Volt to Electron Volt Calculator

An electron volt (eV) measures the energy gained by a charged particle — like an electron — when it moves through an electric potential difference of one volt, making it a fundamental unit in atomic and particle physics. Enter your Voltage (in volts) and Electric Charge — using either elementary charges or coulombs — into the Volt to Electron Volt Calculator to get the Energy in Electron Volts (eV). Secondary outputs include the equivalent energy in joules and the charge value used in the calculation.

V

The electrical potential difference in volts

Select whether to enter charge in elementary charges or coulombs

e

Number of elementary charges (e.g. 1 = charge of one electron/proton)

C

Electric charge in coulombs (C)

Results

Energy in Electron Volts

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Energy in Joules

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Charge Used

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Frequently Asked Questions

What is an electron volt (eV)?

An electron volt is a unit of energy equal to the amount of kinetic energy gained by a single electron when it is accelerated through an electric potential difference of one volt. It equals 1.602176634 × 10⁻¹⁹ joules. It is widely used in atomic, nuclear, and particle physics.

How do I convert volts to electron volts?

To convert volts to electron volts using elementary charge, multiply the voltage (V) by the number of elementary charges (e): E(eV) = V × Q(e). If using coulombs, the formula is E(eV) = V × Q(C) / 1.602176634 × 10⁻¹⁹. This calculator handles both methods automatically.

What is the difference between a volt and an electron volt?

A volt (V) is the SI unit of electric potential difference or electromotive force. An electron volt (eV) is a unit of energy. The two measure different physical quantities — voltage measures electrical potential, while the electron volt measures the energy gained by a charged particle moving through that potential.

What is the formula for electron volt to joule conversion?

One electron volt equals exactly 1.602176634 × 10⁻¹⁹ joules. So to convert eV to joules, multiply the energy in eV by 1.602176634 × 10⁻¹⁹. Conversely, divide joules by 1.602176634 × 10⁻¹⁹ to get electron volts.

What is elementary charge?

Elementary charge (symbol: e) is the electric charge carried by a single proton or the magnitude of charge carried by a single electron. Its value is 1.602176634 × 10⁻¹⁹ coulombs. When you enter charge in elementary units, the calculator uses this constant to convert internally.

When should I use coulombs instead of elementary charge?

Use elementary charge (e) when dealing with a known number of electrons or protons — for example, 1e means a single electron's charge. Use coulombs (C) when you have a measured or calculated charge value in the SI unit system, which is more common in macroscopic electrical engineering contexts.

Where are electron volts commonly used?

Electron volts are the standard energy unit in particle physics, nuclear physics, and quantum mechanics. They are used to describe the energy of photons, the binding energy of atoms, the kinetic energy of particles in accelerators, and the band gap energy in semiconductors.

Can this calculator handle very small or very large charge values?

Yes. For coulombs input, you can enter scientific notation values (e.g. 1.6e-19 for one elementary charge). The calculator correctly handles the full range from subatomic particle energies to larger charge quantities.