{
  "entity_type": "unit_conversion_page",
  "id": "rankine-to-kelvin",
  "name": "Degrees Rankine to Kelvin",
  "title": "Degrees Rankine to Kelvin Converter (°R to K)",
  "description": "Convert degrees Rankine to kelvin with the formula K = °R × 5/9. Conversion table and worked examples, with JSON API and MCP access.",
  "quantity": "temperature",
  "quantity_name": "Temperature",
  "base_unit": "K",
  "from_unit": {
    "symbol": "R",
    "display": "°R",
    "name": "degrees Rankine",
    "singular": "degree Rankine"
  },
  "to_unit": {
    "symbol": "K",
    "display": "K",
    "name": "kelvin",
    "singular": "kelvin"
  },
  "linear": false,
  "factor": null,
  "inverse_factor": null,
  "formula": "K = °R × 5/9",
  "reverse_formula": "°R = K × 9/5",
  "unit_relation": "K = °R × 5/9",
  "examples": [
    {
      "value": 300,
      "result": 166.667,
      "text": "300 °R = 166.667 K"
    },
    {
      "value": 273.15,
      "result": 151.75,
      "text": "273.15 °R = 151.75 K"
    },
    {
      "value": 0,
      "result": 0,
      "text": "0 °R = 0 K"
    }
  ],
  "table": [
    {
      "R": 0,
      "K": 0
    },
    {
      "R": 50,
      "K": 27.7778
    },
    {
      "R": 100,
      "K": 55.5556
    },
    {
      "R": 150,
      "K": 83.3333
    },
    {
      "R": 200,
      "K": 111.111
    },
    {
      "R": 250,
      "K": 138.889
    },
    {
      "R": 273.15,
      "K": 151.75
    },
    {
      "R": 293.15,
      "K": 162.861
    },
    {
      "R": 300,
      "K": 166.667
    },
    {
      "R": 310,
      "K": 172.222
    },
    {
      "R": 350,
      "K": 194.444
    },
    {
      "R": 373.15,
      "K": 207.306
    },
    {
      "R": 400,
      "K": 222.222
    },
    {
      "R": 500,
      "K": 277.778
    },
    {
      "R": 600,
      "K": 333.333
    },
    {
      "R": 800,
      "K": 444.444
    },
    {
      "R": 1000,
      "K": 555.556
    },
    {
      "R": 1500,
      "K": 833.333
    },
    {
      "R": 2000,
      "K": 1111.11
    },
    {
      "R": 5000,
      "K": 2777.78
    }
  ],
  "faq": [
    {
      "q": "What is the formula to convert degrees Rankine to kelvin?",
      "a": "K = °R × 5/9. For example, 300 °R = 166.667 K."
    },
    {
      "q": "How do I convert kelvin back to degrees Rankine?",
      "a": "°R = K × 9/5; the kelvin-to-degrees Rankine page applies it directly."
    },
    {
      "q": "Why is there no single multiplication factor?",
      "a": "Temperature scales have different zero points, so the conversion is an affine formula (scale and offset), not a plain multiplication."
    }
  ],
  "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=300&from_unit=R&to_unit=K",
    "calculator": "https://tttkmbb.com/api/v1/calculate/temperature?value=300&from_unit=R&to_unit=K",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 300,
      "from_unit": "R",
      "to_unit": "K"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/rankine-to-kelvin",
    "markdown": "https://tttkmbb.com/conversion/rankine-to-kelvin.md",
    "json": "https://tttkmbb.com/conversion/rankine-to-kelvin.json",
    "reverse": "https://tttkmbb.com/conversion/kelvin-to-rankine",
    "quantity_converter": "https://tttkmbb.com/conversion/temperature",
    "units": "https://tttkmbb.com/api/v1/units?quantity=temperature"
  },
  "timestamp": "2026-09-24"
}