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Megajoules to Watt-hours conversion

Megajoules to Watt-hours conversion table

Megajoules (MJ)	Watt-hours (Wh)
0	0
1	277.77777777778
2	555.55555555556
3	833.33333333333
4	1111.1111111111
5	1388.8888888889
6	1666.6666666667
7	1944.4444444444
8	2222.2222222222
9	2500
10	2777.7777777778
20	5555.5555555556
30	8333.3333333333
40	11111.111111111
50	13888.888888889
60	16666.666666667
70	19444.444444444
80	22222.222222222
90	25000
100	27777.777777778
1000	277777.77777778

How to convert megajoules to watt-hours?

A megajoule (MJ) is a unit of energy measurement equal to one million joules. To convert megajoules to watt-hours (Wh), you can use the following conversion factor:

1 joule = 1 watt-second (W·s) 1 megajoule (MJ) = 1,000,000 joules (J) = 1,000,000 watt-seconds (W·s)

Since there are 3600 seconds in one hour (1 hour = 3600 seconds), we can convert watt-seconds to watt-hours:

$1 watt-hour (Wh) = 3600 watt-seconds (W·s)$

Therefore, to convert megajoules to watt-hours:

$\text{Watt-hours (Wh)} = \text{Megajoules (MJ)} \times \left(\frac{1,000,000}{3600}\right)$

For 1 megajoule:

$1 \text{ MJ} = 1 \times \frac{1,000,000}{3600}$ $= \frac{1,000,000}{3600}$ $\approx 277.78 \text{ Wh}$

So, 1 megajoule is approximately 277.78 watt-hours.

Real-World Examples Using Megajoules

1 MJ (Approx. 277.78 Wh)
- This amount of energy could power a 100-watt light bulb for about 2 hours and 46 minutes (since 100 W × 2.78 hours ≈ 278 Wh).
10 MJ (Approx. 2777.78 Wh)
- This amount of energy is equivalent to the electricity required to run a medium-sized refrigerator (typically around 200 watts) for about 13.89 hours (since 200 W × 13.89 hours ≈ 2778 Wh).
100 MJ (Approx. 27,777.78 Wh)
- This is roughly the energy content of 2.78 liters (about 0.73 gallons) of gasoline, which could power a fuel-efficient car for a short trip (assuming 35 miles per gallon or 5.88 liters per 100 km).
1000 MJ (Approx. 277,778 Wh)
- This amount of energy could power a typical household's electricity usage for about 9.26 days (assuming average household consumption is around 30 kWh/day).

These examples help illustrate how much energy is contained in megajoules and provide a sense of scale for everyday energy consumption.

See below section for step by step unit conversion with formulas and explanations. Please refer to the table below for a list of all the Watt-hours to other unit conversions.

What is megajoules?

A "megajoule" (MJ) is a unit of energy, and it's a big one!

One joule (J) is the amount of energy required to accelerate an object of mass 1 kilogram by a speed of 1 meter per second. It's a small but fundamental unit of measurement.

Now, let's talk about megajoules:

One megajoule (MJ) is equal to one million joules.
In other words, it's one million times more energy than a single joule.
To put this into perspective:
- The average human walking pace releases about 60 MJ of energy per hour.
- The kinetic energy of a car traveling at highway speed (about 30 meters per second) is around 5000-6000 MJ.
- A commercial jet engine produces around 1,000 to 2,000 MJ of thrust per minute.

Megajoules are commonly used in various fields:

Energy production and consumption: megajoules are often used to express the energy output or consumption rate of power plants, vehicles, or industrial processes.
Physics and engineering: megajoules can represent the kinetic energy of moving objects, like spacecraft or large machinery.
Climate science: megajoules are used to quantify the energy associated with greenhouse gas emissions from human activities.

In summary, a megajoule is an enormous unit of energy, representing one million times more power than a single joule. Its usage can be found in various scientific and technical contexts.

What is watt-hours?

A watt-hour is a unit of energy and its units, Wh, are formed with W for watt and h for hour from SI unit system. Its definition, in the context of electricity, is the energy of one watt power flowing for one hour.

Followings equivalent equations are identical but in different units.

1 Wh = 1 Pt = 1 IVt = 3600 J = 2.247 * 10^{22} eV = 8.598*10^5 cal

$P - Power$
$t - Time \text{ (in hours. Multiply by 3600 to convert to seconds)}$
$I - Current$ $V - Volts$
$J - Joules$
$eV - Electronvolt$
$cal - Calories$

Wikipedia page for Kilowatt-hour (watt-hour redirected to kWh) UCI article on Energy Units and Conversions Ian Woofenden's explanation on difference between Watts and Watt-Hours

Complete Megajoules conversion table

Enter # of Megajoules

Convert 1 MJ to other units	Result
Megajoules to Watt-seconds (MJ to Ws)	1000000
Megajoules to Watt-minutes (MJ to Wm)	16666.666666667
Megajoules to Watt-hours (MJ to Wh)	277.77777777778
Megajoules to Milliwatt-hours (MJ to mWh)	277777.77777778
Megajoules to Kilowatt-hours (MJ to kWh)	0.2777777777778
Megajoules to Megawatt-hours (MJ to MWh)	0.0002777777777778
Megajoules to Gigawatt-hours (MJ to GWh)	2.7777777777778e-7
Megajoules to Joules (MJ to J)	1000000
Megajoules to Kilojoules (MJ to kJ)	1000
Megajoules to Gigajoules (MJ to GJ)	0.001
Megajoules to calories (MJ to cal)	239005.73613767
Megajoules to Kilocalories (MJ to kcal)	239.00573613767

Megajoules to Watt-hours conversion