Kilojoule is 1000 joule units.
Kilojoules to Electronvolts Converter — kJ to eV
Convert Kilojoule (kJ) to Electronvolt (eV) using the exact conversion factor (1 kilojoule = 6.241509e+21 electronvolt). See the formula, worked examples, conversion table, and common uses.
Kilojoules to Electronvolts converter
Converter
Energy Converter
Convert joules, calories, kilowatt-hours, BTU, electronvolts, therms, and mechanical work units.
Context values
Some unit families need one extra value for a physically accurate result.
An electronvolt is the energy gained by an electron across one volt.
Result = input x 1000 / 1.60217663e-19.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Kilojoules to Electronvolts
Kilojoule and Electronvolt both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Kilojoule is 1000 joule units, and an electronvolt is the energy gained by an electron across one volt.
Formula
electronvolts = kilojoules × 6.241509e+21
This factor comes from each unit's defined relationship to the category's base unit: 1 kilojoule equals 1000 base units, and 1 electronvolt equals 1.602177e-19 base units, so dividing one by the other gives the direct kilojoule-to-electronvolt factor of 6.241509e+21.
Simple example
1 kJ × 6.241509e+21 = 6.241509e+21 eV
1 kilojoule = 6.241509e+21 electronvolts.
Real-world example
100 kJ × 6.241509e+21 = 6.241509e+23 eV
100 kilojoules = 6.241509e+23 electronvolts.
Conversion table
| Kilojoule (kJ) | Electronvolt (eV) |
|---|---|
| 1 kJ | 6.241509e+21 eV |
| 10 kJ | 6.241509e+22 eV |
| 100 kJ | 6.241509e+23 eV |
| 500 kJ | 3.120755e+24 eV |
| 1,000 kJ | 6.241509e+24 eV |
| 2,000 kJ | 1.248302e+25 eV |
Reverse conversion: Electronvolt to Kilojoule
6.241509e+21 eV × 1.602177e-22 = 0.9999999881 kJ
6.241509e+21 electronvolts = 0.9999999881 kilojoules.
kilojoules = electronvolts × 1.602177e-22
For a page dedicated to this direction, see Electronvolt to Kilojoule.
Understanding the Kilojoule (kJ)
Kilojoule is 1000 joule units.
Understanding the Electronvolt
Electronvolt (eV) measures energy. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. It is classified as a non-SI unit accepted for use with the SI, common in physics.
Where it's used: Standard unit throughout particle physics, atomic physics, and chemistry worldwide
Uses of the Electronvolt today
- Particle physics (particle accelerator energies are often quoted in GeV or TeV)
- Atomic and molecular energy levels
- Semiconductor band-gap energies
Electronvolt — sources
- BIPM SI Brochure, 9th edition — Electronvolt listed as a non-SI unit accepted for use with the SI, with its exact value fixed via the elementary charge.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many electronvolts are in 1 kilojoule?
1 kilojoule equals 6.241509e+21 electronvolts, using the exact defined conversion factor rather than an estimate.
How do I convert kilojoule to electronvolt?
Multiply the kilojoule value by 6.241509e+21. The converter above does this instantly to whatever precision you set.
How do I convert electronvolt back to kilojoule?
Use the reverse factor: 1 electronvolt equals 1.602177e-22 kilojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilojoule?
Kilojoule (kJ) is a unit of energy.
What is a electronvolt?
Electronvolt (eV) measures energy. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. It is classified as a non-SI unit accepted for use with the SI, common in physics.
Is the kilojoule to electronvolt conversion exact?
Yes. The energy gained by a single electron accelerated through an electric potential difference of one volt — a very small amount of energy, exactly 1.602176634 × 10⁻¹⁹ joules. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.