{
  "entity_type": "unit_conversion_page",
  "id": "joules-to-btu",
  "name": "Joules to BTU",
  "title": "Joules to BTU Converter (J to BTU)",
  "description": "Convert joules to BTU: 1 J = 0.000947817 BTU. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.",
  "quantity": "energy",
  "quantity_name": "Energy",
  "base_unit": "J",
  "from_unit": {
    "symbol": "J",
    "display": "J",
    "name": "joules",
    "singular": "joule"
  },
  "to_unit": {
    "symbol": "BTU",
    "display": "BTU",
    "name": "BTU",
    "singular": "BTU"
  },
  "linear": true,
  "factor": 0.0009478171203,
  "inverse_factor": 1055.055853,
  "formula": "BTU = joules × 0.0009478171203",
  "reverse_formula": "joules = BTU × 1055.055853",
  "unit_relation": "1 J = 0.000947817 BTU",
  "examples": [
    {
      "value": 5,
      "result": 0.00473909,
      "text": "5 J = 0.00473909 BTU"
    },
    {
      "value": 12.5,
      "result": 0.0118477,
      "text": "12.5 J = 0.0118477 BTU"
    },
    {
      "value": 100,
      "result": 0.0947817,
      "text": "100 J = 0.0947817 BTU"
    }
  ],
  "table": [
    {
      "J": 1,
      "BTU": 0.000947817
    },
    {
      "J": 2,
      "BTU": 0.00189563
    },
    {
      "J": 3,
      "BTU": 0.00284345
    },
    {
      "J": 4,
      "BTU": 0.00379127
    },
    {
      "J": 5,
      "BTU": 0.00473909
    },
    {
      "J": 6,
      "BTU": 0.0056869
    },
    {
      "J": 7,
      "BTU": 0.00663472
    },
    {
      "J": 8,
      "BTU": 0.00758254
    },
    {
      "J": 9,
      "BTU": 0.00853035
    },
    {
      "J": 10,
      "BTU": 0.00947817
    },
    {
      "J": 15,
      "BTU": 0.0142173
    },
    {
      "J": 20,
      "BTU": 0.0189563
    },
    {
      "J": 25,
      "BTU": 0.0236954
    },
    {
      "J": 30,
      "BTU": 0.0284345
    },
    {
      "J": 40,
      "BTU": 0.0379127
    },
    {
      "J": 50,
      "BTU": 0.0473909
    },
    {
      "J": 75,
      "BTU": 0.0710863
    },
    {
      "J": 100,
      "BTU": 0.0947817
    },
    {
      "J": 200,
      "BTU": 0.189563
    },
    {
      "J": 250,
      "BTU": 0.236954
    },
    {
      "J": 500,
      "BTU": 0.473909
    },
    {
      "J": 1000,
      "BTU": 0.947817
    }
  ],
  "faq": [
    {
      "q": "How many BTU are in one joule?",
      "a": "1 J = 0.000947817 BTU. 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 joules to BTU?",
      "a": "Multiply the value in joules by 0.0009478171203: BTU = joules × 0.0009478171203. For example, 5 J = 0.00473909 BTU."
    },
    {
      "q": "How do I convert BTU back to joules?",
      "a": "Multiply by the inverse factor 1055.055853 (joules = BTU × 1055.055853), or use the BTU-to-joules 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=J&to_unit=BTU",
    "calculator": "https://tttkmbb.com/api/v1/calculate/energy?value=5&from_unit=J&to_unit=BTU",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "J",
      "to_unit": "BTU"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/joules-to-btu",
    "markdown": "https://tttkmbb.com/conversion/joules-to-btu.md",
    "json": "https://tttkmbb.com/conversion/joules-to-btu.json",
    "reverse": "https://tttkmbb.com/conversion/btu-to-joules",
    "quantity_converter": "https://tttkmbb.com/conversion/energy",
    "units": "https://tttkmbb.com/api/v1/units?quantity=energy"
  },
  "timestamp": "2026-09-24"
}