Convert kilowatt-hours to kilojoules

1 kWh=3,600kJ

Use the converter below to change any kilowatt-hours value into kilojoules instantly — with formula, conversion table, and real-world examples.

You have

Equals

3,600

Conversion formula

Forward

kilojoules = kilowatt-hours × 3,600

Reverse

kilowatt-hours = kilojoules × 0.0002778

Example: 10 kWh × 3,600 = 36,000 kJ.

About both units

From

Kilowatt-Hour

kWh

The kilowatt-hour equals 3.6 megajoules — energy delivered by 1 kW for 1 hour. It is the standard unit on electricity bills worldwide. A UK home uses about 2900 kWh/year; an EV charge adds 10–80 kWh depending on battery.

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

Read full kilowatt-hour reference →

Kilojoule

The kilojoule equals 1000 joules. Used on European nutrition labels (required by EU law alongside kcal), for mechanical work specifications, and some engineering contexts. A 100 g chocolate bar contains about 2100 kJ.

Real-world: 100 g chocolate: ~2100 kJ. EU daily intake (adult): ~8400 kJ. Tesla Model 3 battery: ~270 MJ = 270,000 kJ.

Read full kilojoule reference →

Kilowatt-Hour to Kilojoule conversion table

Common kilowatt-hours to kilojoules values for quick reference.

Kilowatt-Hour (kWh)	Kilojoule (kJ)
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

Tips & common mistakes

Quick tips

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.

Avoid these

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

Frequently asked questions

How many kilojoules in a kilowatt-hour?

One kilowatt-hour equals 3,600 kilojoules.

How do I convert kilowatt-hours to kilojoules?

Multiply the kilowatt-hour value by 3,600 to get the equivalent in kilojoules.

What is 100 kilowatt-hours in kilojoules?

100 kilowatt-hours equals 360,000 kilojoules.

Is a kilowatt-hour bigger than a kilojoule?

Yes. 1 kilowatt-hour equals 3,600 kilojoules, so one kilowatt-hour is larger.

How to convert kilowatt-hours to kilojoules without a calculator?

Multiply by 3,600 for a quick estimate; use a calculator for precise results.

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