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Specific Properties

kJ/kgtocal/kg

Convert kilojoules per kilogram (kJ/kg) to calories per kilogram (cal/kg).

Factor1 kJ/kg = 239.0057 cal/kg

Converter

kJ/kg

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

Result
239.006cal/kg

Rendered to 6 significant figures.

Formula

Formula
cal/kg = kJ/kg × 239.0057

Multiply any value in kilojoules per kilogram by 239.0057 to obtain the value in calories per kilogram.

Worked example

Convert 1 kJ/kg to cal/kg.

  1. 01Start with 1 kJ/kg.
  2. 02Multiply by the conversion factor: 1 × 239.0057 = 239.006 cal/kg.
Result1 kJ/kg = 239.006 cal/kg

Conversion table

kJ/kgcal/kg
1239.01
2478.01
51195
102390.1
204780.1
5011950
10023901
20047801
5001.1950e+5
10002.3901e+5

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from kJ/kg to cal/kg?
1 kJ/kg equals 239.0057 cal/kg. To convert, multiply the value in kilojoules per kilogram by 239.0057.
How do I convert 1 kJ/kg to cal/kg?
1 kJ/kg = 239.006 cal/kg. For any value, multiply by 239.0057.
How do I convert cal/kg back to kJ/kg?
Divide by the same factor — or equivalently, multiply by 0.004184. So 1 cal/kg = 0.004184 kJ/kg.
When would I need to convert kilojoule per kilogram to calorie per kilogram?
Specific-energy conversions between kJ/kg and cal/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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