How many joules are in one calorie?
One small calorie equals exactly 4.184 joules in this converter.
Convert Joule (J) to Calorie (cal) instantly.
Formula
value × 0.239005736138
| Sample | Converted |
|---|---|
| 1 J | 0.239006 cal |
| 5 J | 1.195029 cal |
| 10 J | 2.390057 cal |
| 100 J | 23.900574 cal |
| 1,000 J | 239.005736 cal |
Convert joules to calories by dividing the joule value by 4.184. This uses the small calorie, which is common in chemistry, physics, and heat calculations.
Joules are the SI unit for energy, while small calories are often used in heat and chemistry contexts.
This conversion uses 4.184 joules per calorie.
A value of 41.84 J becomes 10 cal.
Use cal when working with older heat references, classroom chemistry, or thermodynamic examples that expect small calories.
Do not confuse small calories with food Calories, which are kilocalories.
When nutrition is the context, joules to kilocalories is usually the more appropriate conversion.
Joules are standard in SI calculations, but calories still appear in chemistry and heat-transfer material.
Converting joules to calories helps compare modern SI values with calorie-based references.
This is most useful for small-scale heat, classroom, and lab examples.
This page uses the small calorie, written cal.
One cal is 4.184 J.
A nutritional Calorie is different and equals 1000 small calories.
Food labels usually use Calories, meaning kilocalories.
If the source value is nutritional, convert to kcal instead of cal.
Use cal for small heat-energy calculations and chemistry-style references.
Definition: A joule is the SI unit of energy, work, and heat.
History/Origin: The joule became the standard SI unit for energy and work, named after James Prescott Joule.
Current use: J is used in physics, engineering, electricity, mechanics, thermodynamics, chemistry, and energy calculations.
Definition: A calorie is an energy unit equal to 4.184 joules in this converter.
History/Origin: Calories were widely used in heat measurement before SI joules became the dominant scientific energy unit.
Current use: cal is used in chemistry, thermodynamics examples, heat calculations, older references, and classroom energy problems.
| Joule [J] | Calorie [cal] |
|---|---|
| 0.01 J | 0.00239 cal |
| 0.1 J | 0.023901 cal |
| 1 J | 0.239006 cal |
| 2 J | 0.478011 cal |
| 5 J | 1.195029 cal |
| 10 J | 2.390057 cal |
| 20 J | 4.780115 cal |
| 50 J | 11.950287 cal |
| 100 J | 23.900574 cal |
1 J = 0.239006 cal
1 cal = 4.184 J
Formula: value × 0.239005736138
Example: 15 J = 3.585086 cal
Precision note: Use exactly 4.184 J per cal. Preserve decimals when heat or lab values require precision.
One small calorie equals exactly 4.184 joules in this converter.
418.4 J equals 100 cal.
No. A food Calorie is a kilocalorie, equal to 1000 small calories.