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Power and Energy

Jtokcal

Convert joules (J) to kilocalories (kcal).

Factor1 J = 0.0002390057 kcal

Converter

J

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

Result
1kcal

Rendered to 6 significant figures.

Formula

Formula
kcal = J × 0.0002390057

Multiply any value in joules by 0.0002390057 to obtain the value in kilocalories.

Worked example

Convert 4184 J to kcal.

  1. 01Start with 4184 J.
  2. 02Multiply by the conversion factor: 4184 × 0.0002390057 = 1 kcal.
Result4184 J = 1 kcal

Conversion table

Jkcal
10.00023901
20.00047801
50.001195
100.0023901
200.0047801
500.01195
1000.023901
2000.047801
5000.1195
10000.23901

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from J to kcal?
1 J equals 0.0002390057 kcal. To convert, multiply the value in joules by 0.0002390057.
How do I convert 1 J to kcal?
1 J = 0.000239006 kcal. For any value, multiply by 0.0002390057.
How do I convert kcal back to J?
Divide by the same factor — or equivalently, multiply by 4184. So 1 kcal = 4184 J.
When would I need to convert joule to kilocalorie?
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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