{
  "entity_type": "unit_conversion_page",
  "id": "joules-to-kwh",
  "name": "Joules to Kilowatt-hours",
  "title": "Joules to Kilowatt-hours Converter (J to kWh)",
  "description": "Convert joules to kilowatt-hours: 1 J = 2.77778e-7 kWh. 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": "kWh",
    "display": "kWh",
    "name": "kilowatt-hours",
    "singular": "kilowatt-hour"
  },
  "linear": true,
  "factor": 2.777777778e-7,
  "inverse_factor": 3600000,
  "formula": "kilowatt-hours = joules × 2.777777778e-7",
  "reverse_formula": "joules = kilowatt-hours × 3600000",
  "unit_relation": "1 J = 2.77778e-7 kWh",
  "examples": [
    {
      "value": 5,
      "result": 0.00000138889,
      "text": "5 J = 0.00000138889 kWh"
    },
    {
      "value": 12.5,
      "result": 0.00000347222,
      "text": "12.5 J = 0.00000347222 kWh"
    },
    {
      "value": 100,
      "result": 0.0000277778,
      "text": "100 J = 0.0000277778 kWh"
    }
  ],
  "table": [
    {
      "J": 1,
      "kWh": 2.77778e-7
    },
    {
      "J": 2,
      "kWh": 5.55556e-7
    },
    {
      "J": 3,
      "kWh": 8.33333e-7
    },
    {
      "J": 4,
      "kWh": 0.00000111111
    },
    {
      "J": 5,
      "kWh": 0.00000138889
    },
    {
      "J": 6,
      "kWh": 0.00000166667
    },
    {
      "J": 7,
      "kWh": 0.00000194444
    },
    {
      "J": 8,
      "kWh": 0.00000222222
    },
    {
      "J": 9,
      "kWh": 0.0000025
    },
    {
      "J": 10,
      "kWh": 0.00000277778
    },
    {
      "J": 15,
      "kWh": 0.00000416667
    },
    {
      "J": 20,
      "kWh": 0.00000555556
    },
    {
      "J": 25,
      "kWh": 0.00000694444
    },
    {
      "J": 30,
      "kWh": 0.00000833333
    },
    {
      "J": 40,
      "kWh": 0.0000111111
    },
    {
      "J": 50,
      "kWh": 0.0000138889
    },
    {
      "J": 75,
      "kWh": 0.0000208333
    },
    {
      "J": 100,
      "kWh": 0.0000277778
    },
    {
      "J": 200,
      "kWh": 0.0000555556
    },
    {
      "J": 250,
      "kWh": 0.0000694444
    },
    {
      "J": 500,
      "kWh": 0.000138889
    },
    {
      "J": 1000,
      "kWh": 0.000277778
    }
  ],
  "faq": [
    {
      "q": "How many kilowatt-hours are in one joule?",
      "a": "1 J = 2.77778e-7 kWh. 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 kilowatt-hours?",
      "a": "Multiply the value in joules by 2.777777778e-7: kilowatt-hours = joules × 2.777777778e-7. For example, 5 J = 0.00000138889 kWh."
    },
    {
      "q": "How do I convert kilowatt-hours back to joules?",
      "a": "Multiply by the inverse factor 3600000 (joules = kilowatt-hours × 3600000), or use the kilowatt-hours-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=kWh",
    "calculator": "https://tttkmbb.com/api/v1/calculate/energy?value=5&from_unit=J&to_unit=kWh",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "J",
      "to_unit": "kWh"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/joules-to-kwh",
    "markdown": "https://tttkmbb.com/conversion/joules-to-kwh.md",
    "json": "https://tttkmbb.com/conversion/joules-to-kwh.json",
    "reverse": "https://tttkmbb.com/conversion/kwh-to-joules",
    "quantity_converter": "https://tttkmbb.com/conversion/energy",
    "units": "https://tttkmbb.com/api/v1/units?quantity=energy"
  },
  "timestamp": "2026-09-24"
}