Convert Kilojoules to Electronvolts
1 kilojoule (kJ) equals 6.241509074 × 10²¹ electronvolts (eV).
1 kJ = 6.241509074e21 eV
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilojoule to electronvolt converter to paste a column from Excel.
How to Convert Kilojoule to Electronvolt
- 1 kJ = 6.241509074 × 10²¹ eV
- 1 eV = 1.602176634 × 10⁻²² kJ
- Example: convert 15 kJ to eV: 15 kJ = 15 × 6.241509074 × 10²¹ eV = 9.362263612 × 10²² eV
Formula
eV = kJ × 6.241509074461 × 10²¹
Derivation from SI units:
- 1 kJ = 10³ J
- 1 eV = e × 1 V = 1.602176634 × 10⁻¹⁹ J (exact since 2019)
- 1 kJ = 1000 J ÷ 1.602176634 × 10⁻¹⁹ J per eV = 6.241509074461 × 10²¹ eV
Both units are defined exactly, so the factor is exact. Kilojoule definition: kilojoule; Electronvolt definition: electronvolt.
Worked examples
- A reading of 100 kJ converts to 6.241509074 × 10²³ eV.
100 kJ × 6.241509074 × 10²¹ = 6.241509074 × 10²³ eV - A value of 1000 kJ is 6.241509074 × 10²⁴ eV.
1000 kJ × 6.241509074 × 10²¹ = 6.241509074 × 10²⁴ eV
Kilojoule to Electronvolt conversion table
| Kilojoules (kJ) | Electronvolts (eV) |
|---|---|
| 1 kJ | 6.241509074 × 10²¹ eV |
| 4.184 kJ | 2.611447397 × 10²² eV |
| 10 kJ | 6.241509074 × 10²² eV |
| 50 kJ | 3.120754537 × 10²³ eV |
| 100 kJ | 6.241509074 × 10²³ eV |
| 250 kJ | 1.560377269 × 10²⁴ eV |
| 500 kJ | 3.120754537 × 10²⁴ eV |
| 840 kJ | 5.242867623 × 10²⁴ eV |
| 1000 kJ | 6.241509074 × 10²⁴ eV |
| 2000 kJ | 1.248301815 × 10²⁵ eV |
| 8700 kJ | 5.430112895 × 10²⁵ eV |
| 10000 kJ | 6.241509074 × 10²⁵ eV |
Where it's used
Kilojoules are used for nutrition labels (kJ per serving), while electronvolts appear in atomic and particle physics. Both measure energy, work and heat, so the conversion is a fixed factor.
Kilojoule to other energy units
| Conversion | 1 kJ equals |
|---|---|
| kilojoule to joule | 1000 J |
| kilojoule to megajoule | 0.001 MJ |
| kilojoule to calorie | 239.0057361 cal |
| kilojoule to kilocalorie | 0.2390057361 kcal |
| kilojoule to watt-hour | 0.2777777778 Wh |
| kilojoule to kilowatt-hour | 0.0002777777778 kWh |
| kilojoule to BTU | 0.9478171203 BTU |
| kilojoule to therm | 0.00000948043428 thm |
| kilojoule to electronvolt | 6.241509074 × 10²¹ eV |
| kilojoule to foot-pound | 737.5621493 ft·lbf |
| kilojoule to erg | 10000000000 erg |
Frequently asked questions
How many electronvolts are in 1 kilojoule?
1 kJ = 6.241509074 × 10²¹ eV.
How do I convert kilojoules to electronvolts?
Multiply the value in kJ by 6.241509074 × 10²¹. For example, 15 kJ × 6.241509074 × 10²¹ = 9.362263612 × 10²² eV.
Is the kJ to eV conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 and the fixed elementary charge e.
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 Kilojoules to Electronvolts. Retrieved October 17, 2026, from https://scientificconverters.com/energy/kilojoules-to-electronvolts/
IEEE
Scientific Converters, "Convert Kilojoules to Electronvolts," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/kilojoules-to-electronvolts/