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Kilojoules to Calories Converter

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

kJ

Calories

1,003.8241

cal

4.2 kJ = 1,003.8241 cal

cal = kJ × 239.006

Kilojoules to Calories: 1 kJ equals 239.00574 cal. To convert kilojoules to calories, multiply by 239.00574 (cal = kJ × 239.006). For example, 10 kJ = 2390.0574 cal.

How to Convert Kilojoules to Calories

To convert from kilojoules to calories, multiply the value by 239.00574. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Kilojoules to Calories: cal = kJ × 239.006
  • Calories to Kilojoules: kJ = cal ÷ 239.006

Kilojoules to Calories Conversion Chart

Kilojoules (kJ)Calories (cal)
0.123.900574
0.2559.751435
0.5119.50287
1239.00574
2478.01148
3717.01722
51195.0287
102390.0574
204780.1148
255975.1435
5011950.287
10023900.574
25059751.435
1000239005.74

Understanding the Units

What is a Kilojoule?

A kilojoule equals 1,000 joules.

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

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.

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FAQ

How do I convert kilojoules to calories?

Multiply by 239.006. For example, 4.2 kJ × 239.006 = 1,003.8241 cal.

What is the formula for kilojoules to calories?

The formula is: cal = kJ × 239.006.

How many calories are in one kilojoule?

One kilojoule equals 239.0057 calories.

How many calories are in 1 kilojoul?

1 kJ equals 239.00574 cal.

How do you convert kilojoules to calories?

Multiply the kilojoul value by 239.00574. Formula: cal = kJ × 239.006.

How many calories are in 5 kilojoules?

5 kJ = 1195.0287 cal.

How do you convert calories back to kilojoules?

Use the inverse formula: kJ = cal ÷ 239.006. For example, 1 cal = 0.004184 kJ.

What is the difference between Kilojoul and Calory?

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