{
  "entity_type": "unit_conversion_page",
  "id": "joules-to-ev",
  "name": "Joules to Electronvolts",
  "title": "Joules to Electronvolts Converter (J to eV)",
  "description": "Convert joules to electronvolts: 1 J = 6.24151e+18 eV. 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": "eV",
    "display": "eV",
    "name": "electronvolts",
    "singular": "electronvolt"
  },
  "linear": true,
  "factor": 6241509074000000000,
  "inverse_factor": 1.602176634e-19,
  "formula": "electronvolts = joules × 6241509074000000000",
  "reverse_formula": "joules = electronvolts × 1.602176634e-19",
  "unit_relation": "1 J = 6.24151e+18 eV",
  "examples": [
    {
      "value": 5,
      "result": 31207500000000000000,
      "text": "5 J = 3.12075e+19 eV"
    },
    {
      "value": 12.5,
      "result": 78018900000000000000,
      "text": "12.5 J = 7.80189e+19 eV"
    },
    {
      "value": 100,
      "result": 624151000000000000000,
      "text": "100 J = 6.24151e+20 eV"
    }
  ],
  "table": [
    {
      "J": 1,
      "eV": 6241510000000000000
    },
    {
      "J": 2,
      "eV": 12483000000000000000
    },
    {
      "J": 3,
      "eV": 18724500000000000000
    },
    {
      "J": 4,
      "eV": 24966000000000000000
    },
    {
      "J": 5,
      "eV": 31207500000000000000
    },
    {
      "J": 6,
      "eV": 37449100000000000000
    },
    {
      "J": 7,
      "eV": 43690600000000000000
    },
    {
      "J": 8,
      "eV": 49932100000000000000
    },
    {
      "J": 9,
      "eV": 56173600000000000000
    },
    {
      "J": 10,
      "eV": 62415100000000000000
    },
    {
      "J": 15,
      "eV": 93622600000000000000
    },
    {
      "J": 20,
      "eV": 124830000000000000000
    },
    {
      "J": 25,
      "eV": 156038000000000000000
    },
    {
      "J": 30,
      "eV": 187245000000000000000
    },
    {
      "J": 40,
      "eV": 249660000000000000000
    },
    {
      "J": 50,
      "eV": 312075000000000000000
    },
    {
      "J": 75,
      "eV": 468113000000000000000
    },
    {
      "J": 100,
      "eV": 624151000000000000000
    },
    {
      "J": 200,
      "eV": 1.2483e+21
    },
    {
      "J": 250,
      "eV": 1.56038e+21
    },
    {
      "J": 500,
      "eV": 3.12075e+21
    },
    {
      "J": 1000,
      "eV": 6.24151e+21
    }
  ],
  "faq": [
    {
      "q": "How many electronvolts are in one joule?",
      "a": "1 J = 6.24151e+18 eV. 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 electronvolts?",
      "a": "Multiply the value in joules by 6241509074000000000: electronvolts = joules × 6241509074000000000. For example, 5 J = 3.12075e+19 eV."
    },
    {
      "q": "How do I convert electronvolts back to joules?",
      "a": "Multiply by the inverse factor 1.602176634e-19 (joules = electronvolts × 1.602176634e-19), or use the electronvolts-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=eV",
    "calculator": "https://tttkmbb.com/api/v1/calculate/energy?value=5&from_unit=J&to_unit=eV",
    "mcp_tool": "convert_units",
    "mcp_arguments": {
      "value": 5,
      "from_unit": "J",
      "to_unit": "eV"
    }
  },
  "links": {
    "html": "https://tttkmbb.com/conversion/joules-to-ev",
    "markdown": "https://tttkmbb.com/conversion/joules-to-ev.md",
    "json": "https://tttkmbb.com/conversion/joules-to-ev.json",
    "reverse": "https://tttkmbb.com/conversion/ev-to-joules",
    "quantity_converter": "https://tttkmbb.com/conversion/energy",
    "units": "https://tttkmbb.com/api/v1/units?quantity=energy"
  },
  "timestamp": "2026-09-24"
}