MeV to GeV Converter

One megaelectronvolt equals 0.001 gigaelectronvolts (GeV). To convert megaelectronvolts to gigaelectronvolts, 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 megaelectronvolts and gigaelectronvolts actually measure

Megaelectronvolt (MeV) — A megaelectron-volt is a million electron-volts. Nuclear physics and radiation therapy.

Gigaelectronvolt (GeV) — A gigaelectron-volt is a billion electron-volts. Particle accelerators and high-energy physics.

MeV to GeV conversion table

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

How to convert megaelectronvolts to gigaelectronvolts by hand

Multiply the number of megaelectronvolts by 0.001.

For example, 25 MeV × 0.001 = 0.025 GeV.

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.