Volt to Electron Volt Calculator

The Volt to Electron Volt Calculator converts electric potential to particle energy using E = q × V, where 1 eV = 1 V × e. Enter voltage in volts, kilovolts, or millivolts, set a charge multiplier for multiple elementary charges, and output energy in eV, keV, MeV, or Joules. Pair it with the Photon Energy Calculator for wavelength-to-eV comparisons.

How to Use

Enter voltage: Input V, kV, or mV.
Set charge multiplier: Use 1 for one electron charge or higher for multiple charges.
Choose output: Select eV, keV, MeV, or Joules.
Calculate: Click Calculate to get energy with steps.
Reset: Clear inputs to run another scenario.

Core Formula

E = q \times V

Energy equals charge in elementary charges times voltage; 1 eV = 1 V × e.

E (eV) = V (volts) × number of charges
Convert to Joules by multiplying eV by 1.602×10⁻¹⁹
Scale to keV or MeV for high-energy applications

Applications

Particle accelerator voltage-to-energy estimates
Detector calibration from potential difference
Semiconductor device bias to energy comparisons
Educational demos on electron volts
Quick Joule equivalents for engineering

Why does 1 V equal 1 eV per electron?

An electron gains 1 eV of energy when accelerated through a 1-volt potential difference.

How do I convert to Joules?

The calculator multiplies eV by 1.602×10⁻19 J/eV when you choose Joule output.

Can I use other charge amounts?

Yes. Set the charge multiplier for multiple elementary charges to scale energy accordingly.

Volt to Electron Volt Calculator