eV to keV Converter

One electronvolt equals 0.001 kiloelectronvolts (keV). To convert electronvolts to kiloelectronvolts, multiply by 0.001; to go back the other way, multiply by 1000 instead.

The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.

What electronvolts and kiloelectronvolts actually measure

Electronvolt (eV) — An electron-volt is the energy one electron gains crossing one volt — 1.602 × 10⁻¹⁹ joules. Atomic and particle physics, and semiconductor band gaps.

Kiloelectronvolt (keV) — A kiloelectron-volt is a thousand electron-volts. X-ray energies and electron microscopy.

eV to keV conversion table

The most common values, worked out in advance. Anything not listed can be typed straight into the converter.

How to convert electronvolts to kiloelectronvolts by hand

Multiply the number of electronvolts by 0.001.

For example, 25 eV × 0.001 = 0.025 keV.

Going the other way, divide by 0.001 — or multiply by 1000, which is the same thing and easier to do in your head.

Everything runs in your browser

There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.