Convert kilowatt-hours to megajoules

1 kWh=3.6MJ

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

You have

Equals

3.6

Conversion formula

Forward

megajoules = kilowatt-hours × 3.6

Reverse

kilowatt-hours = megajoules × 0.2778

Example: 10 kWh × 3.6 = 36 MJ.

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 →

Megajoule

The megajoule equals 1,000,000 joules. Used for fuel energy content, large-scale mechanical work and in some European natural-gas billing. A litre of petrol contains about 34 MJ of energy.

Real-world: 1 L petrol: ~34 MJ. 1 L diesel: ~38 MJ. Tesla Model 3 full charge: ~270 MJ.

Read full megajoule reference →

Kilowatt-Hour to Megajoule conversion table

Common kilowatt-hours to megajoules values for quick reference.

Kilowatt-Hour (kWh)	Megajoule (MJ)
1 kWh	3.6 MJ
10 kWh	36 MJ
100 kWh	360 MJ
500 kWh	1,800 MJ
1,000 kWh	3,600 MJ
5,000 kWh	18,000 MJ
10,000 kWh	36,000 MJ
50,000 kWh	180,000 MJ
100,000 kWh	360,000 MJ
500,000 kWh	1,800,000 MJ

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 megajoules in a kilowatt-hour?

One kilowatt-hour equals 3.6 megajoules.

How do I convert kilowatt-hours to megajoules?

Multiply the kilowatt-hour value by 3.6 to get the equivalent in megajoules.

What is 100 kilowatt-hours in megajoules?

100 kilowatt-hours equals 360 megajoules.

Is a kilowatt-hour bigger than a megajoule?

Yes. 1 kilowatt-hour equals 3.6 megajoules, so one kilowatt-hour is larger.

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

Multiply by 3.6 for a quick estimate; use a calculator for precise results.

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