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Kilocalories to Kilojoules Converter (kcal to kJ)

1 kcal = 4.184 kJ. Type any value to convert kilocalories to kilojoules.

1 kcal = 4.184 kJ

Formula: kJ = kcal × 4.184

Common values
Decimals
In every unit 12 units
Joule (J) 4,184 J
Kilojoule (kJ) 4.184 kJ
Megajoule (MJ) 0.004184 MJ
Calorie (cal) 1,000 cal
Kilocalorie (kcal) 1 kcal
Watt-hour (Wh) 1.162222222 Wh
Kilowatt-hour (kWh) 0.001162222222 kWh
Electronvolt (eV) 2.611447397 × 10²² eV
British thermal unit (BTU) 3.965666831 BTU
Therm (thm) 0.00003966613703 thm
Foot-pound (ft·lbf) 3,085.960033 ft·lbf
Erg (erg) 41,840,000,000 erg

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If you continue, the file is uploaded over an encrypted connection and converted on our server. You can keep using the site meanwhile. The original is deleted as soon as it is converted; the result is kept for 6 hours so you can download it, and you can delete it at any time. Files are never shared or used for anything else.

Calculated in your browser – nothing you type is sent anywhere. Privacy details

Kilocalories to kilojoules table

Formula: kJ = kcal × 4.184

Kilocalorie (kcal)Kilojoule (kJ)
0.1 kcal0.4184 kJ
0.25 kcal1.046 kJ
0.5 kcal2.092 kJ
1 kcal4.184 kJ
2 kcal8.368 kJ
3 kcal12.552 kJ
4 kcal16.736 kJ
5 kcal20.92 kJ
6 kcal25.104 kJ
7 kcal29.288 kJ
8 kcal33.472 kJ
9 kcal37.656 kJ
10 kcal41.84 kJ
12 kcal50.208 kJ
15 kcal62.76 kJ
20 kcal83.68 kJ
25 kcal104.6 kJ
30 kcal125.52 kJ
40 kcal167.36 kJ
50 kcal209.2 kJ
60 kcal251.04 kJ
75 kcal313.8 kJ
100 kcal418.4 kJ
150 kcal627.6 kJ
200 kcal836.8 kJ
250 kcal1,046 kJ
500 kcal2,092 kJ
1,000 kcal4,184 kJ

How to use: Kilocalories to Kilojoules

  1. 1 Type the value in kilocalories.
  2. 2 The result in kilojoules appears at once – or type in the kilojoules field to convert back.
  3. 3 Pick a common value, round to fewer decimals or swap the units with one click.
  4. 4 Copy the result, or open “In every unit” to see the value in all units of energy.

About this tool

Kilocalorie (kcal) is a unit of energy; 1 kcal = 4,184 J. Kilojoule (kJ) is a unit of energy (SI); 1 kJ = 1,000 J.

To convert kilocalories to kilojoules, multiply the value by 4.184 (kJ = kcal × 4.184). Example: 100 kcal = 418.4 kJ.

Calculated in your browser – nothing you type is sent anywhere.

Frequently asked questions

How do I convert kilocalories to kilojoules?

To convert kilocalories to kilojoules, multiply the value by 4.184: kJ = kcal × 4.184. For example 100 kcal = 418.4 kJ.

What is 1 kcal in kilojoules?

1 kcal = 4.184 kJ. The other way round, 1 kJ = 0.2390057361 kcal.

How exact is the result?

The converter uses the official definitions of both units and shows up to 10 significant digits; choose 0–6 decimals to round. Both units are defined exactly in terms of each other, so the factor itself is exact.

Can I convert other units of energy here?

Yes – choose any of the 12 units of energy in the From and To lists, or switch to another measurement at the top.

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