Megajoules To Watt Hours Conversion


1 MJ = 277.77777777778 Wh

Want to convert from watt hours to megajoules 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 megajoules to watt hours (MJ to Wh)

The formula for converting megajoules to watt hours is: Wh = MJ × 277.77777777778. To calculate the megajoule value in watt hours first substitute the megajoule value into the preceding formula, and then perform 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

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

Example Conversion

Let's take a look at an example. The step-by-step process to convert 8 megajoules to watt hours is:

  1. Understand the conversion formula: Wh = MJ × 277.77777777778
  2. Substitute the required value. In this case we substitute 8 for MJ so the formula becomes: Wh = 8 × 277.77777777778
  3. Calculate the result using the provided values. In our example the result is: 8 × 277.77777777778 = 2222.22222222224 Wh

In summary, 8 megajoules is equal to 2222.22222222224 watt hours.

Converting watt hours to megajoules

In order to convert the other way around i.e. watt hours to megajoules, you would use the following formula: MJ = Wh × 0.0036. To convert watt hours to megajoules first substitute the watt hour value into the above formula, and then execute 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

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

Conversion Unit Definitions

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.

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.

Megajoules To Watt Hours Conversion Table

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

Megajoule (MJ)Watt Hour (Wh)
1 MJ277.77777777778 Wh
2 MJ555.55555555556 Wh
3 MJ833.33333333334 Wh
4 MJ1111.11111111112 Wh
5 MJ1388.8888888889 Wh
6 MJ1666.66666666668 Wh
7 MJ1944.44444444446 Wh
8 MJ2222.22222222224 Wh
9 MJ2500.00000000002 Wh
10 MJ2777.7777777778 Wh
11 MJ3055.55555555558 Wh
12 MJ3333.33333333336 Wh
13 MJ3611.11111111114 Wh

Other Common Megajoule Conversions

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

1 megajoule in joules1000000 J
1 megajoule in kilojoules1000 kJ
1 megajoule in gigajoules0.001 GJ
1 megajoule in calories238845.8966275 cal
1 megajoule in kilocalories238.8458966275 kcal
1 megajoule in kilowatt hours0.27777777777778 kWh
1 megajoule in megawatt hours0.00027777777777778 MWh
1 megajoule in btus947.08628903179 Btu