{
  "name": "U.S. customary units with exact metric values",
  "desc": "One row per U.S. customary unit: its customary definition, its exact metric value as a decimal and as a fraction, the year that value became exact, the document behind it, and a note where the unit was once defined with the survey foot.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "The Yardstick Almanac",
  "url": "https://theyardstickalmanac.com/units/metric-system-united-states/",
  "from": [
    "Yard and pound: National Bureau of Standards and U.S. Coast and Geodetic Survey notice, Federal Register 24 FR 5348 (July 1, 1959)",
    "Customary relations and printed decimal values: NIST Handbook 44 (2026 edition), Appendix C"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "Computed from 24 FR 5348 (1959) and the customary relations in NIST Handbook 44 (2026), Appendix C; checked against the decimals printed there, 2026-11-01, CC BY 4.0"
  ]
}