Convert joules to calories
Convert joules to calories by entering a value below.
How to Convert Joules to Calories
The joule and calorie are both units of energy. 1 calorie equals 4.184 joules. This means to convert joules to calories, you divide by 4.184.
Formula
Step-by-Step Example
Convert 5 J to calories:
We need to convert joules to calories
Since 1 cal = 4.184 J, divide by 4.184
5 ÷ 4.184 = 1.1950286807
5 J = 1.1950286807 cal
Joule to Calorie Conversion Table
Quick reference table for common joule to calorie conversions. Click any value for detailed calculation.
| Joules (J) | Calories (cal) |
|---|---|
| 1 J | 0.2390057361 cal |
| 2 J | 0.4780114723 cal |
| 5 J | 1.1950286807 cal |
| 10 J | 2.3900573614 cal |
| 15 J | 3.5850860421 cal |
| 20 J | 4.7801147228 cal |
| 25 J | 5.9751434034 cal |
| 50 J | 11.950286807 cal |
| 100 J | 23.900573614 cal |
About These Units
Joule (J)
The joule (J) is the SI unit of energy equal to one watt-second or one newton-meter. Joules measure work, heat, and electrical energy. One joule equals approximately 0.239 calories. Lifting a 100g apple one meter requires about 1 joule. Named after physicist James Prescott Joule.
Calorie (cal)
A small calorie (cal) is the energy needed to raise 1 gram of water by 1°C, equal to 4.184 joules. Small calories are used in chemistry and physics. Note: food "Calories" (with capital C) are actually kilocalories. One calorie equals 0.003968 BTU.
Frequently Asked Questions
How do I convert joules to calories?
To convert joules to calories, divide the value by 4.184. For example, 10 J = 2.3900573614 cal.
How many calories are in 1 joule?
1 joule equals 0.2390057361 calories.
What is the formula for joules to calories?
The formula is: cal = J ÷ 4.184.