keV to eV Converter

One kiloelectronvolt equals 1000 electronvolts (eV). To convert kiloelectronvolts to electronvolts, multiply by 1000; to go back the other way, multiply by 0.001 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 kiloelectronvolts and electronvolts actually measure

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

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.

keV to eV conversion table

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

How to convert kiloelectronvolts to electronvolts by hand

Multiply the number of kiloelectronvolts by 1000.

For example, 25 keV × 1000 = 25000 eV.

Going the other way, divide by 1000 — or multiply by 0.001, 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.