ucUnitCloudInternational unit matrix

Convert

Joule to Kilowatt-hour

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

Unit console

Convert units with formula, context and precision

UnitCloud is a local measurement lab for everyday work, engineering, IT, energy, mobility and design. Every conversion shows result, formula, base unit, rounding and the common mistake.

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

base. Then the value is converted through the base unit J into Kilowatt-hour.

Table

JouleKilowatt-hour
1,0000.00027778
1,000,0000.27777778
3,600,0001

Formula

base. Then the value is converted through the base unit J into Kilowatt-hour.

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 → JEnergyKilocalorie to Kilojoulekcal → kJEnergyKilojoule to KilocaloriekJ → kcalEnergyBritish thermal unit to Kilowatt-hourBTU → kWhEnergy

Search and practice paths

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 current as of May 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?

base. Then the value is converted through the base unit J into Kilowatt-hour.

When should I verify the result?

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