Convert Electronvolts to Kilojoules (eV to kJ)
1 electronvolt (eV) equals 1.602176634 × 10⁻²² kilojoules (kJ).
1 eV = 1.602176634e-22 kJ
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk electronvolt to kilojoule converter to paste a column from Excel.
How to Convert Electronvolt to Kilojoule
- 1 eV = 1.602176634 × 10⁻²² kJ
- 1 kJ = 6.241509074 × 10²¹ eV
- Example: convert 15 eV to kJ: 15 eV = 15 × 1.602176634 × 10⁻²² kJ = 2.403264951 × 10⁻²¹ kJ
Formula
kJ = eV × 1.602176634 × 10⁻²²
or kJ = eV ÷ 6.241509074461 × 10²¹
Derivation from SI units:
- 1 eV = e × 1 V = 1.602176634 × 10⁻¹⁹ J (exact since 2019)
- 1 kJ = 10³ J
- 1 eV = 1.602176634 × 10⁻¹⁹ J ÷ 1000 J per kJ = 1.602176634 × 10⁻²² kJ
Both units are defined exactly, so the factor is exact. Electronvolt definition: electronvolt; Kilojoule definition: kilojoule.
Worked examples
- A reading of 1.5 eV converts to 2.403264951 × 10⁻²² kJ.
1.5 eV × 1.602176634 × 10⁻²² = 2.403264951 × 10⁻²² kJ - A value of 13.6 eV is 2.178960222 × 10⁻²¹ kJ.
13.6 eV × 1.602176634 × 10⁻²² = 2.178960222 × 10⁻²¹ kJ
Electronvolt to Kilojoule conversion table
| Electronvolts (eV) | Kilojoules (kJ) |
|---|---|
| 0.025 eV | 4.005441585 × 10⁻²⁴ kJ |
| 1 eV | 1.602176634 × 10⁻²² kJ |
| 1.12 eV | 1.79443783 × 10⁻²² kJ |
| 1.5 eV | 2.403264951 × 10⁻²² kJ |
| 2 eV | 3.204353268 × 10⁻²² kJ |
| 3 eV | 4.806529902 × 10⁻²² kJ |
| 10 eV | 1.602176634 × 10⁻²¹ kJ |
| 13.6 eV | 2.178960222 × 10⁻²¹ kJ |
| 100 eV | 1.602176634 × 10⁻²⁰ kJ |
| 1000 eV | 1.602176634 × 10⁻¹⁹ kJ |
| 1000000 eV | 1.602176634 × 10⁻¹⁶ kJ |
Where it's used
Electronvolts are used for atomic and particle physics, while kilojoules appear in nutrition labels (kJ per serving). Both measure energy, work and heat, so the conversion is a fixed factor.
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 kilojoules are in 1 electronvolt?
1 eV = 1.602176634 × 10⁻²² kJ.
How do I convert electronvolts to kilojoules?
Multiply the value in eV by 1.602176634 × 10⁻²², or divide it by 6.241509074 × 10²¹. For example, 15 eV × 1.602176634 × 10⁻²² = 2.403264951 × 10⁻²¹ kJ.
Is the eV to kJ conversion exact?
Yes. Both units are defined exactly, and 1 eV is exactly 1.602176634 × 10⁻²² kJ.
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 7, SI prefixes.
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 Kilojoules (eV to kJ). Retrieved October 18, 2026, from https://scientificconverters.com/energy/electronvolts-to-kilojoules/
IEEE
Scientific Converters, "Convert Electronvolts to Kilojoules (eV to kJ)," scientificconverters.com. Accessed: Oct. 18, 2026. [Online]. Available: https://scientificconverters.com/energy/electronvolts-to-kilojoules/