{
  "entity_type": "unit_conversion_page",
  "id": "fahrenheit-to-celsius",
  "name": "Degrees Fahrenheit to Degrees Celsius",
  "title": "Degrees Fahrenheit to Degrees Celsius Converter (°F to °C)",
  "description": "Convert degrees Fahrenheit to degrees Celsius with the formula °C = (°F − 32) × 5/9. Conversion table and worked examples, with JSON API and MCP access.",
  "quantity": "temperature",
  "quantity_name": "Temperature",
  "base_unit": "K",
  "from_unit": {
    "symbol": "F",
    "display": "°F",
    "name": "degrees Fahrenheit",
    "singular": "degree Fahrenheit"
  },
  "to_unit": {
    "symbol": "C",
    "display": "°C",
    "name": "degrees Celsius",
    "singular": "degree Celsius"
  },
  "linear": false,
  "factor": null,
  "inverse_factor": null,
  "formula": "°C = (°F − 32) × 5/9",
  "reverse_formula": "°F = °C × 9/5 + 32",
  "unit_relation": "°C = (°F − 32) × 5/9",
  "examples": [
    {
      "value": 37,
      "result": 2.77778,
      "text": "37 °F = 2.77778 °C"
    },
    {
      "value": 100,
      "result": 37.7778,
      "text": "100 °F = 37.7778 °C"
    },
    {
      "value": -40,
      "result": -40,
      "text": "-40 °F = -40 °C"
    }
  ],
  "table": [
    {
      "F": -40,
      "C": -40
    },
    {
      "F": -30,
      "C": -34.4444
    },
    {
      "F": -20,
      "C": -28.8889
    },
    {
      "F": -10,
      "C": -23.3333
    },
    {
      "F": 0,
      "C": -17.7778
    },
    {
      "F": 5,
      "C": -15
    },
    {
      "F": 10,
      "C": -12.2222
    },
    {
      "F": 15,
      "C": -9.44444
    },
    {
      "F": 20,
      "C": -6.66667
    },
    {
      "F": 25,
      "C": -3.88889
    },
    {
      "F": 30,
      "C": -1.11111
    },
    {
      "F": 35,
      "C": 1.66667
    },
    {
      "F": 37,
      "C": 2.77778
    },
    {
      "F": 40,
      "C": 4.44444
    },
    {
      "F": 50,
      "C": 10
    },
    {
      "F": 60,
      "C": 15.5556
    },
    {
      "F": 70,
      "C": 21.1111
    },
    {
      "F": 80,
      "C": 26.6667
    },
    {
      "F": 90,
      "C": 32.2222
    },
    {
      "F": 100,
      "C": 37.7778
    },
    {
      "F": 150,
      "C": 65.5556
    },
    {
      "F": 200,
      "C": 93.3333
    }
  ],
  "faq": [
    {
      "q": "What is the formula to convert degrees Fahrenheit to degrees Celsius?",
      "a": "°C = (°F − 32) × 5/9. For example, 37 °F = 2.77778 °C."
    },
    {
      "q": "How do I convert degrees Celsius back to degrees Fahrenheit?",
      "a": "°F = °C × 9/5 + 32; the degrees Celsius-to-degrees Fahrenheit 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=37&from_unit=F&to_unit=C",
    "calculator": "https://tttkmbb.com/api/v1/calculate/temperature?value=37&from_unit=F&to_unit=C",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 37,
      "from_unit": "F",
      "to_unit": "C"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/fahrenheit-to-celsius",
    "markdown": "https://tttkmbb.com/conversion/fahrenheit-to-celsius.md",
    "json": "https://tttkmbb.com/conversion/fahrenheit-to-celsius.json",
    "reverse": "https://tttkmbb.com/conversion/celsius-to-fahrenheit",
    "quantity_converter": "https://tttkmbb.com/conversion/temperature",
    "units": "https://tttkmbb.com/api/v1/units?quantity=temperature"
  },
  "timestamp": "2026-09-24"
}