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Energy

Convert electronvolts to kilojoules

1 eV=1.6022e-22kJ

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

1.6022e-22

Conversion formula

Forward
kilojoules = electronvolts × 1.6022e-22
Reverse
electronvolts = kilojoules × 6.2415e21

Example: 10 eV × 1.6022e-22 = 1.6022e-21 kJ.

About both units

From

Electronvolt

eV

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 →
To

Kilojoule

kJ

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 to Kilojoule conversion table

Common electronvolts to kilojoules values for quick reference.

Electronvolt (eV)Kilojoule (kJ)
1 eV1.6022e-22 kJ
10 eV1.6022e-21 kJ
100 eV1.6022e-20 kJ
500 eV8.0109e-20 kJ
1,000 eV1.6022e-19 kJ
5,000 eV8.0109e-19 kJ
10,000 eV1.6022e-18 kJ
50,000 eV8.0109e-18 kJ
100,000 eV1.6022e-17 kJ
500,000 eV8.0109e-17 kJ

Tips & common mistakes

Quick tips

  • 1 eV ≈ 1.602 × 10⁻¹⁹ J.
  • Particle physics scales: eV → keV → MeV → GeV → TeV (1000× each).
  • Photon energy (eV) × wavelength (nm) ≈ 1240.

Avoid these

  • Confusing eV with V (volt) — eV is energy, V is electric potential.
  • Mixing scales: treating MeV as twice eV — it's a million times larger.
  • Using eV for macroscopic energy — unwieldy numbers.

Frequently asked questions

How many kilojoules in a electronvolt?
One electronvolt equals 1.6022e-22 kilojoules.
How do I convert electronvolts to kilojoules?
Multiply the electronvolt value by 1.6022e-22 to get the equivalent in kilojoules.
What is 100 electronvolts in kilojoules?
100 electronvolts equals 1.6022e-20 kilojoules.
Is a electronvolt bigger than a kilojoule?
No. 1 electronvolt equals 1.6022e-22 kilojoules, so one electronvolt is smaller.
How to convert electronvolts to kilojoules without a calculator?
Multiply by 0 for a quick estimate; use a calculator for precise results.

Related energy conversions

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eV → J
1 = 1.6022e-19 J
eV → MJ
1 = 1.6022e-25 MJ
eV → kWh
1 = 4.4505e-26 kWh
eV → Wh
1 = 4.4505e-23 Wh
eV → cal
1 = 3.8293e-20 cal
eV → kcal
1 = 3.8293e-23 kcal
eV → BTU
1 = 1.5186e-22 BTU
eV → thm
1 = 1.5186e-27 thm

More to Kilojoule

J → kJ
1 = 0.001 kJ
MJ → kJ
1 = 1,000 kJ
kWh → kJ
1 = 3,600 kJ
Wh → kJ
1 = 3.6 kJ
cal → kJ
1 = 0.004184 kJ
kcal → kJ
1 = 4.184 kJ
BTU → kJ
1 = 1.05506 kJ
thm → kJ
1 = 105,505.59 kJ

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