Energy Converter

Convert between chemical, electrical and physical energy units.

Energy
6
Printable Chart
Related Conversions
1 J to kJ 5 J to kJ 25 J to kJ 100 J to kJ 169 J to kJ 185 J to kJ 370 J to kJ 1,000 J to kJ 1,540 J to kJ 2,500 J to kJ 10,000 J to kJ 25,000 J to kJ
Reverse Conversions
5 kJ to J 10 kJ to J 123 kJ to J 185 kJ to J 370 kJ to J 616 kJ to J 1,000 kJ to J 1,540 kJ to J 3,080 kJ to J 5,000 kJ to J 10,000 kJ to J 25,000 kJ to J
More Energy Conversions
1 MJ to BTU 100 J to cal 1 GJ to kWh 1 GJ to MJ 2 MJ to BTU 100 kJ to kcal 1 MJ to kWh 2 GJ to MJ 10 BTU to J

Trending Now

Days Until New Year Days Until Halloween 90 minutes to hours PSI to bar 10 miles to km Business Days Days Until Christmas FIFA World Cup 2026 212 °F to °C Week Number Metric 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

Phone battery 40 kJ
Cup of coffee 5 kJ
Match stick 1 kJ
Boil 1 liter water 334 kJ
Laptop full charge 200 kJ
Gasoline liter 34 MJ

Formula

kJ = J × 0.001

Example

Example: convert 154 joules to kilojoules.

154 J = 0.154 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: 154 J → 0.154 kJ

Frequently Asked Questions

How much is 154 joules in kilojoules?

154 joules equals 0.154 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.