What is the exact conversion factor from eV to kJ?

1 electronvolt equals exactly 1.602176634×10⁻²² kilojoules. This is a defined exact value since the 2019 redefinition of SI units fixed the elementary charge at exactly 1.602176634×10⁻¹⁹ coulombs, and 1 eV = 1.602176634×10⁻¹⁹ joules = 1.602176634×10⁻²² kilojoules.

Why is the eV-to-kJ number so small?

An electronvolt is the energy gained by a single electron moving through a 1-volt potential. At the atomic scale this is tiny compared to macroscopic energy units like kilojoules, which are used for molar quantities or mechanical work. One kJ is roughly 6.24×10²¹ eV.

How do I convert eV to kJ/mol for chemistry?

Multiply the eV value by 1.602176634×10⁻²² to get kJ per particle, then multiply by Avogadro's number (6.02214076×10²³) to get kJ/mol. The combined factor is approximately 96.4853 kJ/mol per eV.

Is this converter accurate for scientific use?

Yes. It uses the exact CODATA 2018 / SI-2019 value of 1.602176634×10⁻¹⁹ J per eV, which is now a defined constant with no uncertainty.

Electronvolts to Kilojoules Converter

Name: Electronvolts to Kilojoules Converter
Availability: InStock
Author: Nham Vu

Convert electronvolts (eV) to kilojoules (kJ) instantly. 1 eV = 1.602176634×10⁻²² kJ.

Energy Conversion

Electronvolts (eV)

Kilojoules (kJ)

Enter a value on the left to see the result

Result

Input

Factor 1.602176634 × 10⁻²²

Output

Quick Reference

eV	kJ	Context
1	1.602×10⁻²²	1 eV
1 000	1.602×10⁻¹⁹	1 keV
1 000 000	1.602×10⁻¹⁶	1 MeV
6.242×10²¹	1	1 kJ

Copied!

Summary

Convert electronvolts (eV) to kilojoules (kJ) instantly. 1 eV = 1.602176634×10⁻²² kJ.

How it works

Enter an energy value in electronvolts (eV) in the input field.
The converter multiplies the value by 1.602176634×10⁻²² to get kilojoules.
The result appears instantly with full precision in scientific notation when appropriate.
Use the Swap button to reverse the conversion and convert kJ back to eV.
Copy the result with one click for use in documents or calculations.

Use cases

Convert photon energies from spectroscopy measurements to kilojoules for thermodynamic calculations.
Translate bandgap energies in semiconductor physics from eV to kJ per mole (multiply by Avogadro's number).
Compare ionization energies given in electronvolts against chemical bond energies in kilojoules.
Convert particle accelerator beam energies to SI-adjacent units for engineering reports.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu