Convert kilojoules to electronvolts

1 kJ=6.2415e21eV

Use the converter below to change any kilojoules value into electronvolts instantly — with formula, conversion table, and real-world examples.

You have

Equals

6.2415e21

Conversion formula

Forward

electronvolts = kilojoules × 6.2415e21

Reverse

kilojoules = electronvolts × 1.6022e-22

Example: 10 kJ × 6.2415e21 = 6.2415e22 eV.

About both units

From

Kilojoule

The kilojoule equals 1000 joules. Used on European nutrition labels (required by EU law alongside kcal), for mechanical work specifications, and some engineering contexts. A 100 g chocolate bar contains about 2100 kJ.

Real-world: 100 g chocolate: ~2100 kJ. EU daily intake (adult): ~8400 kJ. Tesla Model 3 battery: ~270 MJ = 270,000 kJ.

Read full kilojoule reference →

Electronvolt

The electronvolt equals 1.602 × 10⁻¹⁹ joules — the energy gained by an electron accelerated through 1 volt. It is the natural energy unit of atomic, nuclear and particle physics. Chemical bonds are a few eV; LHC protons reach 7 TeV = 7 × 10¹² eV.

Real-world: Silicon band gap: 1.12 eV. Hydrogen ionization: 13.6 eV. LHC proton: 7 TeV. Photon wavelength 500 nm = 2.5 eV.

Read full electronvolt reference →

Kilojoule to Electronvolt conversion table

Common kilojoules to electronvolts values for quick reference.

Kilojoule (kJ)	Electronvolt (eV)
1 kJ	6.2415e21 eV
10 kJ	6.2415e22 eV
100 kJ	6.2415e23 eV
500 kJ	3.1208e24 eV
1,000 kJ	6.2415e24 eV
5,000 kJ	3.1208e25 eV
10,000 kJ	6.2415e25 eV
50,000 kJ	3.1208e26 eV
100,000 kJ	6.2415e26 eV
500,000 kJ	3.1208e27 eV

Tips & common mistakes

Quick tips

1 kJ = 1000 J = 0.239 kcal.
EU nutrition labels must show both kJ and kcal.
For quick conversion: kcal × 4.2 = kJ.

Avoid these

Assuming European labels use kcal only — they use both kJ and kcal.
Confusing kJ with kW (power).
Using kcal when kJ is requested in scientific context.

Frequently asked questions

How many electronvolts in a kilojoule?

One kilojoule equals 6.2415e21 electronvolts.

How do I convert kilojoules to electronvolts?

Multiply the kilojoule value by 6.2415e21 to get the equivalent in electronvolts.

What is 100 kilojoules in electronvolts?

100 kilojoules equals 6.2415e23 electronvolts.

Is a kilojoule bigger than a electronvolt?

Yes. 1 kilojoule equals 6.2415e21 electronvolts, so one kilojoule is larger.

How to convert kilojoules to electronvolts without a calculator?

Multiply by 6.2415e21 for a quick estimate; use a calculator for precise results.

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