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Joules to Calories

Convert J to cal 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 0.239006 cal.

How to use the Joules to Calories

  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 0.239006 cal.

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 cal conversions

Jcal
1 J0.239006 cal
2 J0.478011 cal
5 J1.195029 cal
10 J2.390057 cal
20 J4.780115 cal
50 J11.950287 cal

Example

For example, entering 1 J gives approximately 0.239006 cal using the rule above. Change the input to test your own value.

Frequently asked questions

The Joules to Calories converts a value from J to cal 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 0.239006 cal.
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.