Convert Electron Volts to Joules Online — Free eV to J Energy Converter

Convert eV to J as you type.

Energy Unit Converter - Instant & Accurate

1 eV ≈ 1.602177e-19 J

Reference for one unit; displayed values may be rounded.

Enter Electron Volts

Electron Volts

Use a dot or comma for decimals, without thousands separators.

Result in Joules

Joules

Decimal places

Display rounding does not improve the accuracy of your original measurement. Very large or very small results use scientific notation.

Method and source

eV to J Conversion Formula

To convert electron volts to joules, multiply the eV value by 1.60218e-19. One electron volt is the energy a single electron gains crossing a one-volt potential, and its joule equivalent sits at the atomic scale — 1 eV = 1.60218e-19 J. It is the constant every physics student from Perth to Sydney keeps handy.

1 eV ≈ 1.602177e-19 J

Electron Volts and Joules Explained

Electron Volts (eV)

The electron volt (eV) is the kinetic energy a single electron gains when accelerated through an electric potential of one volt, equal to 1.60218e-19 joules. It is the working unit of atomic physics because natural energies there are small integers: chemical bonds run 1-10 eV, visible photons 1.6-3.3 eV, and diagnostic X-rays tens of keV. Its multiples scale smoothly up to the TeV beam energies of the Large Hadron Collider.

Where it is used: Standard in atomic and particle physics, photon and spectroscopy tables, semiconductor band-gap data, X-ray and radiation dosimetry contexts, and accelerator engineering — including work at facilities like the Australian Synchrotron.

Origin: Introduced in the early 20th century as vacuum-tube experiments made electron energies directly measurable by applied voltage; the name stuck because voltage was the observable.

Joules (J)

The joule (J) is the SI unit of energy — one newton metre, or one watt-second — and the unit every physical equation expects after dimensional analysis. A single joule is enormous on the atomic scale: it equals about 6.2415e18 eV, or the energy of more than three quintillion red photons. Physicists convert eV to J (factor 1.60218e-19) whenever microscopic quantities must enter macroscopic formulas involving mass, velocity, power, or temperature.

Where it is used: Mandatory in SI-based publication, engineering computation, and any calculation mixing atomic quantities with everyday units like watts or kilograms.

Origin: Named for James Prescott Joule, who established the equivalence of heat and mechanical work in the 1840s; the joule anchors the modern SI energy framework.

Electron Volts to Joules Conversion Table

Select a value to use it in the calculator.

Electron Volts (eV)	Joules (J)
	1.602177e-19 J
	3.204353e-19 J
	8.010883e-19 J
	1.602177e-18 J
	4.005442e-18 J
	8.010883e-18 J
	1.602177e-17 J
	1.602177e-16 J
	1.602177e-15 J
	1.602177e-14 J
	1.602177e-13 J
	1.602177e-10 J
	1.602177e-7 J

Joules to Electron Volts Conversion Table

Joules (J)	Electron Volts (eV)
1.000000e-19 J	0.6241509074 eV
1.602180e-19 J	1.0000021009 eV
1.000000e-18 J	6.2415090745 eV
1.000000e-17 J	62.4150907446 eV
1.000000e-15 J	6241.5090744608 eV
1.000000e-12 J	6.241509e+6 eV
1.000000e-9 J	6.241509e+9 eV
1.000000e-6 J	6.241509e+12 eV
0.001 J	6.241509e+15 eV
1 J	6.241509e+18 eV

Electron Volts to Joules in Everyday Objects

Common real-world examples that make Electron Volts and Joules easy to picture at a glance.

	Electron Volts (eV)	Joules (J)
A thermal-energy electron at room temperature	0.025 eV	4.005442e-21 J
A red photon (650 nm)	1.9 eV	3.044136e-19 J
A blue photon (450 nm)	2.75 eV	4.405986e-19 J
Breaking a molecular bond	4 eV	6.408707e-19 J
A dental X-ray photon	60000 eV	9.613060e-15 J
A proton in the LHC	6.500000e+12 eV	1.041415e-6 J

When You Need Electron Volts to Joules Conversions

Semiconductor Band-Gap Calculations

LED and solar-panel datasheets quote band gaps in eV — silicon at 1.12 eV, GaN at 3.4 eV. Converting to 1.79444e-19 J and 5.44741e-19 J lets engineers — from rooftop-solar designers in Brisbane to PV researchers in Melbourne and Adelaide — compute junction power densities in pure SI units.

Photon Energy in Spectroscopy

Spectra are labelled in eV while detector energy budgets are in joules — a mix you soon meet at facilities like the Australian Synchrotron. A 2.33 eV green laser line becomes 3.73e-19 J per photon — multiply by photon flux and optical power falls out in watts.

Radiation and Dosimetry Coursework

Nuclear and medical-physics courses quote gamma energies in MeV, but absorbed-dose formulas need joules per kilogram. A 0.662 MeV caesium-137 photon converts to 1.06064e-13 J before entering dose equations — a routine step in coursework tied to ANSTO's OPAL reactor near Sydney.

Particle Accelerator Problem Sets

Accelerator physics mixes beam energies in TeV with SI kinematics. An LHC proton at 6.5 TeV (6.5e12 eV) carries 1.04142e-6 J — small enough per particle that a morning flat white still holds vastly more energy than any single proton.

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How to Use

1

Enter Electron Volts

Type the eV value from your physics assignment — typical entries are single-digit eV for photons and chemical bonds, or scientific notation like 6.5e12 eV for particles in an accelerator such as the Australian Synchrotron in Melbourne
2

View Joules

The SI equivalent appears instantly: a 2 eV visible photon converts to 3.20436e-19 J, ready for any equation demanding proper SI units — from first-year physics at UNSW to materials research at Monash
3

Copy or Swap

Copy the result or click Swap to convert joules back to electron volts (1 J = 6.2415e18 eV) for reverse checks
4

Keep the Scale in Mind

One joule equals about 6.2415e18 eV, so everyday energies hold astronomical electron-volt counts — a cricket ball bowled at 150 km/h carries roughly 140 J, which is about 8.7e20 eV. If your result is not vanishingly small, an exponent has slipped somewhere

Why Use Be Converter?

