J to cal Converter - Joule to Calorie
Joule (J) to Calorie (cal)
Direct answer
1 J = 0.239005736138 cal
cal = J × 0.239005736138
Converter
Conversion formula
cal = J × 0.239005736138
J = cal × 4.184
Example: 10 J = 10 × 0.239005736138 = 2.39005736138 cal.
Common conversion table
| J | cal |
|---|---|
| 1 J | 0.239005736138 cal |
| 2 J | 0.478011472275 cal |
| 5 J | 1.19502868069 cal |
| 10 J | 2.39005736138 cal |
| 20 J | 4.78011472275 cal |
| 50 J | 11.9502868069 cal |
| 100 J | 23.9005736138 cal |
| 1,000 J | 239.005736138 cal |
Conversion derivation
Express both J and cal in the same base unit J (joule), then cancel the shared base unit.
- 1
Rewrite J in the base unit
- 2
Rewrite cal in the base unit
- 3
Forward conversion
- 4
Reverse conversion
AI explanation for this conversion
This pre-generated explanation is schema-checked. Numeric results still come from the page formula and calculator.
Joule to Calorie Conversion Factor Explanation
This conversion factor relates the joule, the SI unit of energy, to the calorie, a unit historically defined via heat. The factor is derived by expressing both units in terms of the joule.
Definition
The calorie (cal) is defined as exactly 4.184 joules. This exact definition sets the conversion factor.
Principle
The principle is to express both units in the same base unit (joule). Since 1 calorie equals 4.184 joules, dividing 1 joule by 4.184 gives the equivalent calories.
Assumptions
- This conversion uses the thermochemical calorie (cal), which is exactly 4.184 J.
- The conversion factor is exact by definition of the calorie.
Cautions
- The calorie has multiple definitions (e.g., International Steam Table, mean calorie). This conversion is for the thermochemical calorie.
- For nutrition labeling, a 'Calorie' (capital C) is actually a kilocalorie (kcal).
FAQ
How many cal are in 1 J?
1 J = 0.239005736138 cal.
How many cal are in 10 J?
10 J = 2.39005736138 cal.
How many cal are in 100 J?
100 J = 23.9005736138 cal.
What is the formula to convert J to cal?
Use cal = J × 0.239005736138.
How many J are in 1 cal?
1 cal = 4.184 J.
What should I check when converting J to cal?
Use the conversion factor and round the result to the precision required by your calculation.