Volts to eV Calculator

Convert Volts to eV with the formula, a worked example and a table of typical values. Working shown step by step.

Voltage 5 V, charge 1.602176634 × 10⁻¹⁹ C gives

5 eV

Estimate only. Not engineering or safety advice. Check the result against the applicable standard and the equipment data, and have a competent engineer review it before it is relied on. Terms of use.

Open in the calculator with these values

Formula

E = Q × V (1 eV = 1.602176634×10⁻¹⁹ J, the energy of one elementary charge e through 1 V)

Worked example

Input	Value
Voltage	5 V
Charge	1.602176634 × 10⁻¹⁹ C (1 e, one elementary charge)

E = Q × V = 1.602e-19 C × 5 V = 8.011e-19 J
In electronvolts: 5 eV; charge is 1 e

Typical values

Voltage (V)	Energy in electronvolts (eV)
1	1
5	5
12	12
100	100
1,000	1,000

Other inputs are the same as in the worked example above.

Assumptions

Magnitudes only: signs and direction are ignored
Charge moves through the whole potential difference
Elementary charge e = 1.602176634×10⁻¹⁹ C (exact SI value)

For eV to volts, enter the energy in eV and the charge in e (for one electron, 1 e). The volts figure then equals the energy in eV divided by the number of charges. This is the electrostatic relation, not a circuit power calculation.

Frequently asked questions

How do I convert Volts to eV?

E = Q × V (1 eV = 1.602176634×10⁻¹⁹ J, the energy of one elementary charge e through 1 V). Worked example: Voltage 5 V, charge 1.602176634 × 10⁻¹⁹ C gives 5 eV.

What do I need to enter?

Enter energy, voltage and charge. Leave blank the value you want to find, and the form solves for it. Change the unit of a value with its selector and the result stays the same.

What is an electronvolt?

One electronvolt is the energy one electron gains moving through one volt, which is 1.602176634 × 10⁻¹⁹ joules. For a single electron, the energy in eV equals the voltage in volts.

How accurate are the results?

Every figure comes from the same tested engine as the Elecmetric calculators and is meant for estimating. Check design values against the standard and the equipment data you work to.

Next steps in a design: kW to kWh Energy Unit Converter Ohm's Law (V, I, R, P)
Opposite direction: eV to Volts
Also see: Volts to Ohms Ohms to Volts Amps to Volts Volts to Amps
Formula guides: Capacitor Formulas: Energy and RC Time Constant Coulomb’s Law Calculator Energy Converter
All 78 conversions Joules, Volts, Charge and eV (any two) in Elecmetric