Watt Hours To Megajoules Conversion


1 Wh = 0.0036 MJ

Want to convert from megajoules to watt hours instead?

Disclaimer: We've spent hundreds of hours building and testing our calculators and conversion tools. However, we cannot be held liable for any damages or losses (monetary or otherwise) arising out of or in connection with their use. Full disclaimer.

How to convert watt hours to megajoules (Wh to MJ)

The formula for converting watt hours to megajoules is: MJ = Wh × 0.0036. To calculate the watt hour value in megajoules first substitute the watt hour value into the preceding formula, and then perform the calculation. If we wanted to calculate 1 watt hour in megajoules we follow these steps:

MJ = Wh × 0.0036

MJ = 1 × 0.0036

MJ = 0.0036

In other words, 1 watt hour is equal to 0.0036 megajoules.

Example Conversion

Let's take a look at an example. The step-by-step process to convert 3 watt hours to megajoules is:

  1. Understand the conversion formula: MJ = Wh × 0.0036
  2. Substitute the required value. In this case we substitute 3 for Wh so the formula becomes: MJ = 3 × 0.0036
  3. Calculate the result using the provided values. In our example the result is: 3 × 0.0036 = 0.0108 MJ

In summary, 3 watt hours is equal to 0.0108 megajoules.

Converting megajoules to watt hours

In order to convert the other way around i.e. megajoules to watt hours, you would use the following formula: Wh = MJ × 277.77777777778. To convert megajoules to watt hours first substitute the megajoule value into the above formula, and then execute the calculation. If we wanted to calculate 1 megajoule in watt hours we follow these steps:

Wh = MJ × 277.77777777778

Wh = 1 × 277.77777777778

Wh = 277.77777777778

Or in other words, 1 megajoule is equal to 277.77777777778 watt hours.

Conversion Unit Definitions

What is a Watt Hour?

A watt-hour (Wh) is a unit of energy commonly used in the context of electricity consumption and production. It represents the amount of energy consumed or produced by a one-watt electrical device operating for one hour.
Mathematically, 1 watt-hour is equal to the energy used by a one-watt device over a period of one hour. It can also be expressed as: 1 Wh = 1 watt × 1 hour.
Watt-hours are used to measure the total energy usage of appliances, buildings, or entire power grids over a specific period of time. For example, if a 100-watt light bulb is turned on for 10 hours, it consumes 1,000 watt-hours or 1 kilowatt-hour (kWh) of electricity (since 1 kWh = 1,000 Wh).
Watt-hours are widely used by utility companies to measure and bill for electricity consumption by households and businesses.

What is a Megajoule?

A megajoule (MJ) is a metric unit of energy in the International System of Units (SI). One megajoule is equal to 1,000,000 joules or 1×106 joules. The prefix "mega-" signifies a factor of one million, so a megajoule is a large unit of energy, often used in contexts where significant amounts of energy are involved.
Megajoules are commonly used in various scientific, engineering, and industrial applications to measure large quantities of energy. For instance, in the field of nutrition, the energy content of food is sometimes measured in megajoules per serving. In energy-related contexts, such as electricity generation or large-scale industrial processes, the energy output or consumption is often expressed in megajoules.

Watt Hours To Megajoules Conversion Table

Below is a lookup table showing common watt hours to megajoules conversion values.

Watt Hour (Wh)Megajoule (MJ)
1 Wh0.0036 MJ
2 Wh0.0072 MJ
3 Wh0.0108 MJ
4 Wh0.0144 MJ
5 Wh0.018 MJ
6 Wh0.0216 MJ
7 Wh0.0252 MJ
8 Wh0.0288 MJ
9 Wh0.0324 MJ
10 Wh0.036 MJ
11 Wh0.0396 MJ
12 Wh0.0432 MJ
13 Wh0.0468 MJ

Other Common Watt Hour Conversions

Below is a table of common conversions from watt hours to other energy units.

1 watt hour in joules3600 J
1 watt hour in kilojoules3.6 kJ
1 watt hour in calories859.84522785899 cal
1 watt hour in kilowatt hours0.001 kWh
1 watt hour in megawatt hours0.000001 MWh
1 watt hour in watt seconds3600 Ws
1 watt hour in btus3.4144259497 Btu