Instant Conversion

Get precise eV to joule results in real time as you type — perfect for uni problem sets and prac reports

Scientific Notation Handled Cleanly

Enter values like 2.5 eV or 6.5e12 eV and get exact results using 1 eV = 1.60218e-19 J — no fiddly exponent arithmetic required

Conversion Table

Quick reference across physics scales — 1.9 eV red photon (3.04e-19 J), 5,000 eV X-ray photon like those produced at the Australian Synchrotron (8.01e-16 J), and 6.5e12 eV LHC proton (1.04e-6 J)

Bidirectional

Easily swap between electron volts and joules with one click to check both directions of a calculation

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Frequently Asked Questions

How many joules are in 1 electron volt?

1 electron volt equals 1.60218e-19 joules — 0.000000000000000000160218 J. It is the kinetic energy one electron gains accelerating through a potential difference of one volt. Keep this constant handy; it turns up in every energy unit conversion from first-year physics onward.

How do I convert 10 eV to joules?

Multiply by 1.60218e-19: 10 eV = 1.60218e-18 J. That is deep-ultraviolet territory — well beyond the UVB that makes an Aussie summer sun so harsh — which is why photochemistry and vacuum-UV tables live in this range.

How many electron volts are in 1 joule?

One joule equals about 6.2415e18 eV — six quintillion electron volts. That huge ratio is why eV rules the atomic scale: a single visible photon is about 2 eV, but in joules it is an unwieldy 3.2e-19 J.

Why do physicists use eV instead of joules?

Atomic energies are awkward in SI units — a chemical bond of 4 eV is 6.4e-19 J. Electron volts keep numbers human-sized and connect directly to measurable voltages: an electron accelerated through 5 V carries exactly 5 eV. You only need the 1.60218e-19 factor when formal SI units are demanded, such as in a lab report or exam answer.

What is the energy of a visible photon in joules?

Visible photons span roughly 1.6 to 3.3 eV. Converting: a 1.9 eV deep-red photon — the colour of an Outback sunset — is 3.04e-19 J, and a 2.75 eV blue photon is 4.41e-19 J. Green laser pointers at 532 nm emit 2.33 eV photons, or 3.73e-19 J each.

How many joules is 1 MeV?

1 MeV = 1,000,000 eV = 1.60218e-13 J. Nuclear decay energies are quoted this way: a caesium-137 gamma ray at 0.662 MeV carries 1.06064e-13 J per photon — a figure you will meet in radiation physics and medical-imaging courses around Australia.

Is an electron volt energy or voltage?

It is energy. The name comes from how it is defined — charge (e) times voltage (V) — so one electron crossing a 1 V gap gains 1 eV. Voltage itself is measured in volts, while eV always represents an amount of energy equal to 1.60218e-19 J.

How does temperature relate to electron volts?

Even on a 40°C summer afternoon in the Outback, the thermal energy kT is only about 0.027 eV (4.3e-21 J); at room temperature (300 K) it is a near 0.025 eV via the Boltzmann relation. This is why semiconductor band gaps of 1-3 eV cannot be crossed by heat alone — and why rooftop solar on Aussie homes needs photons, not warmth, to generate power: silicon's 1.12 eV band gap demands light of the right energy.

About Our Electron Volts to Joules Converter

Our free online electron volts to joules converter delivers instant, accurate energy conversions for physics, chemistry, and materials science across Australia. The electron volt is the natural energy unit of the microscopic world: photon energies, chemical bond strengths, semiconductor band gaps, X-ray emissions, and particle accelerators are all measured in eV or its multiples (keV, MeV, GeV, TeV). The SI joule remains the required unit for formal equations and dimensional analysis. Using the conversion 1 eV = 1.60218e-19 J, this tool bridges the two systems instantly — whether you are crunching problem sets at uni, analysing beamline data from the Australian Synchrotron in Melbourne, or modelling solar cells for harsh Outback sun, enter any value in electron volts and receive the joule equivalent in clean scientific notation.

Expert Tips for Converting eV to Joules

The factor is 1.60218e-19 J per eV. In reverse, 1 J = 6.2415e18 eV. Memorise the exponent pair (-19 / +18) and you can sanity-check any conversion by magnitude alone.

Prefix shortcuts: 1 keV = 1.60218e-16 J, 1 MeV = 1.60218e-13 J, 1 GeV = 1.60218e-10 J, 1 TeV = 1.60218e-7 J. The LHC runs protons at 6.5 TeV, giving 1.04e-6 J each, while closer to home the Australian Synchrotron in Melbourne circulates electrons at 3 GeV — about 4.8e-10 J apiece.

Photon work: E = hc/λ gives energy in eV when λ is in nanometres — just divide 1240 by λ. A 620 nm red photon is 2.0 eV; converting to joules (×1.60218e-19) yields 3.2e-19 J.

Semiconductor band gaps: silicon at 1.12 eV is 1.79444e-19 J and GaN at 3.4 eV is 5.44741e-19 J. With rooftop solar on millions of Aussie homes, converting band gaps to joules is essential when computing power densities from photon flux.

Chemistry crossover: bond energies often appear in kJ/mol. Since 1 eV per particle equals 96.48 kJ/mol, a 4 eV bond is about 385.9 kJ/mol — convert to joules per particle (6.40872e-19 J) first for consistency.

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