Joule to Electron Volt Converter

Energy Converter

27 units available

Decimals:

From

To

6.241509e+18

1 J = 6.241509e+18 eV

Formula:

eV = J × 6.241509e+18

With your value: 1 J = 6.241509e+18 eV

How big is that?

Everyday references on a logarithmic scale, all expressed in joule so you can sanity-check the result.

Heartbeat (1.0× your value)1.00 J

Your value1.00 J

AA battery charge (1.0e+4× your value)1.00e+4 J

Slice of bread (2.8e+5× your value)2.80e+5 J

Daily food intake (8.4e+6× your value)8.40e+6 J

Litre of petrol (3.4e+7× your value)3.42e+7 J

Other Joule to Electron Volt conversions

2 J to eV 3 J to eV 4 J to eV 5 J to eV 6 J to eV 7 J to eV 8 J to eV

Joule to Electron Volt Conversion Table

Joule (J)	Electron Volt (eV)
0.5	3.120755e+18
1	6.241509e+18
2	1.248302e+19
5	3.120755e+19
10	6.241509e+19
15	9.362264e+19
20	1.248302e+20
25	1.560377e+20
50	3.120755e+20
100	6.241509e+20
250	1.560377e+21
500	3.120755e+21
1000	6.241509e+21

Electron Volt to Joule Conversion Table

Electron Volt (eV)	Joule (J)
0.5	8.010883e-20
1	1.602177e-19
2	3.204353e-19
5	8.010883e-19
10	1.602177e-18
15	2.403265e-18
20	3.204353e-18
25	4.005442e-18
50	8.010883e-18
100	1.602177e-17
250	4.005442e-17
500	8.010883e-17
1000	1.602177e-16

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Joule (J)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Electron Volt (eV)

Energy

Exact conversion

1 eV = 1.602 176 634 × 10⁻¹⁹ J exactly, since the elementary charge is now fixed.

Source: CODATA Internationally Recommended Values of the Fundamental Physical Constants (2022 adjustment)

CODATA / NIST · Reviewed 2026-07-01

How to Convert Joule to Electron Volt

To convert from Joule (J) to Electron Volt (eV), multiply the value by 6.241509e+18.

Formula: eV = J × 6.241509e+18

Reverse: J = eV × 1.602177e-19

Step-by-Step Example

Start with your value in Joule. For example: 5 J
Multiply by the conversion factor: 5 x 6.241509e+18
The result is: 3.120755e+19 eV

About Joule

The joule is the SI unit of energy. One joule equals the work done when a force of one newton moves an object one meter.

Common uses: physics, electrical engineering, chemistry.

About Electron Volt

The electron volt (eV) is a unit of energy and work. One electron volt equals 1.602177 × 10^-19 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many Electron Volt are in 1 Joule?

There are exactly 6.241509e+18 Electron Volt in 1 Joule. This means the conversion factor from Joule to Electron Volt is 6.241509e+18.

What is the formula to convert Joule to Electron Volt?

The formula to convert Joule to Electron Volt is: eV = J × 6.241509e+18. For example, to convert 10 Joule to Electron Volt, you would multiply 10 by 6.241509e+18.

What is a Joule?