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Calories to Kilojoules converter

Convert cal to kJ instantly. Type any value and get the result in kilojoules. 1 cal = 0.004184 kJ.

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Energy›cal → kJ
From
To
result below ↓
1 cal=
0.004184kJ
formula1 cal = 0.004184 kJ

Common calories → kilojoules

=0.004184 kJ
=0.008368 kJ
=0.02092 kJ
=0.04184 kJ
=0.08368 kJ
=0.2092 kJ
=0.4184 kJ
=2.092 kJ
=4.184 kJ

Need a different value? .

Convert the other way
Kilojoules to Calories

How to convert calories to kilojoules

To convert calories to kilojoules, multiply the value by 0.004184.

Formula
kJ = cal × 0.004184

For example:

  • →5 cal = 0.02092 kJ
  • →100 cal = 0.4184 kJ

Quick reference

  • ▸1 cal = 0.004184 kJ
  • ▸1 kJ = 239.006 cal

When you need to convert cal to kJ

  • ·Nutrition — converting calories to kilojoules on food labels.
  • ·Electricity bills — kWh consumption.
  • ·Heating — BTU ratings for furnaces.
  • ·Exercise — calorie burn during workouts.
  • ·Science — chemistry and physics problems.

Frequently asked

How many kilojoules are in 1 calorie?
One calorie equals 0.004184 kilojoules.
How do I convert cal to kJ in my head?
Multiply the value in calories by 0.004184 to get kilojoules.
What is the formula for calories to kilojoules?
kJ = cal × 0.004184.
What is the reverse — how many calories in 1 kilojoule?
One kilojoule equals 239.006 calories.

Related conversions

Kilojoules to Calories
1 kJ = 239.006 cal
Calories to Joules
1 cal = 4.184 J
Calories to Kilocalories
1 cal = 0.001 kcal
Calories to Watt-hours
1 cal = 0.00116222 Wh
Joules to Kilojoules
1 J = 0.001 kJ
Kilocalories to Kilojoules
1 kcal = 4.184 kJ
Watt-hours to Kilojoules
1 Wh = 3.6 kJ
Kilowatt-hours to Kilojoules
1 kWh = 3,600 kJ
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