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Joules to Electronvolts Converter

Convert joules to electronvolts and eV to joules instantly. Bidirectional energy converter with formula and common values.

J

Electronvolts

9.9872

eV

1.6e-18 J = 9.9872 eV

eV = J × 6.242e18

Joules to Electronvolts: 1 J equals 6.24200e+18 eV. To convert joules to electronvolts, multiply by 6.24200e+18 (eV = J × 6.242e18). For example, 10 J = 6.24200e+19 eV.

How to Convert Joules to Electronvolts

To convert from joules to electronvolts, multiply the value by 6.24200e+18. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Joules to Electronvolts: eV = J × 6.242e18
  • Electronvolts to Joules: J = eV ÷ 6.242e18

Joules to Electronvolts Conversion Chart

Joules (J)Electronvolts (eV)
0.16.24200e+17
0.251.56050e+18
0.53.12100e+18
16.24200e+18
21.24840e+19
31.87260e+19
53.12100e+19
106.24200e+19
201.24840e+20
251.56050e+20
503.12100e+20
1006.24200e+20
2501.56050e+21
10006.24200e+21

Understanding the Units

What is a Joule?

The joule is the SI derived unit of energy, equal to the work done by a force of one newton acting through a distance of one meter (1 J = 1 N·m = 1 W·s).

Named after James Prescott Joule (1818–1889), the English physicist who demonstrated the mechanical equivalent of heat.

Common contexts: physics, chemistry, engineering.

What is an Electronvolt?

An electronvolt equals approximately 1.602 × 10⁻¹⁹ joules — the kinetic energy gained by a single electron accelerated through a one-volt potential difference.

Common contexts: particle physics, atomic spectroscopy, semiconductor band gaps.

Real-World Reference Points

Item Joules (J) Electronvolts (eV)
Energy to lift an apple 1 m16.242e+18
Heart beat (resting)16.242e+18
AA battery (alkaline)90005.618e+22

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FAQ

How many electronvolts are in one joule?

One joule equals approximately 6.242 × 10^18 electronvolts. The electronvolt is an extremely small energy unit used in atomic and particle physics.

How do I convert joules to electronvolts?

Multiply the joule value by 6.242 × 10^18. For example, 1.602 × 10^-19 J × 6.242 × 10^18 = 1 eV.

What is an electronvolt?

An electronvolt is the energy gained by a single electron moving across a potential difference of one volt. It equals 1.602 × 10^-19 joules.

Where are electronvolts used?

Electronvolts are standard in particle physics, nuclear physics, X-ray spectroscopy, and semiconductor physics. Particle accelerators measure beam energies in MeV, GeV, or TeV.

How many electronvolts are in 1 joul?

1 J equals 6.24200e+18 eV.

How do you convert joules to electronvolts?

Multiply the joul value by 6.24200e+18. Formula: eV = J × 6.242e18.

How many electronvolts are in 5 joules?

5 J = 3.12100e+19 eV.

How do you convert electronvolts back to joules?

Use the inverse formula: J = eV ÷ 6.242e18. For example, 1 eV = 1.60205e-19 J.

What is the difference between Joul and Electronvolt?

The joule is the SI derived unit of energy, equal to the work done by a force of one newton acting through a distance of one meter (1 J = 1 N·m = 1 W·s). An electronvolt equals approximately 1.602 × 10⁻¹⁹ joules — the kinetic energy gained by a single electron accelerated through a one-volt potential difference.