{
  "entity_type": "unit_conversion_page",
  "id": "days-to-weeks",
  "name": "Days to Weeks",
  "title": "Days to Weeks Converter (d to wk)",
  "description": "Convert days to weeks: 1 d = 0.142857 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": "day",
    "display": "d",
    "name": "days",
    "singular": "day"
  },
  "to_unit": {
    "symbol": "week",
    "display": "wk",
    "name": "weeks",
    "singular": "week"
  },
  "linear": true,
  "factor": 0.1428571429,
  "inverse_factor": 7,
  "formula": "weeks = days × 0.1428571429",
  "reverse_formula": "days = weeks × 7",
  "unit_relation": "1 d = 0.142857 wk",
  "examples": [
    {
      "value": 5,
      "result": 0.714286,
      "text": "5 d = 0.714286 wk"
    },
    {
      "value": 12.5,
      "result": 1.78571,
      "text": "12.5 d = 1.78571 wk"
    },
    {
      "value": 100,
      "result": 14.2857,
      "text": "100 d = 14.2857 wk"
    }
  ],
  "table": [
    {
      "day": 1,
      "week": 0.142857
    },
    {
      "day": 2,
      "week": 0.285714
    },
    {
      "day": 3,
      "week": 0.428571
    },
    {
      "day": 4,
      "week": 0.571429
    },
    {
      "day": 5,
      "week": 0.714286
    },
    {
      "day": 6,
      "week": 0.857143
    },
    {
      "day": 7,
      "week": 1
    },
    {
      "day": 8,
      "week": 1.14286
    },
    {
      "day": 9,
      "week": 1.28571
    },
    {
      "day": 10,
      "week": 1.42857
    },
    {
      "day": 15,
      "week": 2.14286
    },
    {
      "day": 20,
      "week": 2.85714
    },
    {
      "day": 25,
      "week": 3.57143
    },
    {
      "day": 30,
      "week": 4.28571
    },
    {
      "day": 40,
      "week": 5.71429
    },
    {
      "day": 50,
      "week": 7.14286
    },
    {
      "day": 75,
      "week": 10.7143
    },
    {
      "day": 100,
      "week": 14.2857
    },
    {
      "day": 200,
      "week": 28.5714
    },
    {
      "day": 250,
      "week": 35.7143
    },
    {
      "day": 500,
      "week": 71.4286
    },
    {
      "day": 1000,
      "week": 142.857
    }
  ],
  "faq": [
    {
      "q": "How many weeks are in one day?",
      "a": "1 d = 0.142857 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 days to weeks?",
      "a": "Multiply the value in days by 0.1428571429: weeks = days × 0.1428571429. For example, 5 d = 0.714286 wk."
    },
    {
      "q": "How do I convert weeks back to days?",
      "a": "Multiply by the inverse factor 7 (days = weeks × 7), or use the weeks-to-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=day&to_unit=week",
    "calculator": "https://tttkmbb.com/api/v1/calculate/time?value=5&from_unit=day&to_unit=week",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "day",
      "to_unit": "week"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/days-to-weeks",
    "markdown": "https://tttkmbb.com/conversion/days-to-weeks.md",
    "json": "https://tttkmbb.com/conversion/days-to-weeks.json",
    "reverse": "https://tttkmbb.com/conversion/weeks-to-days",
    "quantity_converter": "https://tttkmbb.com/conversion/time",
    "units": "https://tttkmbb.com/api/v1/units?quantity=time"
  },
  "timestamp": "2026-09-24"
}