{
  "entity_type": "unit_conversion_page",
  "id": "years-to-weeks",
  "name": "Years (365 days) to Weeks",
  "title": "Years (365 days) to Weeks Converter (yr to wk)",
  "description": "Convert years (365 days) to weeks: 1 yr = 52.1429 wk. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.",
  "quantity": "time",
  "quantity_name": "Time",
  "base_unit": "s",
  "from_unit": {
    "symbol": "year_365",
    "display": "yr",
    "name": "years (365 days)",
    "singular": "year"
  },
  "to_unit": {
    "symbol": "week",
    "display": "wk",
    "name": "weeks",
    "singular": "week"
  },
  "linear": true,
  "factor": 52.14285714,
  "inverse_factor": 0.01917808219,
  "formula": "weeks = years (365 days) × 52.14285714",
  "reverse_formula": "years (365 days) = weeks × 0.01917808219",
  "unit_relation": "1 yr = 52.1429 wk",
  "examples": [
    {
      "value": 5,
      "result": 260.714,
      "text": "5 yr = 260.714 wk"
    },
    {
      "value": 12.5,
      "result": 651.786,
      "text": "12.5 yr = 651.786 wk"
    },
    {
      "value": 100,
      "result": 5214.29,
      "text": "100 yr = 5214.29 wk"
    }
  ],
  "table": [
    {
      "year_365": 1,
      "week": 52.1429
    },
    {
      "year_365": 2,
      "week": 104.286
    },
    {
      "year_365": 3,
      "week": 156.429
    },
    {
      "year_365": 4,
      "week": 208.571
    },
    {
      "year_365": 5,
      "week": 260.714
    },
    {
      "year_365": 6,
      "week": 312.857
    },
    {
      "year_365": 7,
      "week": 365
    },
    {
      "year_365": 8,
      "week": 417.143
    },
    {
      "year_365": 9,
      "week": 469.286
    },
    {
      "year_365": 10,
      "week": 521.429
    },
    {
      "year_365": 15,
      "week": 782.143
    },
    {
      "year_365": 20,
      "week": 1042.86
    },
    {
      "year_365": 25,
      "week": 1303.57
    },
    {
      "year_365": 30,
      "week": 1564.29
    },
    {
      "year_365": 40,
      "week": 2085.71
    },
    {
      "year_365": 50,
      "week": 2607.14
    },
    {
      "year_365": 75,
      "week": 3910.71
    },
    {
      "year_365": 100,
      "week": 5214.29
    },
    {
      "year_365": 200,
      "week": 10428.6
    },
    {
      "year_365": 250,
      "week": 13035.7
    },
    {
      "year_365": 500,
      "week": 26071.4
    },
    {
      "year_365": 1000,
      "week": 52142.9
    }
  ],
  "faq": [
    {
      "q": "How many weeks are in one year?",
      "a": "1 yr = 52.1429 wk. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures."
    },
    {
      "q": "What is the formula to convert years (365 days) to weeks?",
      "a": "Multiply the value in years (365 days) by 52.14285714: weeks = years (365 days) × 52.14285714. For example, 5 yr = 260.714 wk."
    },
    {
      "q": "How do I convert weeks back to years (365 days)?",
      "a": "Multiply by the inverse factor 0.01917808219 (years (365 days) = weeks × 0.01917808219), or use the weeks-to-years (365 days) page."
    }
  ],
  "sources": [
    {
      "name": "NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors",
      "url": "https://www.nist.gov/pml/special-publication-811",
      "type": "standard",
      "retrieved_at": "2026-09-24"
    },
    {
      "name": "BIPM – The International System of Units (SI Brochure, 9th edition)",
      "url": "https://www.bipm.org/en/publications/si-brochure",
      "type": "standard",
      "retrieved_at": "2026-09-24"
    },
    {
      "name": "Wikipedia – Conversion of units",
      "url": "https://en.wikipedia.org/wiki/Conversion_of_units",
      "type": "reference",
      "retrieved_at": "2026-09-24"
    }
  ],
  "freshness": {
    "type": "static",
    "max_age_seconds": null,
    "note": "Fixed conversion factors (NIST/BIPM definitions); results never go stale."
  },
  "api": {
    "convert": "https://tttkmbb.com/api/v1/convert?value=5&from_unit=year_365&to_unit=week",
    "calculator": "https://tttkmbb.com/api/v1/calculate/time?value=5&from_unit=year_365&to_unit=week",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "year_365",
      "to_unit": "week"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/years-to-weeks",
    "markdown": "https://tttkmbb.com/conversion/years-to-weeks.md",
    "json": "https://tttkmbb.com/conversion/years-to-weeks.json",
    "reverse": "https://tttkmbb.com/conversion/weeks-to-years",
    "quantity_converter": "https://tttkmbb.com/conversion/time",
    "units": "https://tttkmbb.com/api/v1/units?quantity=time"
  },
  "timestamp": "2026-09-24"
}