Convert Kilowatt-Hour to Kilojoule (kWh → kJ)

The kilowatt-hour is the universal billing unit for residential electricity consumption around the world.

Kilowatt-Hour

Kilojoule

3,600

1 kWh3,600 kJNIST · BIPM accuracy

Kilowatt-Hour to Kilojoule Conversion Table

10 common values

Kilowatt-Hour	Kilojoule
1 kWh	3,600 kJ
10 kWh	36,000 kJ
100 kWh	360,000 kJ
500 kWh	1,800,000 kJ
1,000 kWh	3,600,000 kJ
5,000 kWh	18,000,000 kJ
10,000 kWh	36,000,000 kJ
50,000 kWh	180,000,000 kJ
100,000 kWh	360,000,000 kJ
500,000 kWh	1,800,000,000 kJ

How to Convert Kilowatt-Hour to Kilojoule Manually

Step by Step

Converting kilowatt-hours to kilojoules is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1
Take your value in kilowatt-hours
Start with the number of kilowatt-hours (kWh) you want to convert.
2
Multiply by 3,600
The conversion factor from kWh to kJ is 3,600. Multiply your value by this number.
3
Read the result in kilojoules
The result is your value in kilojoules (kJ).

Practical Examples

1 kWh

equals

3,600 kJ

5 kWh

equals

18,000 kJ

10 kWh

equals

36,000 kJ

25 kWh

equals

90,000 kJ

100 kWh

equals

360,000 kJ

Formula

Multiply the value in kilowatt-hours by 3,600. For the reverse direction, multiply by 0.000278.

ForwardkJ = kWh × 3,600

ReversekWh = kJ × 0.000278

Example: 10 kWh × 3,600 = 36,000 kJ

Tips

Use these in everyday conversions

1 kWh = 3.6 MJ = 3,600,000 J.
Multiply device power (kW) × time (h) = energy (kWh).
EV "range anxiety" translates to knowing kWh available.

Common Mistakes

Avoid these

Confusing kWh (energy) with kW (power).
Calculating electric costs by power ignoring duration.
Using "kWh/h" — redundant; it's just kW.

About Kilowatt-Hour and Kilojoule

What is the Kilowatt-Hour?

The kilowatt-hour equals 1,000 watt-hours (3.6 megajoules) and is the universal billing unit for residential electricity consumption around the world. A typical US household uses about 800–1,000 kWh per month; a refrigerator consumes 1–2 kWh per day, an LED bulb at 10 W for 10 hours uses 0.1 kWh, and a Tesla Model 3 has a 75 kWh battery (about 250–350 miles of range). Electric utility rates are quoted in cents per kWh — typical US residential rates are 11–25 ¢/kWh, while industrial rates are lower. The kilowatt-hour is essential in renewable-energy planning: solar panel output, wind farm production, and grid-scale storage are all rated in kWh or MWh (megawatt-hours). It relates to the watt-hour (1,000 Wh = 1 kWh), the joule (1 kWh = 3.6 MJ), the BTU (1 kWh ≈ 3,412 BTU), and the megawatt-hour (1,000 kWh = 1 MWh).

Electricity billing globally
EV battery capacity specifications
Home solar and battery storage

Real-world examples

UK home: ~2900 kWh/year. Tesla Model 3 battery: 60–80 kWh. Typical EV efficiency: 15–20 kWh/100 km.

What is the Kilojoule?

The kilojoule equals 1,000 joules and is the standard unit on European nutrition labels and in mid-scale chemical and physical calculations. EU regulations require food packaging to display energy in kilojoules (typically with kilocalories also shown for consumer familiarity): a chocolate bar might show '2,100 kJ / 500 kcal' per 100 g. The kilojoule is also common in chemistry (bond energies), electrical engineering (capacitor storage), and small-mechanical-energy contexts. A car battery typically stores about 1,800 kJ; lifting a person 1 meter requires roughly 0.7 kJ. The kilojoule relates to the joule (1,000 J = 1 kJ), the kilocalorie (1 kcal = 4.184 kJ), the watt-hour (1 kWh = 3,600 kJ), and the megajoule (1,000 kJ = 1 MJ). The conversion factor 4.184 (kJ per kcal) is one of the most-used numbers in nutrition labeling.