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Power and Energy

kcaltoMJ

Convert kilocalories (kcal) to megajoules (MJ).

Factor1 kcal = 0.004184 MJ

Converter

kcal

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

Result
4.184MJ

Rendered to 6 significant figures.

Formula

Formula
MJ = kcal × 0.004184

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

Worked example

Convert 1000 kcal to MJ.

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

Conversion table

kcalMJ
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 to MJ?
1 kcal equals 0.004184 MJ. To convert, multiply the value in kilocalories by 0.004184.
How do I convert 1 kcal to MJ?
1 kcal = 0.004184 MJ. For any value, multiply by 0.004184.
How do I convert MJ back to kcal?
Divide by the same factor — or equivalently, multiply by 239.0057. So 1 MJ = 239.006 kcal.
When would I need to convert kilocalorie to megajoule?
Energy conversions are needed when reconciling fuel/electrical billing, calculating thermal duties, and aligning calorimetry or HHV/LHV figures across data sources.
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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