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Specific Properties

cal/kgtoMJ/kg

Convert calories per kilogram (cal/kg) to megajoules per kilogram (MJ/kg).

Factor1 cal/kg = 4.184e-6 MJ/kg

Converter

cal/kg

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

Result
4.184MJ/kg

Rendered to 6 significant figures.

Formula

Formula
MJ/kg = cal/kg × 4.184e-6

Multiply any value in calories per kilogram by 4.184e-6 to obtain the value in megajoules per kilogram.

Worked example

Convert 1.00000e+6 cal/kg to MJ/kg.

  1. 01Start with 1.00000e+6 cal/kg.
  2. 02Multiply by the conversion factor: 1.00000e+6 × 4.184e-6 = 4.184 MJ/kg.
Result1.00000e+6 cal/kg = 4.184 MJ/kg

Conversion table

cal/kgMJ/kg
14.184e-6
28.368e-6
52.092e-5
104.184e-5
208.368e-5
500.0002092
1000.0004184
2000.0008368
5000.002092
10000.004184

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from cal/kg to MJ/kg?
1 cal/kg equals 4.184e-6 MJ/kg. To convert, multiply the value in calories per kilogram by 4.184e-6.
How do I convert 1 cal/kg to MJ/kg?
1 cal/kg = 4.184e-6 MJ/kg. For any value, multiply by 4.184e-6.
How do I convert MJ/kg back to cal/kg?
Divide by the same factor — or equivalently, multiply by 239005.7. So 1 MJ/kg = 239006 cal/kg.
When would I need to convert calorie per kilogram to megajoule per kilogram?
Specific-energy conversions between cal/kg and MJ/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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