{
  "entity_type": "unit_conversion_page",
  "id": "ev-to-joules",
  "name": "Electronvolts to Joules",
  "title": "Electronvolts to Joules Converter (eV to J)",
  "description": "Convert electronvolts to joules: 1 eV = 1.60218e-19 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": "eV",
    "display": "eV",
    "name": "electronvolts",
    "singular": "electronvolt"
  },
  "to_unit": {
    "symbol": "J",
    "display": "J",
    "name": "joules",
    "singular": "joule"
  },
  "linear": true,
  "factor": 1.602176634e-19,
  "inverse_factor": 6241509074000000000,
  "formula": "joules = electronvolts × 1.602176634e-19",
  "reverse_formula": "electronvolts = joules × 6241509074000000000",
  "unit_relation": "1 eV = 1.60218e-19 J",
  "examples": [
    {
      "value": 5,
      "result": 8.01088e-19,
      "text": "5 eV = 8.01088e-19 J"
    },
    {
      "value": 12.5,
      "result": 2.00272e-18,
      "text": "12.5 eV = 2.00272e-18 J"
    },
    {
      "value": 100,
      "result": 1.60218e-17,
      "text": "100 eV = 1.60218e-17 J"
    }
  ],
  "table": [
    {
      "eV": 1,
      "J": 1.60218e-19
    },
    {
      "eV": 2,
      "J": 3.20435e-19
    },
    {
      "eV": 3,
      "J": 4.80653e-19
    },
    {
      "eV": 4,
      "J": 6.40871e-19
    },
    {
      "eV": 5,
      "J": 8.01088e-19
    },
    {
      "eV": 6,
      "J": 9.61306e-19
    },
    {
      "eV": 7,
      "J": 1.12152e-18
    },
    {
      "eV": 8,
      "J": 1.28174e-18
    },
    {
      "eV": 9,
      "J": 1.44196e-18
    },
    {
      "eV": 10,
      "J": 1.60218e-18
    },
    {
      "eV": 15,
      "J": 2.40326e-18
    },
    {
      "eV": 20,
      "J": 3.20435e-18
    },
    {
      "eV": 25,
      "J": 4.00544e-18
    },
    {
      "eV": 30,
      "J": 4.80653e-18
    },
    {
      "eV": 40,
      "J": 6.40871e-18
    },
    {
      "eV": 50,
      "J": 8.01088e-18
    },
    {
      "eV": 75,
      "J": 1.20163e-17
    },
    {
      "eV": 100,
      "J": 1.60218e-17
    },
    {
      "eV": 200,
      "J": 3.20435e-17
    },
    {
      "eV": 250,
      "J": 4.00544e-17
    },
    {
      "eV": 500,
      "J": 8.01088e-17
    },
    {
      "eV": 1000,
      "J": 1.60218e-16
    }
  ],
  "faq": [
    {
      "q": "How many joules are in one electronvolt?",
      "a": "1 eV = 1.60218e-19 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 electronvolts to joules?",
      "a": "Multiply the value in electronvolts by 1.602176634e-19: joules = electronvolts × 1.602176634e-19. For example, 5 eV = 8.01088e-19 J."
    },
    {
      "q": "How do I convert joules back to electronvolts?",
      "a": "Multiply by the inverse factor 6241509074000000000 (electronvolts = joules × 6241509074000000000), or use the joules-to-electronvolts 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=eV&to_unit=J",
    "calculator": "https://tttkmbb.com/api/v1/calculate/energy?value=5&from_unit=eV&to_unit=J",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "eV",
      "to_unit": "J"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/ev-to-joules",
    "markdown": "https://tttkmbb.com/conversion/ev-to-joules.md",
    "json": "https://tttkmbb.com/conversion/ev-to-joules.json",
    "reverse": "https://tttkmbb.com/conversion/joules-to-ev",
    "quantity_converter": "https://tttkmbb.com/conversion/energy",
    "units": "https://tttkmbb.com/api/v1/units?quantity=energy"
  },
  "timestamp": "2026-09-24"
}