Convert

Joule to Kilowatt-hour

Exact answer: 1 J = 2.777778e-7 kWh (defined factor)

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

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What do you want to convert?

From1 J

Result0.00000028 kWh

Factor1 J = 0.0000002778 kWh

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

011,000 J = 0.00027778 kWh

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 = 2.777778e-7 kWh. Joule is the base unit of the family, so the value is converted directly.

Table

Joule	Kilowatt-hour
1,000	0.00027778
1,000,000	0.27777778
3,600,000	1

Formula

1 J = 2.777778e-7 kWh. 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 Kilocalorie to Kilojoulekcal → kJEnergy Kilojoule to KilocaloriekJ → kcalEnergy British thermal unit to Kilowatt-hourBTU → kWhEnergy

Search and practice paths

FormulaTableExamplesCommon mistakeEveryday/engineeringExcel/CSVBatch converterPrint view

kWhEnergy prices, kWh and technical work

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 re-checked as of August 2026. Energy. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.

Common questions

What is the factor for Joule to Kilowatt-hour?

1 J = 0.0000002778 kWh

Which formula does Joule to Kilowatt-hour use?

1 J = 2.777778e-7 kWh. Joule is the base unit of the family, so the value is converted directly.

When should I verify the result?

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