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Use this calculator to

  • Convert particle energies in electron-volts to the equivalent accelerating voltage
  • Check physics homework and exam answers linking energy, charge and potential
  • Relate photon and electron energies to voltages in electronics and spectroscopy

eV to Volts Calculator

Convert energy in electron-volts (eV) to voltage (V).

eV
e (elementary)
Result
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Formulas

  • V = eV / Q (Q in elementary charge units)

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Common scenarios

Select one to run it in the calculator above.

For business

Why this matters for businesses

Electron-volts turn up in the technical spec sheets that engineers and energy managers read when comparing solar PV modules, battery chemistries, or specialist process equipment. A bandgap quoted in eV translates directly to a cell open-circuit voltage and, by extension, to how a module behaves in series strings on a commercial roof. For a procurement lead evaluating a 500 kWp rooftop array, those datasheet numbers are the difference between a system that meets the modelled yield and one that quietly underperforms for 25 years.

Battery chemistry comparisons sit on similar ground. LFP cells typically operate around 3.2 volts nominal, NMC around 3.6 to 3.7, and the difference compounds across a 1 MWh storage system. Cycle life, calendar life, energy density per pound of capex, and round-trip efficiency all flow from the underlying electrochemistry. A behind-the-meter battery procured on headline £/kWh alone, without checking the cell-level voltages and chemistry, can end up sized wrong for the site's actual demand pattern.

Purely Energy supports clients evaluating PV and battery business cases against current and forecast wholesale prices, including how non-commodity costs evolve over the project life and how export tariffs interact with onsite consumption. The engineering inputs are half the work, and the other half is making sure the commercial assumptions hold up under wholesale price scenarios that look nothing like the last five years. A 20-year project costed against a 2024 price curve will land in a very different place once Triad replacements, the shifting balancing services landscape, and the next round of network charging reform are layered in.

Common questions

What is an electron-volt?

An electron-volt (eV) is the energy a single elementary charge gains when it moves through a potential difference of one volt. It equals about 1.602 x 10^-19 joules, which makes it a convenient unit for atomic and particle physics where joules are impractically large. Despite the name, it is a unit of energy, not voltage.

How do I convert eV to volts?

Divide the energy in electron-volts by the charge in elementary charge units: V = eV / Q. For a single electron or proton (Q = 1) the numbers are identical, so 5 eV corresponds to 5 V. For an alpha particle carrying two elementary charges, 10 eV corresponds to only 5 V, because the particle gains twice the energy per volt.

Why does the particle's charge matter in the conversion?

Energy gained in an electric field equals charge times potential difference. A particle with double the charge picks up double the energy crossing the same voltage, so converting back from energy to voltage requires dividing by the charge. That is why the calculator asks for the charge in elementary units alongside the energy in eV.

Is eV anything to do with electric vehicles?

No. The electron-volt is a physics unit of energy used for particles, photons and semiconductor band gaps, while EV in motoring shorthand means electric vehicle. If you are sizing vehicle charging supplies you want power and current conversions instead: the amps to kW and kW to amps calculators on this site cover that ground.

Where are electron-volts used in practice?

They appear throughout electronics and physics: silicon's band gap is about 1.1 eV, visible light photons carry roughly 1.6 to 3.3 eV, and X-ray tubes are described by the kV that sets the photon energy in keV. The unit lets engineers and physicists discuss atomic-scale energies without strings of negative exponents.

Related calculators

The conversions that procurement and engineering use alongside this one.

eV to Volts Calculator | Purely Energy