Convert

Joule to Electronvolt

Exact answer: 1 J = 6.241509e18 eV (exact defined constant)

The conversion from Joule to Electronvolt 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?

From1e-18 J

Result6.241509 eV

Factor1 J = 6.241509e18 eV

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

011e-18 J = 6.241509 eV

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 J = 6.241509e18 eV. Joule is the base unit of the family, so the value is converted directly.

Table

Joule to Electronvolt
Joule	Electronvolt
1e-18	6.241509
1e-16	624.150907
1e-15	6,241.509074
1e-14	62,415.090745
1e-13	624,150.907446
1e-12	6,241,509.074461

Formula

1 J = 6.241509e18 eV. Joule is the base unit of the family, so the value is converted directly.

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 Joule to Electronvolt?

1 J = 6.241509e18 eV

Which formula does Joule to Electronvolt use?

1 J = 6.241509e18 eV. Joule is the base unit of the family, so the value is converted directly.

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.