Energy Converter

Convert between chemical, electrical and physical energy units.

Energy
6
Printable Chart
Related Conversions
1 J to kJ 10 J to kJ 25 J to kJ 50 J to kJ 100 J to kJ 250 J to kJ 500 J to kJ 1,000 J to kJ 5,000 J to kJ 8,800 J to kJ 25,000 J to kJ 80,000 J to kJ
Reverse Conversions
1 kJ to J 25 kJ to J 50 kJ to J 100 kJ to J 250 kJ to J 1,000 kJ to J 7,200 kJ to J 8,800 kJ to J 12,800 kJ to J 16,000 kJ to J 25,000 kJ to J 50,000 kJ to J
More Energy Conversions
100 J to cal 1 GJ to kWh 1 GJ to MJ 1 MJ to BTU 100 kJ to kcal 1 MJ to kWh 2 GJ to MJ 2 MJ to BTU 250 cal to J 1 kWh to cal

Trending Now

Days Until Christmas Days Until Thanksgiving Business Days 100 calories to joules 10 miles to km Days Since Week Number 150 pounds to kg Days Until Halloween 1 hectare to acres Weight Chart

Recent Tools

Popular Conversions

Kilowatt-Hours to Megajoules Megajoules to Kilowatt-Hours Joules to Calories Kilocalories to Kilojoules British Thermal Units to Joules Watt-Hours to Joules

Common Benchmarks

1 kWh 3.6 MJ
Boil 1 liter water 334 kJ
100 W bulb for 1 hour 0.1 kWh
Microwave 10 minutes 0.17 kWh
AA battery 10 kJ
Gasoline liter 34 MJ

Formula

kJ = J × 0.001

Example

Example: convert 8000.000000000001 joules to kilojoules.

8000.000000000001 J = 8 kJ

Conversion table

joules (J) kilojoules (kJ)
1 J 0.001 kJ
2 J 0.002 kJ
5 J 0.005 kJ
10 J 0.01 kJ
20 J 0.02 kJ
50 J 0.05 kJ
100 J 0.1 kJ

Explanation

These are both units.

How to convert joules to kilojoules

  1. Start with the value in joules (J).
  2. Multiply it by 0.001.
  3. The result is the measurement in kilojoules (kJ).

Example: 8000.000000000001 J → 8 kJ

Frequently Asked Questions

How much is 8000 joules in kilojoules?

8000 joules equals 8 kilojoules.

How many kilojoules is 1 joule?

1 joule equals 0.001 kilojoules.

How many joules is 1 kilojoule?

1 kilojoule equals 1000 joules.

What is the difference between joules and kilojoules?

Both measure energy in SI. The main difference is usually scale: some units are convenient for smaller values, while others are used to express larger values more practically.

Where are joules and kilojoules used?

They are used in physics and engineering to measure work, energy, and heat; the most practical unit depends on the magnitude.

Why does 1 joule equal 0.001 kilojoules?

Because the “kilo-” prefix means 1000. One kilojoule equals 1000 joules, so 1 joule corresponds to 0.001 kilojoules.