Joule to Calorie Converter

One Joule equals 0.2390057361 Calorie (1 J = 0.2390057361 cal). Multiply a Joule value by 0.2390057361 to get the equivalent in Calorie. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.

Formula

cal = J × 0.2390057361

Multiply the Joule value by 0.2390057361 to get the equivalent value in Calorie.

Example Conversions

1 Joule (J)

0.2390057361 Calorie (cal)

5 Joule (J)

1.195028681 Calorie (cal)

10 Joule (J)

2.390057361 Calorie (cal)

25 Joule (J)

5.975143403 Calorie (cal)

100 Joule (J)

23.90057361 Calorie (cal)

Conversion Table

Common conversion values from Joule to Calorie
Joule (J) Calorie (cal)
0.1 0.02390057361
0.5 0.1195028681
1 0.2390057361
2 0.4780114723
5 1.195028681
10 2.390057361
25 5.975143403
50 11.95028681
100 23.90057361
250 59.75143403
500 119.5028681
1000 239.0057361

How to Convert Manually

Use these steps to convert Joule values to Calorie without the calculator.

  1. Write down the value in Joule (J) that you want to convert.
  2. Multiply that value by 0.2390057361.
  3. For example, 10 Joule × 0.2390057361 = 2.390057361 Calorie.
  4. Label the result as Calorie (cal).

Relative Size Comparison

1 Joule
1J
1 Calorie4.184Joules
1cal

This chart shows the visual difference in size between exactly one Joule and one Calorie.

About Joule and Calorie

The joule is the SI derived unit of energy — the work done by a force of one newton over one meter. Physics, chemistry, and food labeling outside the US build on it. The calorie (small calorie) is exactly 4.184 joules — the thermochemical convention, originally the heat to warm one gram of water by 1 °C. Chemistry uses it; food 'Calories' are actually kilocalories. One Joule equals 0.2390057361 Calorie (1 J = 0.2390057361 cal). Joule to Calorie conversion comes up most often in physics and engineering calculations and in food energy labeling outside the US, typically when figures need restating for chemistry heat calculations.

Precision and Rounding: Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15 Joule equals 3.585086042 Calorie.

15 J × 0.2390057361 = 3.585086042 cal

FAQ

How do I convert Joule to Calorie?

Multiply the Joule value by 0.2390057361 to get the equivalent value in Calorie.

What is the formula for Joule to Calorie?

The formula is cal = J × 0.2390057361.

How many Calorie are in 1 Joule?

1 Joule equals 0.2390057361 Calorie.

Can I convert Calorie back to Joule?

Yes. 1 Calorie equals 4.184 Joule, and the related converter can reverse the calculation.

What are common names for Joule and Calorie?

Joule is shown as J and may also be searched as joule, joules. Calorie is shown as cal and may also be searched as calorie, calories, small calorie.

Was this page helpful?

Let us know if this converter met your needs.

Related Converters