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Specific Properties

kcal/kgtokJ/kg

Convert kilocalories per kilogram (kcal/kg) to kilojoules per kilogram (kJ/kg).

Factor1 kcal/kg = 4.184 kJ/kg

Converter

kcal/kg

Accepts numbers or expressions, e.g. 150 + 14.7

Result
4.184kJ/kg

Rendered to 6 significant figures.

Formula

Formula
kJ/kg = kcal/kg × 4.184

Multiply any value in kilocalories per kilogram by 4.184 to obtain the value in kilojoules per kilogram.

Worked example

Convert 1 kcal/kg to kJ/kg.

  1. 01Start with 1 kcal/kg.
  2. 02Multiply by the conversion factor: 1 × 4.184 = 4.184 kJ/kg.
Result1 kcal/kg = 4.184 kJ/kg

Conversion table

kcal/kgkJ/kg
14.184
28.368
520.92
1041.84
2083.68
50209.2
100418.4
200836.8
5002092
10004184

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from kcal/kg to kJ/kg?
1 kcal/kg equals 4.184 kJ/kg. To convert, multiply the value in kilocalories per kilogram by 4.184.
How do I convert 1 kcal/kg to kJ/kg?
1 kcal/kg = 4.184 kJ/kg. For any value, multiply by 4.184.
How do I convert kJ/kg back to kcal/kg?
Divide by the same factor — or equivalently, multiply by 0.2390057. So 1 kJ/kg = 0.239006 kcal/kg.
When would I need to convert kilocalorie per kilogram to kilojoule per kilogram?
Specific-energy conversions between kcal/kg and kJ/kg are needed in fuel-property datasheets (HHV/LHV), thermodynamic state calculations, battery energy-density comparisons, and combustion analysis. kJ/kg is the SI standard; BTU/lb is common in US fuel specifications.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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