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Kilojoules to Joules converter

Convert kJ to J instantly. Type any value and get the result in joules. 1 kJ = 1,000 J.

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Energy›kJ → J
From
To
result below ↓
1 kJ=
1,000J
formula1 kJ = 1,000 J

Common kilojoules → joules

=1,000 J
=2,000 J
=5,000 J
=10,000 J
=20,000 J
=50,000 J
=100,000 J
=500,000 J
=1,000,000 J

Need a different value? .

Convert the other way
Joules to Kilojoules

How to convert kilojoules to joules

To convert kilojoules to joules, multiply the value by 1,000.

Formula
J = kJ × 1,000

For example:

  • →5 kJ = 5,000 J
  • →100 kJ = 100,000 J

Quick reference

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

When you need to convert kJ to J

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

Related conversions

Joules to Kilojoules
1 J = 0.001 kJ
Kilojoules to Calories
1 kJ = 239.006 cal
Kilojoules to Kilocalories
1 kJ = 0.239006 kcal
Kilojoules to Watt-hours
1 kJ = 0.277778 Wh
Calories to Joules
1 cal = 4.184 J
Kilocalories to Joules
1 kcal = 4,184 J
Watt-hours to Joules
1 Wh = 3,600 J
Kilowatt-hours to Joules
1 kWh = 3,600,000 J
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