{
  "dataset": "dimmath_dim_weight_rules",
  "version": "2026-Q3",
  "generated_at": "2026-09-18T00:36:50.948Z",
  "license": "Free to use commercially with attribution to https://dimmath.com/data/",
  "total_rows": 5,
  "rows": [
    {
      "carrier": "USPS",
      "service": "Ground Advantage",
      "divisor": 139,
      "metricDivisor": 5000,
      "roundingRule": "Round each fractional side UP to whole inch before computing volume",
      "volumeThreshold": "> 1,728 in³ (1.0 cu ft)",
      "weightRounding": "Round actual and DIM weight UP to whole pound",
      "verifiedDate": "2026-07-12",
      "effectiveDate": "2026-07-12",
      "source": "USPS Notice 123 / DMM 283 §§1.4.1–1.4.2",
      "status": "Verified",
      "notes": "Divisor 139 applies strictly when volume exceeds 1 cu ft. Parcels <= 1,728 in³ bill on actual weight."
    },
    {
      "carrier": "USPS",
      "service": "Priority Mail",
      "divisor": 139,
      "metricDivisor": 5000,
      "roundingRule": "Round each fractional side UP to whole inch before computing volume",
      "volumeThreshold": "> 1,728 in³ (1.0 cu ft)",
      "weightRounding": "Round actual and DIM weight UP to whole pound",
      "verifiedDate": "2026-07-12",
      "effectiveDate": "2026-07-12",
      "source": "USPS Notice 123 / DMM 223 §1.4",
      "status": "Verified",
      "notes": "Divisor 139 applies strictly when volume exceeds 1 cu ft. Retail counter rates differ."
    },
    {
      "carrier": "UPS",
      "service": "Daily Rates (Account Ground & Air)",
      "divisor": 139,
      "metricDivisor": 5000,
      "roundingRule": "Round each fractional side UP to whole inch before computing volume (e.g. 1.1 in -> 2 in)",
      "volumeThreshold": "All packages (no volume minimum gate)",
      "weightRounding": "Round billable weight UP to whole pound",
      "verifiedDate": "2026-09-07",
      "effectiveDate": "2026-01-01",
      "source": "2026 UPS Daily Rate and Service Guide (p. 19)",
      "status": "Verified",
      "notes": "Daily account pricing divisor. Retail counter and negotiated enterprise contract divisors may vary."
    },
    {
      "carrier": "FedEx",
      "service": "Ground & Home Delivery (Domestic Model)",
      "divisor": 139,
      "metricDivisor": 5000,
      "roundingRule": "Round each fractional side UP to whole inch before computing volume",
      "volumeThreshold": "All packages (modeled baseline)",
      "weightRounding": "Round billable weight UP to whole pound",
      "verifiedDate": "2026-01-01",
      "effectiveDate": "2026-01-01",
      "source": "FedEx Published GRI Overview & Standard Divisor Spec",
      "status": "Unverified",
      "notes": "Standard 139 divisor model. Pending independent page-by-page audit against 2026 FedEx Service Guide PDF."
    },
    {
      "carrier": "Amazon",
      "service": "FBA Fulfillment (Standard & Bulky)",
      "divisor": 139,
      "metricDivisor": 5000,
      "roundingRule": "Standard dimensional calculation with size-tier specific rounding",
      "volumeThreshold": "Standard & Bulky tiers",
      "weightRounding": "Round to nearest 0.1 lb or whole lb per tier spec",
      "verifiedDate": "2026-07-22",
      "effectiveDate": "2026-01-15",
      "source": "Amazon Selling Partner News (Jan 15, 2026 FBA Schedule)",
      "status": "Verified",
      "notes": "Subject to 3.5% fuel and logistics surcharge instituted April 17, 2026."
    }
  ]
}