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Kilowatt Hours to Megajoules Converter

Convert kilowatt hours to megajoules and back instantly with formula and common values.

kWh

Megajoules

27

MJ

7.5 kWh = 27 MJ

MJ = kWh × 3.6

Kilowatt Hours to Megajoules: 1 kWh equals 3.6 MJ. To convert kilowatt hours to megajoules, multiply by 3.6 (MJ = kWh × 3.6). For example, 10 kWh = 36 MJ.

How to Convert Kilowatt Hours to Megajoules

To convert from kilowatt hours to megajoules, multiply the value by 3.6. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Kilowatt Hours to Megajoules: MJ = kWh × 3.6
  • Megajoules to Kilowatt Hours: kWh = MJ ÷ 3.6

Kilowatt Hours to Megajoules Conversion Chart

Kilowatt Hours (kWh)Megajoules (MJ)
0.10.36
0.250.9
0.51.8
13.6
27.2
310.8
518
1036
2072
2590
50180
100360
250900
10003600

Understanding the Units

What is a Kilowatt Hour?

A kilowatt-hour equals exactly 3,600,000 joules — the energy delivered by 1 kW of power over one hour. It is the standard unit on electric utility bills.

Common contexts: electricity billing, home energy, EV battery capacity.

What is a Megajoule?

A megajoule equals one million joules (10⁶ J).

Common contexts: fuel energy content, industrial processes.

Real-World Reference Points

Item Kilowatt Hours (kWh) Megajoules (MJ)
Running a 100 W bulb for 10 h13.6
EV (Tesla Model 3 LR battery)75270
US household monthly average8933214.8

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FAQ

How do I convert kilowatt hours to megajoules?

Multiply by 3.6. For example, 7.5 kWh × 3.6 = 27 MJ.

What is the formula for kilowatt hours to megajoules?

The formula is: MJ = kWh × 3.6.

How many megajoules are in one kilowatt hour?

One kilowatt hour equals 3.6 megajoules.

How many megajoules are in 1 kilowatt hour?

1 kWh equals 3.6 MJ.

How do you convert kilowatt hours to megajoules?

Multiply the kilowatt hour value by 3.6. Formula: MJ = kWh × 3.6.

How many megajoules are in 5 kilowatt hours?

5 kWh = 18 MJ.

How do you convert megajoules back to kilowatt hours?

Use the inverse formula: kWh = MJ ÷ 3.6. For example, 1 MJ = 0.277778 kWh.

What is the difference between Kilowatt Hour and Megajoul?

A kilowatt-hour equals exactly 3,600,000 joules — the energy delivered by 1 kW of power over one hour. It is the standard unit on electric utility bills. A megajoule equals one million joules (10⁶ J).