{
  "entity_type": "unit_conversion_page",
  "id": "wh-to-joules",
  "name": "Watt-hours to Joules",
  "title": "Watt-hours to Joules Converter (Wh to J)",
  "description": "Convert watt-hours to joules: 1 Wh = 3600 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": "Wh",
    "display": "Wh",
    "name": "watt-hours",
    "singular": "watt-hour"
  },
  "to_unit": {
    "symbol": "J",
    "display": "J",
    "name": "joules",
    "singular": "joule"
  },
  "linear": true,
  "factor": 3600,
  "inverse_factor": 0.0002777777778,
  "formula": "joules = watt-hours × 3600",
  "reverse_formula": "watt-hours = joules × 0.0002777777778",
  "unit_relation": "1 Wh = 3600 J",
  "examples": [
    {
      "value": 5,
      "result": 18000,
      "text": "5 Wh = 18000 J"
    },
    {
      "value": 12.5,
      "result": 45000,
      "text": "12.5 Wh = 45000 J"
    },
    {
      "value": 100,
      "result": 360000,
      "text": "100 Wh = 360000 J"
    }
  ],
  "table": [
    {
      "Wh": 1,
      "J": 3600
    },
    {
      "Wh": 2,
      "J": 7200
    },
    {
      "Wh": 3,
      "J": 10800
    },
    {
      "Wh": 4,
      "J": 14400
    },
    {
      "Wh": 5,
      "J": 18000
    },
    {
      "Wh": 6,
      "J": 21600
    },
    {
      "Wh": 7,
      "J": 25200
    },
    {
      "Wh": 8,
      "J": 28800
    },
    {
      "Wh": 9,
      "J": 32400
    },
    {
      "Wh": 10,
      "J": 36000
    },
    {
      "Wh": 15,
      "J": 54000
    },
    {
      "Wh": 20,
      "J": 72000
    },
    {
      "Wh": 25,
      "J": 90000
    },
    {
      "Wh": 30,
      "J": 108000
    },
    {
      "Wh": 40,
      "J": 144000
    },
    {
      "Wh": 50,
      "J": 180000
    },
    {
      "Wh": 75,
      "J": 270000
    },
    {
      "Wh": 100,
      "J": 360000
    },
    {
      "Wh": 200,
      "J": 720000
    },
    {
      "Wh": 250,
      "J": 900000
    },
    {
      "Wh": 500,
      "J": 1800000
    },
    {
      "Wh": 1000,
      "J": 3600000
    }
  ],
  "faq": [
    {
      "q": "How many joules are in one watt-hour?",
      "a": "1 Wh = 3600 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 watt-hours to joules?",
      "a": "Multiply the value in watt-hours by 3600: joules = watt-hours × 3600. For example, 5 Wh = 18000 J."
    },
    {
      "q": "How do I convert joules back to watt-hours?",
      "a": "Multiply by the inverse factor 0.0002777777778 (watt-hours = joules × 0.0002777777778), or use the joules-to-watt-hours 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=Wh&to_unit=J",
    "calculator": "https://tttkmbb.com/api/v1/calculate/energy?value=5&from_unit=Wh&to_unit=J",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "Wh",
      "to_unit": "J"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/wh-to-joules",
    "markdown": "https://tttkmbb.com/conversion/wh-to-joules.md",
    "json": "https://tttkmbb.com/conversion/wh-to-joules.json",
    "reverse": "https://tttkmbb.com/conversion/joules-to-wh",
    "quantity_converter": "https://tttkmbb.com/conversion/energy",
    "units": "https://tttkmbb.com/api/v1/units?quantity=energy"
  },
  "timestamp": "2026-09-24"
}