{
  "dataset_id": "interior-measurement-reference",
  "version": "1.0.0",
  "description": "Twelve deterministic unit-conversion records for reading furniture drawings. Exact arithmetic references, not standard furniture sizes, manufacturing tolerances or a measurement survey.",
  "method": "Deterministic formulas; inputs are labelled examples or unit definitions. Results serialized to at most 12 decimal places. No measured sample.",
  "source": {
    "id": "NIST-LENGTH",
    "title": "SI Units - Length",
    "publisher": "National Institute of Standards and Technology",
    "url": "https://www.nist.gov/pml/owm/si-units-length",
    "accessed_at": "2026-09-06",
    "supports": "The inch is exactly 25.4 mm; metric length relations and the distinction between length, area and volume.",
    "does_not_support": "Furniture size recommendations, installation clearances, prices, tolerances, measured projects or contractual measurement rules."
  },
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "records": [
    {
      "id": "DIM-001",
      "context": "Inch definition",
      "operation": "inch_mm",
      "inputs": [
        1
      ],
      "unit": "mm",
      "limitation": "Unit definition, not measurement accuracy.",
      "result": 25.4,
      "formula": "input_inches * 25.4",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    },
    {
      "id": "DIM-002",
      "context": "Foot to millimetres",
      "operation": "foot_mm",
      "inputs": [
        1
      ],
      "unit": "mm",
      "limitation": "International foot; no rounding allowance implied.",
      "result": 304.8,
      "formula": "input_feet * 12 * 25.4",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    },
    {
      "id": "DIM-003",
      "context": "Foot to metres",
      "operation": "foot_m",
      "inputs": [
        1
      ],
      "unit": "m",
      "limitation": "Length conversion only; do not apply to area rates.",
      "result": 0.3048,
      "formula": "input_feet * 0.3048",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    },
    {
      "id": "DIM-004",
      "context": "Square foot to square metres",
      "operation": "sqfoot_sqm",
      "inputs": [
        1
      ],
      "unit": "sq_m",
      "limitation": "Area conversion does not define which surface is charged.",
      "result": 0.09290304,
      "formula": "input_square_feet * 0.3048^2",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    },
    {
      "id": "DIM-005",
      "context": "Cubic foot to cubic metres",
      "operation": "cufoot_cum",
      "inputs": [
        1
      ],
      "unit": "cu_m",
      "limitation": "Volume conversion does not define rough-stock versus finished billing.",
      "result": 0.028316846592,
      "formula": "input_cubic_feet * 0.3048^3",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    },
    {
      "id": "DIM-006",
      "context": "Millimetres to feet",
      "operation": "mm_foot",
      "inputs": [
        304.8
      ],
      "unit": "ft",
      "limitation": "Example chosen for an exact integer result, not a fit clearance.",
      "result": 1,
      "formula": "input_millimetres / 304.8",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    },
    {
      "id": "DIM-007",
      "context": "An 18-inch drawing dimension",
      "operation": "inch_mm",
      "inputs": [
        18
      ],
      "unit": "mm",
      "limitation": "Illustrative labelled dimension, not a recommended table height.",
      "result": 457.2,
      "formula": "input_inches * 25.4",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    },
    {
      "id": "DIM-008",
      "context": "A 24-inch drawing dimension",
      "operation": "inch_mm",
      "inputs": [
        24
      ],
      "unit": "mm",
      "limitation": "Not a universal appliance bay width.",
      "result": 609.6,
      "formula": "input_inches * 25.4",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    },
    {
      "id": "DIM-009",
      "context": "A 48-inch drawing dimension",
      "operation": "inch_mm",
      "inputs": [
        48
      ],
      "unit": "mm",
      "limitation": "Not a mandatory center-table length.",
      "result": 1219.2,
      "formula": "input_inches * 25.4",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    },
    {
      "id": "DIM-010",
      "context": "A 60-inch drawing dimension",
      "operation": "inch_mm",
      "inputs": [
        60
      ],
      "unit": "mm",
      "limitation": "Not a guaranteed queen mattress or bed-frame size.",
      "result": 1524,
      "formula": "input_inches * 25.4",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    },
    {
      "id": "DIM-011",
      "context": "A 72-inch drawing dimension",
      "operation": "inch_mm",
      "inputs": [
        72
      ],
      "unit": "mm",
      "limitation": "Confirm actual mattress and outside frame dimensions separately.",
      "result": 1828.8,
      "formula": "input_inches * 25.4",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    },
    {
      "id": "DIM-012",
      "context": "A 78-inch drawing dimension",
      "operation": "inch_mm",
      "inputs": [
        78
      ],
      "unit": "mm",
      "limitation": "Do not replace the manufacturer drawing with a rounded catalogue label.",
      "result": 1981.2,
      "formula": "input_inches * 25.4",
      "evidence_grade": "D",
      "claim_type": "transparent_calculation",
      "source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "reviewed_at": "2026-09-06"
    }
  ]
}