To use the joules to calories conversion calculator, enter the energy value in joules and select the desired calorie unit type. Click the “Convert” button to instantly calculate the energy in calories. Use the “Reset” button to clear the inputs and start a new conversion.
Joules to Calories Conversion Calculator
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Calories to joules conversion ►
Small & Large Calories
A small calorie (cal) represents the amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius under a pressure of 1 atmosphere.
On the other hand, a large calorie (Cal) signifies the energy needed to raise the temperature of 1 kilogram of water by 1 degree Celsius at a pressure of 1 atmosphere. The large calorie is commonly referred to as a food calorie and serves as a unit of measurement for food energy.
1 large calorie is equal to 1000 small calories (1 Cal = 1000 cal = 1 kcal).
How to Convert from Joules to Calories?
Joules to Thermochemical Calories
1 calth = 4,184 J
The amount of energy expressed in thermochemical calories, denoted as E(calth), can be obtained by dividing the energy measured in joules, denoted as E(J), by the conversion factor 4,184:
E(cal) = E(J) / 4,184 = 0.239005736 * E(J)
Example
Let’s say we have an amount of energy equal to 500 joules. We want to convert this to thermochemical calories.
To convert joules to thermochemical calories, we can use the conversion factor of 1 joule = 0.239005736 thermochemical calories.
So, to convert 500 joules to thermochemical calories, we can multiply the value by the conversion factor:
500 joules * 0.239005736 thermochemical calories/joule = 119.502868 thermochemical calories.
Joules to 15°C Calories
1 cal15 = 4,1855 J
The energy represented in 15 degrees Celsius calories E(cal15) can be obtained by dividing the energy measured in joules E(J) by the conversion factor 4,1855.
E(cal) = E(J) / 4,1855 = E(J) * 0.23892008123
Example
Let’s say we have 500 joules of energy that we want to convert to 15°C calories.
The conversion factor from joules to calories is 1 joule = 0.23892008123 calories (at 15°C).
To convert 500 joules to calories, we can use the conversion factor:
500 joules * 0.23892008123 calories/joule = 119.4600406164 calories (at 15°C).
Joules to Large/Food Calories
1 Cal = 4,184 kJ = 4184 J
The energy in large/food calories E(Cal) can be determined by dividing the energy in joules E(J) by 4184:
E(Cal) = E(J) / 4184 = 0.000239005736 * E(J)
Example
Let’s say we have 5000 joules of energy and we want to convert it to large/food calories:
Energy in joules = 5000 joules
Conversion factor = 0.000239005736 calories/joule
To convert joules to large/food calories, we multiply the energy in joules by the conversion factor:
Energy in calories = 5000 joules * 0.000239005736 calories/joule.
Calculating this, we get:
Energy in calories = 1.19502868 Cal
Therefore, 5000 joules is approximately equal to 1.195 large/food calories.
Joule to Calorie Conversion Table
Table showing various joule measurements converted to thermochemical calories.
| Joules | Calories |
|---|---|
| 1 J | 0.239006 cal |
| 2 J | 0.478011 cal |
| 3 J | 0.717017 cal |
| 4 J | 0.956023 cal |
| 5 J | 1.195 cal |
| 6 J | 1.434 cal |
| 7 J | 1.673 cal |
| 8 J | 1.912 cal |
| 9 J | 2.1511 cal |
| 10 J | 2.3901 cal |
| 11 J | 2.6291 cal |
| 12 J | 2.8681 cal |
| 13 J | 3.1071 cal |
| 14 J | 3.3461 cal |
| 15 J | 3.5851 cal |
| 16 J | 3.8241 cal |
| 17 J | 4.0631 cal |
| 18 J | 4.3021 cal |
| 19 J | 4.5411 cal |
| 20 J | 4.7801 cal |
| 21 J | 5.0191 cal |
| 22 J | 5.2581 cal |
| 23 J | 5.4971 cal |
| 24 J | 5.7361 cal |
| 25 J | 5.9751 cal |
| 26 J | 6.2141 cal |
| 27 J | 6.4532 cal |
| 28 J | 6.6922 cal |
| 29 J | 6.9312 cal |
| 30 J | 7.1702 cal |
| 31 J | 7.4092 cal |
| 32 J | 7.6482 cal |
| 33 J | 7.8872 cal |
| 34 J | 8.1262 cal |
| 35 J | 8.3652 cal |
| 36 J | 8.6042 cal |
| 37 J | 8.8432 cal |
| 38 J | 9.0822 cal |
| 39 J | 9.3212 cal |
| 40 J | 9.5602 cal |
