{
  "entity_type": "unit_conversion_page",
  "id": "btu-to-kj",
  "name": "BTU to Kilojoules",
  "title": "BTU to Kilojoules Converter (BTU to kJ)",
  "description": "Convert BTU to kilojoules: 1 BTU = 1.05506 kJ. 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": "kJ",
    "display": "kJ",
    "name": "kilojoules",
    "singular": "kilojoule"
  },
  "linear": true,
  "factor": 1.055055853,
  "inverse_factor": 0.9478171203,
  "formula": "kilojoules = BTU × 1.055055853",
  "reverse_formula": "BTU = kilojoules × 0.9478171203",
  "unit_relation": "1 BTU = 1.05506 kJ",
  "examples": [
    {
      "value": 5,
      "result": 5.27528,
      "text": "5 BTU = 5.27528 kJ"
    },
    {
      "value": 12.5,
      "result": 13.1882,
      "text": "12.5 BTU = 13.1882 kJ"
    },
    {
      "value": 100,
      "result": 105.506,
      "text": "100 BTU = 105.506 kJ"
    }
  ],
  "table": [
    {
      "BTU": 1,
      "kJ": 1.05506
    },
    {
      "BTU": 2,
      "kJ": 2.11011
    },
    {
      "BTU": 3,
      "kJ": 3.16517
    },
    {
      "BTU": 4,
      "kJ": 4.22022
    },
    {
      "BTU": 5,
      "kJ": 5.27528
    },
    {
      "BTU": 6,
      "kJ": 6.33034
    },
    {
      "BTU": 7,
      "kJ": 7.38539
    },
    {
      "BTU": 8,
      "kJ": 8.44045
    },
    {
      "BTU": 9,
      "kJ": 9.4955
    },
    {
      "BTU": 10,
      "kJ": 10.5506
    },
    {
      "BTU": 15,
      "kJ": 15.8258
    },
    {
      "BTU": 20,
      "kJ": 21.1011
    },
    {
      "BTU": 25,
      "kJ": 26.3764
    },
    {
      "BTU": 30,
      "kJ": 31.6517
    },
    {
      "BTU": 40,
      "kJ": 42.2022
    },
    {
      "BTU": 50,
      "kJ": 52.7528
    },
    {
      "BTU": 75,
      "kJ": 79.1292
    },
    {
      "BTU": 100,
      "kJ": 105.506
    },
    {
      "BTU": 200,
      "kJ": 211.011
    },
    {
      "BTU": 250,
      "kJ": 263.764
    },
    {
      "BTU": 500,
      "kJ": 527.528
    },
    {
      "BTU": 1000,
      "kJ": 1055.06
    }
  ],
  "faq": [
    {
      "q": "How many kilojoules are in one BTU?",
      "a": "1 BTU = 1.05506 kJ. 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 kilojoules?",
      "a": "Multiply the value in BTU by 1.055055853: kilojoules = BTU × 1.055055853. For example, 5 BTU = 5.27528 kJ."
    },
    {
      "q": "How do I convert kilojoules back to BTU?",
      "a": "Multiply by the inverse factor 0.9478171203 (BTU = kilojoules × 0.9478171203), or use the kilojoules-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=kJ",
    "calculator": "https://tttkmbb.com/api/v1/calculate/energy?value=5&from_unit=BTU&to_unit=kJ",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "BTU",
      "to_unit": "kJ"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/btu-to-kj",
    "markdown": "https://tttkmbb.com/conversion/btu-to-kj.md",
    "json": "https://tttkmbb.com/conversion/btu-to-kj.json",
    "reverse": "https://tttkmbb.com/conversion/kj-to-btu",
    "quantity_converter": "https://tttkmbb.com/conversion/energy",
    "units": "https://tttkmbb.com/api/v1/units?quantity=energy"
  },
  "timestamp": "2026-09-24"
}