Home › Unit Conversion › Joules to Electronvolts
Joules to Electronvolts (J to eV)
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.
Formula
1 J = 6.24151e+18 eV
electronvolts = joules × 6241509074000000000 — reverse: joules = electronvolts × 1.602176634e-19
The factor is derived from the SI definitions of both units (base unit: J) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 J = 3.12075e+19 eV
- 12.5 J = 7.80189e+19 eV
- 100 J = 6.24151e+20 eV
Joules to electronvolts conversion table
| Joules (J) | Electronvolts (eV) |
|---|---|
| 1 | 6.24151e+18 |
| 2 | 1.2483e+19 |
| 3 | 1.87245e+19 |
| 4 | 2.4966e+19 |
| 5 | 3.12075e+19 |
| 6 | 3.74491e+19 |
| 7 | 4.36906e+19 |
| 8 | 4.99321e+19 |
| 9 | 5.61736e+19 |
| 10 | 6.24151e+19 |
| 15 | 9.36226e+19 |
| 20 | 1.2483e+20 |
| 25 | 1.56038e+20 |
| 30 | 1.87245e+20 |
| 40 | 2.4966e+20 |
| 50 | 3.12075e+20 |
| 75 | 4.68113e+20 |
| 100 | 6.24151e+20 |
| 200 | 1.2483e+21 |
| 250 | 1.56038e+21 |
| 500 | 3.12075e+21 |
| 1000 | 6.24151e+21 |
FAQ
How many electronvolts are in one joule?
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.
What is the formula to convert joules to electronvolts?
Multiply the value in joules by 6241509074000000000: electronvolts = joules × 6241509074000000000. For example, 5 J = 3.12075e+19 eV.
How do I convert electronvolts back to joules?
Multiply by the inverse factor 1.602176634e-19 (joules = electronvolts × 1.602176634e-19), or use the electronvolts-to-joules page.
Related conversions
- Electronvolts to joules (reverse)
- Energy Converter — all energy units in one tool
- Kilocalories (food calories) to Kilojoules
- Kilojoules to Kilocalories (food calories)
- Joules to Calories (small, thermochemical)
- Calories (small, thermochemical) to Joules
- Kilowatt-hours to Megajoules
- Megajoules to Kilowatt-hours
- Kilowatt-hours to BTU
- BTU to Kilowatt-hours
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=J&to_unit=eV - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"J","to_unit":"eV"} - Markdown: https://tttkmbb.com/conversion/joules-to-ev.md · JSON: https://tttkmbb.com/conversion/joules-to-ev.json (add
?value=for a result) · Units: /api/v1/units?quantity=energy - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.