Joules to Electronvolts

1 joule = 6.2415091 × 10^18 electronvolts. To convert joules (J) to electronvolts (eV), multiply by 6.2415091 × 10^18.

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How to convert joules to electronvolts

eV = J × 6.2415091 × 10^18

Example: convert 8 joules to electronvolts.
8 J × 6.2415091 × 10^18 = 4.9932073 × 10^19 eV

The same relationship in reverse: 1 electronvolt = 1.6021766 × 10^−19 joules, so you can also divide by 1.6021766 × 10^−19. Need the other direction? Use the electronvolts to joules converter.

You will typically need this conversion for atomic, semiconductor and particle physics.

Joules to Electronvolts conversion chart

Joules (J)Electronvolts (eV)
1 J6.2415091 × 10^18 eV
2 J1.2483018 × 10^19 eV
3 J1.8724527 × 10^19 eV
4 J2.4966036 × 10^19 eV
5 J3.1207545 × 10^19 eV
6 J3.7449054 × 10^19 eV
7 J4.3690564 × 10^19 eV
8 J4.9932073 × 10^19 eV
9 J5.6173582 × 10^19 eV
10 J6.2415091 × 10^19 eV
15 J9.3622636 × 10^19 eV
20 J1.2483018 × 10^20 eV
25 J1.5603773 × 10^20 eV
30 J1.8724527 × 10^20 eV
40 J2.4966036 × 10^20 eV
50 J3.1207545 × 10^20 eV
75 J4.6811318 × 10^20 eV
100 J6.2415091 × 10^20 eV
250 J1.5603773 × 10^21 eV
500 J3.1207545 × 10^21 eV
1,000 J6.2415091 × 10^21 eV

Values rounded to 8 significant figures. The converter above shows up to 12.

About the units

Joule (J)

The SI unit of energy: the work done by a force of one newton over one meter, or one watt for one second.

Electronvolt (eV)

The energy an electron gains across one volt, exactly 1.602176634 × 10⁻¹⁹ J. Used in atomic and particle physics.

Frequently asked questions

How many electronvolts are in a joule?

1 joule = 6.2415091 × 10^18 electronvolts. Going the other way, 1 electronvolt = 1.6021766 × 10^−19 joules.

How do I convert joules to electronvolts?

To convert joules to electronvolts, multiply by 6.2415091 × 10^18. The formula is eV = J × 6.2415091 × 10^18.

What is 8 J in eV?

8 joules is 4.9932073 × 10^19 electronvolts (8 J × 6.2415091 × 10^18 = 4.9932073 × 10^19 eV).

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