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Specific Properties

J/kgtocal/kg

Convert joules per kilogram (J/kg) to calories per kilogram (cal/kg).

Factor1 J/kg = 0.2390057 cal/kg

Converter

J/kg

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

Result
1000cal/kg

Rendered to 6 significant figures.

Formula

Formula
cal/kg = J/kg × 0.2390057

Multiply any value in joules per kilogram by 0.2390057 to obtain the value in calories per kilogram.

Worked example

Convert 4184 J/kg to cal/kg.

  1. 01Start with 4184 J/kg.
  2. 02Multiply by the conversion factor: 4184 × 0.2390057 = 1000 cal/kg.
Result4184 J/kg = 1000 cal/kg

Conversion table

J/kgcal/kg
10.23901
20.47801
51.195
102.3901
204.7801
5011.95
10023.901
20047.801
500119.5
1000239.01

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from J/kg to cal/kg?
1 J/kg equals 0.2390057 cal/kg. To convert, multiply the value in joules per kilogram by 0.2390057.
How do I convert 1 J/kg to cal/kg?
1 J/kg = 0.239006 cal/kg. For any value, multiply by 0.2390057.
How do I convert cal/kg back to J/kg?
Divide by the same factor — or equivalently, multiply by 4.184. So 1 cal/kg = 4.184 J/kg.
When would I need to convert joule per kilogram to calorie per kilogram?
Specific-energy conversions between J/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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