How many joules are in one calorie?
One small calorie equals 4.184 joules.
Convert Calorie (cal) to Joule (J) instantly.
Formula
value × 4.184
| Sample | Converted |
|---|---|
| 1 cal | 4.184 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 100 cal | 418.4 J |
| 1,000 cal | 4,184 J |
Convert small calories to joules when a heat-energy value needs to be written in the SI unit used by modern science and engineering.
Small calories appear in heat and chemistry contexts, while joules are the standard SI unit for energy.
The conversion uses 4.184 joules per small calorie.
A value of 100 cal equals 418.4 J.
This page is useful when older heat-energy examples need to be expressed in modern SI terms.
Be careful not to mix small calories with kilocalories used in food and fitness tracking.
For scientific writing, joules usually make it easier to combine energy with watts, newtons, meters, and seconds.
The small calorie is an older heat-energy unit.
The joule is the standard SI energy unit.
Converting calories to joules makes older thermal values easier to use in modern calculations.
The abbreviation cal means small calorie here.
Nutrition labels often use Calorie to mean kilocalorie.
That difference changes the result by a factor of 1000, so the source unit matters.
Joules work well when comparing heat with work, power, or electrical energy.
They also fit directly into SI equations.
Use joules as the calculation unit and round the final value for presentation.
Definition: A small calorie is a heat-energy unit equal to 4.184 joules in this converter.
History/Origin: Calories were historically used to describe heat before joules became the standard SI energy unit.
Current use: Small calories appear in chemistry examples, heat calculations, older references, and detailed energy comparisons.
Definition: A joule is the SI unit of energy, work, and heat.
History/Origin: The joule is named after James Prescott Joule and is now the standard scientific unit for energy transfer.
Current use: Joules are used in physics, chemistry, engineering, mechanics, electricity, heat transfer, and scientific reporting.
| Calorie [cal] | Joule [J] |
|---|---|
| 0.01 cal | 0.04184 J |
| 0.1 cal | 0.4184 J |
| 1 cal | 4.184 J |
| 2 cal | 8.368 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 20 cal | 83.68 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
1 cal = 4.184 J
1 J = 0.239006 cal
Formula: value × 4.184
Example: 15 cal = 62.76 J
Precision note: This converter uses 1 cal = 4.184 J. Confirm that the source is small calories, not food Calories or kilocalories.
One small calorie equals 4.184 joules.
No. This page uses the small calorie. A food Calorie is a kilocalorie, equal to 1000 small calories.
250 cal equals 1046 J.