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Specific Properties

cal/kgtokJ/kg

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

Factor1 cal/kg = 0.004184 kJ/kg

Converter

cal/kg

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

Result
4.184kJ/kg

Rendered to 6 significant figures.

Formula

Formula
kJ/kg = cal/kg × 0.004184

Multiply any value in calories per kilogram by 0.004184 to obtain the value in kilojoules per kilogram.

Worked example

Convert 1000 cal/kg to kJ/kg.

  1. 01Start with 1000 cal/kg.
  2. 02Multiply by the conversion factor: 1000 × 0.004184 = 4.184 kJ/kg.
Result1000 cal/kg = 4.184 kJ/kg

Conversion table

cal/kgkJ/kg
10.004184
20.008368
50.02092
100.04184
200.08368
500.2092
1000.4184
2000.8368
5002.092
10004.184

Reference values rounded to 5 significant figures for display.

FAQ

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