Convert

Kilocalorie to Kilojoule

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

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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.

What do you want to convert?

From1 kcal

Result4.184 kJ

Factor1 kcal = 4.184 kJ

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

011 kcal = 4.184 kJ

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 kcal = 4184 J. Then the value is converted through the base unit J into Kilojoule.

Table

Kilocalorie	Kilojoule
1	4.184
100	418.4
250	1,046
500	2,092
2,000	8,368

Formula

1 kcal = 4184 J. Then the value is converted through the base unit J into Kilojoule.

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 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 current as of May 2026. Energy. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.

Common questions

What is the factor for Kilocalorie to Kilojoule?

1 kcal = 4.184 kJ

Which formula does Kilocalorie to Kilojoule use?

1 kcal = 4184 J. Then the value is converted through the base unit J into Kilojoule.

When should I verify the result?

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