To convert joules to calories, multiply by 0.2390057361.
The calculation uses 1 J = 0.2390057361 cal. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
Uses the thermochemical calorie, 4.184 J.
The formula
value in cal = value in J × 0.2390057361
J- Input unit: joules
cal- Output unit: calories
How to use this calculator
- Enter a value in J.
- Multiply by the stored conversion factor.
- Read the result in cal; divide by the same factor to convert back.
Worked examples
Worked conversion
1 J × 0.2390057361 ≈ 0.2390057361 cal.
Reverse conversion
0.2390057361 cal ÷ 0.2390057361 ≈ 1 J. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 0.2390057361 cal per J. Uses the thermochemical calorie, 4.184 J.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
J to cal table
| J | cal (rounded) |
|---|---|
| 0 | 0 |
| 1 | 0.2390057361 |
| 2 | 0.4780114723 |
| 5 | 1.195028681 |
| 10 | 2.390057361 |
| 100 | 23.90057361 |
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