eV to Joules Converter
Type a value in electronvolts to see it in joules as you type, with the exact formula and a reference chart.
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How this was calculated
- 1 joule = 6.241509074e+18 electronvolts
- 13.6 ÷ 6.241509074e+18 = 2.1789602e-18 J
| eV | J |
|---|---|
| 1 eV | 1.60218e-19 J |
| 1.12 eV | 1.79444e-19 J |
| 1.5 eV | 2.40326e-19 J |
| 2 eV | 3.20435e-19 J |
| 2.5 eV | 4.00544e-19 J |
| 3 eV | 4.80653e-19 J |
| 5 eV | 8.01088e-19 J |
| 10 eV | 1.60218e-18 J |
| 13.6 eV | 2.17896e-18 J |
| 100 eV | 1.60218e-17 J |
| 1,000 eV | 1.60218e-16 J |
| 1,000,000 eV | 1.60218e-13 J |
| 1,000,000,000 eV | 1.60218e-10 J |
| J | eV |
|---|---|
| 1e-21 J | 0.00624151 eV |
| 1e-20 J | 0.0624151 eV |
| 1e-19 J | 0.624151 eV |
| 1.60218e-19 J | 1 eV |
| 2e-19 J | 1.2483 eV |
| 3e-19 J | 1.87245 eV |
| 5e-19 J | 3.12075 eV |
| 1e-18 J | 6.24151 eV |
| 1e-15 J | 6,241.51 eV |
| 1e-12 J | 6,241,509 eV |
| 1e-9 J | 6,241,509,074 eV |
| 1 J | 6.24151e+18 eV |
How to convert electronvolts to joules
1 electronvolt = 1.602176634e-19 joules. To convert electronvolts to joules, divide by 6.241509074e+18 (or multiply by 1.602176634e-19). An electronvolt is the energy one electron gains across 1 volt, exactly 1.602176634 × 10⁻¹⁹ J. The joule is the SI unit of energy, one newton-meter.
Worked examples
- 1 electronvolt = 1.60218e-19 J (1 ÷ 6.2415091e+18)
- 13.6 electronvolts = 2.17896e-18 J (13.6 ÷ 6.2415091e+18)
- 1,000,000 electronvolts = 1.60218e-13 J (1,000,000 ÷ 6.2415091e+18)
Where this conversion comes up
Electronvolts are used for atomic, particle and semiconductor physics, photon energies and band gaps; joules for physics and electrical energy. Physics problems give photon energies, ionization energies and band gaps in electronvolts but ask for SI joules. Since 2019 the electronvolt is exact: 1 eV = 1.602176634 × 10⁻¹⁹ J, the elementary charge times one volt. The hydrogen ionization energy of 13.6 eV is 2.18 × 10⁻¹⁸ J, and 1 MeV (10⁶ eV) is 1.602 × 10⁻¹³ J.
Quick estimate
Multiply by 1.6 × 10⁻¹⁹ (0.14% low): 5 eV ≈ 8 × 10⁻¹⁹ J.
Common mistakes
- Multiplying instead of dividing. A joule is larger than a electronvolt, so the number of joules must come out smaller: 1 electronvolt = 1.60218e-19 J.
Going the other way? Use the joules to ev converter. Related energy converters: kj to calories, kcal to kj, kj to kcal, kwh to mwh, kj to j, j to kj.
Frequently asked questions
How do you convert electronvolts to joules?
Multiply the electronvolts by 1.602176634e-19 (or divide by 6.241509074e+18). For example, 13.6 electronvolts is 2.17896e-18 joules.
How many joules are in one electronvolt?
One electronvolt is 1.602176634e-19 joules. An electronvolt is the energy one electron gains across 1 volt, exactly 1.602176634 × 10⁻¹⁹ J.
What is 1,000,000 electronvolts in joules?
1,000,000 electronvolts is 1.60218e-13 joules.
Is there a quick way to estimate electronvolts to joules?
Multiply by 1.6 × 10⁻¹⁹ (0.14% low): 5 eV ≈ 8 × 10⁻¹⁹ J.