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Calories to Kilojoules Converter

Convert calories to kilojoules and back instantly with formula and common values.

cal

Kilojoules

0.0176

kJ

4.2 cal = 0.0176 kJ

kJ = cal × 0.004184

Calories to Kilojoules: 1 cal equals 0.004184 kJ. To convert calories to kilojoules, multiply by 0.004184 (kJ = cal × 0.004184). For example, 10 cal = 0.04184 kJ.

How to Convert Calories to Kilojoules

To convert from calories to kilojoules, multiply the value by 0.004184. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Calories to Kilojoules: kJ = cal × 0.004184
  • Kilojoules to Calories: cal = kJ ÷ 0.004184

Calories to Kilojoules Conversion Chart

Calories (cal)Kilojoules (kJ)
0.10.000418
0.250.001046
0.50.002092
10.004184
20.008368
30.012552
50.02092
100.04184
200.08368
250.1046
500.2092
1000.4184
2501.046
10004.184

Understanding the Units

What is a Calorie?

The thermochemical calorie equals exactly 4.184 joules; the historical "small" calorie raised one gram of water by one degree Celsius.

Common contexts: chemistry, historical thermodynamics.

What is a Kilojoule?

A kilojoule equals 1,000 joules.

Common contexts: nutrition labeling (outside US), mechanical engineering.

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FAQ

How do I convert calories to kilojoules?

Multiply by 0.004184. For example, 4.2 cal × 0.004184 = 0.0176 kJ.

What is the formula for calories to kilojoules?

The formula is: kJ = cal × 0.004184.

How many kilojoules are in one calorie?

One calorie equals 0.0042 kilojoules.

How many kilojoules are in 1 calory?

1 cal equals 0.004184 kJ.

How do you convert calories to kilojoules?

Multiply the calory value by 0.004184. Formula: kJ = cal × 0.004184.

How many kilojoules are in 5 calories?

5 cal = 0.02092 kJ.

How do you convert kilojoules back to calories?

Use the inverse formula: cal = kJ ÷ 0.004184. For example, 1 kJ = 239.005736 cal.

What is the difference between Calory and Kilojoul?

The thermochemical calorie equals exactly 4.184 joules; the historical "small" calorie raised one gram of water by one degree Celsius. A kilojoule equals 1,000 joules.