Convert

Electronvolt to Joule

Exact answer: 1 eV = 1.602177e-19 J (exact defined constant)

The conversion from Electronvolt to Joule rests on an exactly defined constant rather than on a measurement. Energy appears in electricity tariffs, food labels, heating costs and technical datasheets.

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What do you want to convert?

From1 eV

Result1.602177e-19 J

Factor1 eV = 1.602177e-19 J

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

011 eV = 1.602177e-19 J

Example value from the reference table. Internal calculation uses stored factors; display output is rounded.

02Common mistake

Food calories are kilocalories. Utility bills use kilowatt-hours. Both are energy units, but in different contexts.

03Base unit: J

1 eV = 1.602176634e-19 J. Then the value is converted through the base unit J into Joule.

Table

Electronvolt to Joule
Electronvolt	Joule
1	1.602177e-19
10	1.602177e-18
100	1.602177e-17
1,000	1.602177e-16
1,000,000	1.602177e-13
1,000,000,000	1.602177e-10

Formula

1 eV = 1.602176634e-19 J. Then the value is converted through the base unit J into Joule.

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.

Related conversions

Kilowatt-hour to JoulekWh → JEnergy Joule to Kilowatt-hourJ → kWhEnergy Joule to KilojouleJ → kJEnergy Kilojoule to JoulekJ → JEnergy

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Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Energy. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.

Common questions

What is the factor for Electronvolt to Joule?

1 eV = 1.602177e-19 J

Which formula does Electronvolt to Joule use?

1 eV = 1.602177e-19 J. Then the value is converted through the base unit J into Joule.

What is the most common mistake?

Food calories are kilocalories. Utility bills use kilowatt-hours. Both are energy units, but in different contexts.

When should I verify the result?

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.