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Joules to Kilojoules converter

Convert J to kJ instantly. Type any value and get the result in kilojoules. 1 J = 0.001 kJ.

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Energy›J → kJ
From
To
result below ↓
1 J=
0.001kJ
formula1 J = 0.001 kJ

Common joules → kilojoules

=0.001 kJ
=0.002 kJ
=0.005 kJ
=0.01 kJ
=0.02 kJ
=0.05 kJ
=0.1 kJ
=0.5 kJ
=1 kJ

Need a different value? .

Convert the other way
Kilojoules to Joules

How to convert joules to kilojoules

To convert joules to kilojoules, multiply the value by 0.001.

Formula
kJ = J × 0.001

For example:

  • →5 J = 0.005 kJ
  • →100 J = 0.1 kJ

Quick reference

  • ▸1 J = 0.001 kJ
  • ▸1 kJ = 1,000 J

When you need to convert J 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 joule?
One joule equals 0.001 kilojoules.
How do I convert J to kJ in my head?
Multiply the value in joules by 0.001 to get kilojoules.
What is the formula for joules to kilojoules?
kJ = J × 0.001.
What is the reverse — how many joules in 1 kilojoule?
One kilojoule equals 1,000 joules.

Related conversions

Kilojoules to Joules
1 kJ = 1,000 J
Joules to Calories
1 J = 0.239006 cal
Joules to Kilocalories
1 J = 0.000239006 kcal
Joules to Watt-hours
1 J = 0.000277778 Wh
Calories to Kilojoules
1 cal = 0.004184 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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