",
        "type": "string",
        "x-format": "text"
      }
    }
  }
}