Joules to Electronvolts
Type a value in Joules and get the result in Electronvolts, calculated exactly.
100 Joules ≈ 6.241509074 × 10²⁰ Electronvolts
Precision
Exact factorRounded for display to about 10 significant digits.
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Formula
eV = J × 6.241509074 × 10¹⁸
To convert Joules to Electronvolts, multiply the value by 6.241509074 × 10¹⁸.
Worked examples
- 1 J × 6.241509074 × 10¹⁸ ≈ 6.241509074 × 10¹⁸ eV
- 100 J × 6.241509074 × 10¹⁸ ≈ 6.241509074 × 10²⁰ eV
- 50 J × 6.241509074 × 10¹⁸ ≈ 3.120754537 × 10²⁰ eV
This factor is exact by definition.
Conversion table
| Joules (J) | Electronvolts (eV) |
|---|---|
| 1 | ≈ 6.241509074 × 10¹⁸ |
| 2 | ≈ 1.248301815 × 10¹⁹ |
| 3 | ≈ 1.872452722 × 10¹⁹ |
| 4 | ≈ 2.49660363 × 10¹⁹ |
| 5 | ≈ 3.120754537 × 10¹⁹ |
| 6 | ≈ 3.744905445 × 10¹⁹ |
| 7 | ≈ 4.369056352 × 10¹⁹ |
| 8 | ≈ 4.99320726 × 10¹⁹ |
| 9 | ≈ 5.617358167 × 10¹⁹ |
| 10 | ≈ 6.241509074 × 10¹⁹ |
| 15 | ≈ 9.362263612 × 10¹⁹ |
| 20 | ≈ 1.248301815 × 10²⁰ |
| 25 | ≈ 1.560377269 × 10²⁰ |
| 30 | ≈ 1.872452722 × 10²⁰ |
| 40 | ≈ 2.49660363 × 10²⁰ |
| 50 | ≈ 3.120754537 × 10²⁰ |
| 60 | ≈ 3.744905445 × 10²⁰ |
| 70 | ≈ 4.369056352 × 10²⁰ |
| 75 | ≈ 4.681131806 × 10²⁰ |
| 80 | ≈ 4.99320726 × 10²⁰ |
| 90 | ≈ 5.617358167 × 10²⁰ |
| 100 | ≈ 6.241509074 × 10²⁰ |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Electronvolts to Joules
| Electronvolts (eV) | Joules (J) |
|---|---|
| 1 | 1.602176634 × 10⁻¹⁹ |
| 2 | 3.204353268 × 10⁻¹⁹ |
| 3 | 4.806529902 × 10⁻¹⁹ |
| 4 | 6.408706536 × 10⁻¹⁹ |
| 5 | 8.01088317 × 10⁻¹⁹ |
| 6 | 9.613059804 × 10⁻¹⁹ |
| 7 | ≈ 1.121523644 × 10⁻¹⁸ |
| 8 | ≈ 1.281741307 × 10⁻¹⁸ |
| 9 | ≈ 1.441958971 × 10⁻¹⁸ |
| 10 | 1.602176634 × 10⁻¹⁸ |
| 15 | 2.403264951 × 10⁻¹⁸ |
| 20 | 3.204353268 × 10⁻¹⁸ |
| 25 | 4.005441585 × 10⁻¹⁸ |
| 30 | 4.806529902 × 10⁻¹⁸ |
| 40 | 6.408706536 × 10⁻¹⁸ |
| 50 | 8.01088317 × 10⁻¹⁸ |
| 60 | 9.613059804 × 10⁻¹⁸ |
| 70 | ≈ 1.121523644 × 10⁻¹⁷ |
| 75 | ≈ 1.201632476 × 10⁻¹⁷ |
| 80 | ≈ 1.281741307 × 10⁻¹⁷ |
| 90 | ≈ 1.441958971 × 10⁻¹⁷ |
| 100 | 1.602176634 × 10⁻¹⁷ |
Unit definitions
- Joules J
- The SI unit of energy: one newton acting over one metre, or one watt for one second.
- Electronvolts eV
- The energy one electron gains across one volt: exactly 1.602176634 × 10⁻¹⁹ joules.
Questions people ask
Joules to Electronvolts: what is the conversion factor?
One J is ≈ 6.241509074 × 10¹⁸ eV.
How do I convert Joules to Electronvolts?
Use the formula above. For example, 100 J = ≈ 6.241509074 × 10²⁰ eV.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.