Electronvolts to Joules

1 electronvolt = 1.6021766 × 10^−19 joules. To convert electronvolts (eV) to joules (J), multiply by 1.6021766 × 10^−19.

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How to convert electronvolts to joules

J = eV × 1.6021766 × 10^−19

Example: convert 8 electronvolts to joules.
8 eV × 1.6021766 × 10^−19 = 1.2817413 × 10^−18 J

The same relationship in reverse: 1 joule = 6.2415091 × 10^18 electronvolts, so you can also divide by 6.2415091 × 10^18. Need the other direction? Use the joules to electronvolts converter.

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

Electronvolts to Joules conversion chart

Electronvolts (eV)Joules (J)
1 eV1.6021766 × 10^−19 J
2 eV3.2043533 × 10^−19 J
3 eV4.8065299 × 10^−19 J
4 eV6.4087065 × 10^−19 J
5 eV8.0108832 × 10^−19 J
6 eV9.6130598 × 10^−19 J
7 eV1.1215236 × 10^−18 J
8 eV1.2817413 × 10^−18 J
9 eV1.441959 × 10^−18 J
10 eV1.6021766 × 10^−18 J
15 eV2.403265 × 10^−18 J
20 eV3.2043533 × 10^−18 J
25 eV4.0054416 × 10^−18 J
30 eV4.8065299 × 10^−18 J
40 eV6.4087065 × 10^−18 J
50 eV8.0108832 × 10^−18 J
75 eV1.2016325 × 10^−17 J
100 eV1.6021766 × 10^−17 J
250 eV4.0054416 × 10^−17 J
500 eV8.0108832 × 10^−17 J
1,000 eV1.6021766 × 10^−16 J

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

About the units

Electronvolt (eV)

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

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.

Frequently asked questions

How many joules are in a electronvolt?

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

How do I convert electronvolts to joules?

To convert electronvolts to joules, multiply by 1.6021766 × 10^−19. The formula is J = eV × 1.6021766 × 10^−19.

What is 8 eV in J?

8 electronvolts is 1.2817413 × 10^−18 joules (8 eV × 1.6021766 × 10^−19 = 1.2817413 × 10^−18 J).

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