{
  "entity_type": "unit_conversion_page",
  "id": "btu-to-joules",
  "name": "BTU to Joules",
  "title": "BTU to Joules Converter (BTU to J)",
  "description": "Convert BTU to joules: 1 BTU = 1055.06 J. 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": "BTU",
    "display": "BTU",
    "name": "BTU",
    "singular": "BTU"
  },
  "to_unit": {
    "symbol": "J",
    "display": "J",
    "name": "joules",
    "singular": "joule"
  },
  "linear": true,
  "factor": 1055.055853,
  "inverse_factor": 0.0009478171203,
  "formula": "joules = BTU × 1055.055853",
  "reverse_formula": "BTU = joules × 0.0009478171203",
  "unit_relation": "1 BTU = 1055.06 J",
  "examples": [
    {
      "value": 5,
      "result": 5275.28,
      "text": "5 BTU = 5275.28 J"
    },
    {
      "value": 12.5,
      "result": 13188.2,
      "text": "12.5 BTU = 13188.2 J"
    },
    {
      "value": 100,
      "result": 105506,
      "text": "100 BTU = 105506 J"
    }
  ],
  "table": [
    {
      "BTU": 1,
      "J": 1055.06
    },
    {
      "BTU": 2,
      "J": 2110.11
    },
    {
      "BTU": 3,
      "J": 3165.17
    },
    {
      "BTU": 4,
      "J": 4220.22
    },
    {
      "BTU": 5,
      "J": 5275.28
    },
    {
      "BTU": 6,
      "J": 6330.34
    },
    {
      "BTU": 7,
      "J": 7385.39
    },
    {
      "BTU": 8,
      "J": 8440.45
    },
    {
      "BTU": 9,
      "J": 9495.5
    },
    {
      "BTU": 10,
      "J": 10550.6
    },
    {
      "BTU": 15,
      "J": 15825.8
    },
    {
      "BTU": 20,
      "J": 21101.1
    },
    {
      "BTU": 25,
      "J": 26376.4
    },
    {
      "BTU": 30,
      "J": 31651.7
    },
    {
      "BTU": 40,
      "J": 42202.2
    },
    {
      "BTU": 50,
      "J": 52752.8
    },
    {
      "BTU": 75,
      "J": 79129.2
    },
    {
      "BTU": 100,
      "J": 105506
    },
    {
      "BTU": 200,
      "J": 211011
    },
    {
      "BTU": 250,
      "J": 263764
    },
    {
      "BTU": 500,
      "J": 527528
    },
    {
      "BTU": 1000,
      "J": 1055060
    }
  ],
  "faq": [
    {
      "q": "How many joules are in one BTU?",
      "a": "1 BTU = 1055.06 J. 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 BTU to joules?",
      "a": "Multiply the value in BTU by 1055.055853: joules = BTU × 1055.055853. For example, 5 BTU = 5275.28 J."
    },
    {
      "q": "How do I convert joules back to BTU?",
      "a": "Multiply by the inverse factor 0.0009478171203 (BTU = joules × 0.0009478171203), or use the joules-to-BTU 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=BTU&to_unit=J",
    "calculator": "https://tttkmbb.com/api/v1/calculate/energy?value=5&from_unit=BTU&to_unit=J",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "BTU",
      "to_unit": "J"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/btu-to-joules",
    "markdown": "https://tttkmbb.com/conversion/btu-to-joules.md",
    "json": "https://tttkmbb.com/conversion/btu-to-joules.json",
    "reverse": "https://tttkmbb.com/conversion/joules-to-btu",
    "quantity_converter": "https://tttkmbb.com/conversion/energy",
    "units": "https://tttkmbb.com/api/v1/units?quantity=energy"
  },
  "timestamp": "2026-09-24"
}