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Joules to Kilocalories

Convert J to kcal quickly with this free online calculator. The page explains the conversion rule, gives practical examples and provides a quick reference table.

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CONVERTED RESULT—
Decimal places
CONVERSION RULE

1 J equals approximately 0.000239006 kcal.

How to use the Joules to Kilocalories

  1. Enter the number you want to convert.
  2. Confirm the source unit shown beside the input.
  3. Choose decimal precision if you need more or less detail.
  4. Read the converted result.
  5. Copy the result when you need to use it elsewhere.

How the conversion works

1 J equals approximately 0.000239006 kcal.

For a simple fixed-factor conversion, the calculator multiplies the entered value by the stated factor. Temperature scales and certain specialized tools use their specific mathematical relationship instead.

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Common J to kcal conversions

Jkcal
1 J0.000239 kcal
2 J0.000478 kcal
5 J0.001195 kcal
10 J0.00239 kcal
20 J0.00478 kcal
50 J0.01195 kcal

Example

For example, entering 1 J gives approximately 0.000239 kcal using the rule above. Change the input to test your own value.

Frequently asked questions

The Joules to Kilocalories converts a value from J to kcal using the conversion relationship described on this page.
Enter your value, review the source and destination units, choose the decimal precision and read or copy the result.
1 J equals approximately 0.000239006 kcal.
Use enough precision for your purpose. Everyday estimates usually need fewer decimal places; technical work may require more.
It can be a useful reference calculation, but safety-critical, regulated, contractual or specialized work should be verified against the applicable authoritative standard.

Accuracy note: This calculator is a practical reference. For regulated, safety-critical or specialized work, verify the result against the applicable standard.

Page reviewed: August 24, 2026.