Energy Converter

Convert between chemical, electrical and physical energy units.

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Related Conversions
1 J to kWh 10 J to kWh 16.2 J to kWh 19.8 J to kWh 25 J to kWh 36 J to kWh 72 J to kWh 180 J to kWh 360 J to kWh 500 J to kWh 2,500 J to kWh 5,000 J to kWh
Reverse Conversions
16.2 kWh to J 19.8 kWh to J 43.2 kWh to J 50 kWh to J 72 kWh to J 100 kWh to J 360 kWh to J 500 kWh to J 5,000 kWh to J 10,000 kWh to J 25,000 kWh to J 100,000 kWh 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 250 cal to J

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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

100 W bulb for 1 hour 0.1 kWh
Phone battery 40 kJ
AA battery 10 kJ
Gasoline liter 34 MJ
Laptop full charge 200 kJ
Slice of bread 330 kJ

Formula

kWh = J × 2.77777778e-7

Example

Example: convert 18 joules to kilowatt-hours.

18 J = 0.000005 kWh

Conversion table

joules (J) kilowatt-hours (kWh)
1 J 2.77777778e-7 kWh
2 J 5.55555556e-7 kWh
5 J 0.00000139 kWh
10 J 0.00000278 kWh
20 J 0.00000556 kWh
50 J 0.00001389 kWh
100 J 0.00002778 kWh

Explanation

These are both units.

How to convert joules to kilowatt-hours

  1. Start with the value in joules (J).
  2. Multiply it by 2.77777778e-7.
  3. The result is the measurement in kilowatt-hours (kWh).

Example: 18 J → 0.000005 kWh

Frequently Asked Questions

How much is 18 joules in kilowatt-hours?

18 joules equals 0.000005 kilowatt-hours.

What is a joule?

A joule is a unit of energy.

What is a kilowatt-hour?

A kilowatt-hour is a unit of energy.

When are joules used?

It is used when working with energy measurements.

When are kilowatt-hours used?

It is used when working with energy measurements.

Why do some conversions produce very small or very large numbers?

The result can look tiny or huge because the units are meant for very different scales. A joule is used for everyday scales, while a kilowatt-hour is used for much larger scales. That’s why 1 kilowatt-hour equals 3,600,000 joules.