{
  "entity_type": "unit_conversion_page",
  "id": "hours-to-days",
  "name": "Hours to Days",
  "title": "Hours to Days Converter (h to d)",
  "description": "Convert hours to days: 1 h = 0.0416667 d. 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": "h",
    "display": "h",
    "name": "hours",
    "singular": "hour"
  },
  "to_unit": {
    "symbol": "day",
    "display": "d",
    "name": "days",
    "singular": "day"
  },
  "linear": true,
  "factor": 0.04166666667,
  "inverse_factor": 24,
  "formula": "days = hours × 0.04166666667",
  "reverse_formula": "hours = days × 24",
  "unit_relation": "1 h = 0.0416667 d",
  "examples": [
    {
      "value": 5,
      "result": 0.208333,
      "text": "5 h = 0.208333 d"
    },
    {
      "value": 12.5,
      "result": 0.520833,
      "text": "12.5 h = 0.520833 d"
    },
    {
      "value": 100,
      "result": 4.16667,
      "text": "100 h = 4.16667 d"
    }
  ],
  "table": [
    {
      "h": 1,
      "day": 0.0416667
    },
    {
      "h": 2,
      "day": 0.0833333
    },
    {
      "h": 3,
      "day": 0.125
    },
    {
      "h": 4,
      "day": 0.166667
    },
    {
      "h": 5,
      "day": 0.208333
    },
    {
      "h": 6,
      "day": 0.25
    },
    {
      "h": 7,
      "day": 0.291667
    },
    {
      "h": 8,
      "day": 0.333333
    },
    {
      "h": 9,
      "day": 0.375
    },
    {
      "h": 10,
      "day": 0.416667
    },
    {
      "h": 15,
      "day": 0.625
    },
    {
      "h": 20,
      "day": 0.833333
    },
    {
      "h": 25,
      "day": 1.04167
    },
    {
      "h": 30,
      "day": 1.25
    },
    {
      "h": 40,
      "day": 1.66667
    },
    {
      "h": 50,
      "day": 2.08333
    },
    {
      "h": 75,
      "day": 3.125
    },
    {
      "h": 100,
      "day": 4.16667
    },
    {
      "h": 200,
      "day": 8.33333
    },
    {
      "h": 250,
      "day": 10.4167
    },
    {
      "h": 500,
      "day": 20.8333
    },
    {
      "h": 1000,
      "day": 41.6667
    }
  ],
  "faq": [
    {
      "q": "How many days are in one hour?",
      "a": "1 h = 0.0416667 d. 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 hours to days?",
      "a": "Multiply the value in hours by 0.04166666667: days = hours × 0.04166666667. For example, 5 h = 0.208333 d."
    },
    {
      "q": "How do I convert days back to hours?",
      "a": "Multiply by the inverse factor 24 (hours = days × 24), or use the days-to-hours 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=h&to_unit=day",
    "calculator": "https://tttkmbb.com/api/v1/calculate/time?value=5&from_unit=h&to_unit=day",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "h",
      "to_unit": "day"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/hours-to-days",
    "markdown": "https://tttkmbb.com/conversion/hours-to-days.md",
    "json": "https://tttkmbb.com/conversion/hours-to-days.json",
    "reverse": "https://tttkmbb.com/conversion/days-to-hours",
    "quantity_converter": "https://tttkmbb.com/conversion/time",
    "units": "https://tttkmbb.com/api/v1/units?quantity=time"
  },
  "timestamp": "2026-09-24"
}