Convert Electronvolts to Joules
1 electronvolt (eV) equals 1.602176634 × 10⁻¹⁹ joules (J).
1 eV = 1.602176634e-19 J
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk electronvolt to joule converter to paste a column from Excel.
How to Convert Electronvolt to Joule
- 1 eV = 1.602176634 × 10⁻¹⁹ J
- 1 J = 6.241509074 × 10¹⁸ eV
- Example: convert 15 eV to J: 15 eV = 15 × 1.602176634 × 10⁻¹⁹ J = 2.403264951 × 10⁻¹⁸ J
Formula
J = eV × 1.602176634 × 10⁻¹⁹
or J = eV ÷ 6.241509074461 × 10¹⁸
Derivation from SI units:
- 1 eV = e × 1 V = 1.602176634 × 10⁻¹⁹ J (exact since 2019)
- 1 J = 1 N·m = 1 W·s = 1 kg·m²·s⁻²
Both units are defined exactly, so the factor is exact. Electronvolt definition: electronvolt; Joule definition: joule.
Worked examples
- The band gap of silicon, 1.12 eV, is 1.79443783 × 10⁻¹⁹ J.
1.12 eV × 1.602176634 × 10⁻¹⁹ = 1.79443783 × 10⁻¹⁹ J - The hydrogen ionisation energy of 13.6 eV is 2.178960222 × 10⁻¹⁸ J.
13.6 eV × 1.602176634 × 10⁻¹⁹ = 2.178960222 × 10⁻¹⁸ J
Electronvolt to Joule conversion table
| Electronvolts (eV) | Joules (J) |
|---|---|
| 0.025 eV | 4.005441585 × 10⁻²¹ J |
| 1 eV | 1.602176634 × 10⁻¹⁹ J |
| 1.12 eV | 1.79443783 × 10⁻¹⁹ J |
| 1.5 eV | 2.403264951 × 10⁻¹⁹ J |
| 2 eV | 3.204353268 × 10⁻¹⁹ J |
| 3 eV | 4.806529902 × 10⁻¹⁹ J |
| 10 eV | 1.602176634 × 10⁻¹⁸ J |
| 13.6 eV | 2.178960222 × 10⁻¹⁸ J |
| 100 eV | 1.602176634 × 10⁻¹⁷ J |
| 1000 eV | 1.602176634 × 10⁻¹⁶ J |
| 1000000 eV | 1.602176634 × 10⁻¹³ J |
Where it's used
Atomic, semiconductor and particle energies in electronvolts are converted to joules for SI calculations. Since 2019 the factor is exact.
Electronvolt to other energy units
| Conversion | 1 eV equals |
|---|---|
| electronvolt to joule | 1.602176634 × 10⁻¹⁹ J |
| electronvolt to kilojoule | 1.602176634 × 10⁻²² kJ |
| electronvolt to megajoule | 1.602176634 × 10⁻²⁵ MJ |
| electronvolt to calorie | 3.829294058 × 10⁻²⁰ cal |
| electronvolt to kilocalorie | 3.829294058 × 10⁻²³ kcal |
| electronvolt to watt-hour | 4.45049065 × 10⁻²³ Wh |
| electronvolt to kilowatt-hour | 4.45049065 × 10⁻²⁶ kWh |
| electronvolt to BTU | 1.518570443 × 10⁻²² BTU |
| electronvolt to therm | 1.518933028 × 10⁻²⁷ thm |
| electronvolt to foot-pound | 1.181704842 × 10⁻¹⁹ ft·lbf |
| electronvolt to erg | 1.602176634 × 10⁻¹² erg |
Frequently asked questions
How many joules is 1 eV?
Exactly 1.602176634 × 10⁻¹⁹ J.
How many joules are in 1 electronvolt?
1 eV = 1.602176634 × 10⁻¹⁹ J.
How do I convert electronvolts to joules?
Multiply the value in eV by 1.602176634 × 10⁻¹⁹, or divide it by 6.241509074 × 10¹⁸. For example, 15 eV × 1.602176634 × 10⁻¹⁹ = 2.403264951 × 10⁻¹⁸ J.
Is the eV to J conversion exact?
Yes. Both units are defined exactly, and 1 eV is exactly 1.602176634 × 10⁻¹⁹ J.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 and the fixed elementary charge e.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, coherent derived units with special names.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Electronvolts to Joules. Retrieved October 17, 2026, from https://scientificconverters.com/energy/electronvolts-to-joules/
IEEE
Scientific Converters, "Convert Electronvolts to Joules," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/electronvolts-to-joules/