To convert calories to joules, multiply by 4.184.
The calculation uses 1 cal = 4.184 J. 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 J = value in cal × 4.184
cal- Input unit: calories
J- Output unit: joules
How to use this calculator
- Enter a value in cal.
- Multiply by the stored conversion factor.
- Read the result in J; divide by the same factor to convert back.
Worked examples
Worked conversion
1 cal × 4.184 ≈ 4.184 J.
Reverse conversion
4.184 J ÷ 4.184 ≈ 1 cal. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 4.184 J per cal. 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.
cal to J table
| cal | J (rounded) |
|---|---|
| 0 | 0 |
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 100 | 418.4 |
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