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Specific Properties

kcal/kgtoMJ/kg

Convert kilocalories per kilogram (kcal/kg) to megajoules per kilogram (MJ/kg).

Factor1 kcal/kg = 0.004184 MJ/kg

Converter

kcal/kg

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

Result
4.184MJ/kg

Rendered to 6 significant figures.

Formula

Formula
MJ/kg = kcal/kg × 0.004184

Multiply any value in kilocalories per kilogram by 0.004184 to obtain the value in megajoules per kilogram.

Worked example

Convert 1000 kcal/kg to MJ/kg.

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

Conversion table

kcal/kgMJ/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 kcal/kg to MJ/kg?
1 kcal/kg equals 0.004184 MJ/kg. To convert, multiply the value in kilocalories per kilogram by 0.004184.
How do I convert 1 kcal/kg to MJ/kg?
1 kcal/kg = 0.004184 MJ/kg. For any value, multiply by 0.004184.
How do I convert MJ/kg back to kcal/kg?
Divide by the same factor — or equivalently, multiply by 239.0057. So 1 MJ/kg = 239.006 kcal/kg.
When would I need to convert kilocalorie per kilogram to megajoule per kilogram?
Specific-energy conversions between kcal/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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