# Megajoules to Watt-Hours Converter

Enter the energy in megajoules below to get the value converted to watt-hours.

Results in Watt-Hours: 1 MJ = 277.777778 Wh

Do you want to convert watt-hours to megajoules?

## How to Convert Megajoules to Watt-Hours

To convert a measurement in megajoules to a measurement in watt-hours, multiply the energy by the following conversion ratio: 277.777778 watt-hours/megajoule.

Since one megajoule is equal to 277.777778 watt-hours, you can use this simple formula to convert:

watt-hours = megajoules × 277.777778

The energy in watt-hours is equal to the energy in megajoules multiplied by 277.777778.

For example, here's how to convert 5 megajoules to watt-hours using the formula above.
watt-hours = (5 MJ × 277.777778) = 1,388.888889 Wh

### How Many Watt-Hours Are in a Megajoule?

There are 277.777778 watt-hours in a megajoule, which is why we use this value in the formula above.

1 MJ = 277.777778 Wh

## What is a Megajoule?

One megajoule is equal to 1,000,000 joules, which is the energy equal to the force on an object of one newton at a distance of one meter.

The megajoule is a multiple of the joule, which is the SI derived unit for energy. In the metric system, "mega" is the prefix for millions, or 106. Megajoules can be abbreviated as MJ; for example, 1 megajoule can be written as 1 MJ.

## What is a Watt-Hour?

The watt-hour is a measure of electrical energy equal to one watt of power over a one hour period.

Watt-hours are usually abbreviated as Wh, although the formally adopted expression is W·h. The abbreviation W h is also sometimes used. For example, 1 watt-hour can be written as 1 Wh, 1 W·h, or 1 W h.

In formal expressions, the centered dot (·) or space is used to separate units used to indicate multiplication in an expression and to avoid conflicting prefixes being misinterpreted as a unit symbol.

## Megajoule to Watt-Hour Conversion Table

Table showing various megajoule measurements converted to watt-hours.
Megajoules Watt-hours
1 MJ 277.78 Wh
2 MJ 555.56 Wh
3 MJ 833.33 Wh
4 MJ 1,111 Wh
5 MJ 1,389 Wh
6 MJ 1,667 Wh
7 MJ 1,944 Wh
8 MJ 2,222 Wh
9 MJ 2,500 Wh
10 MJ 2,778 Wh
11 MJ 3,056 Wh
12 MJ 3,333 Wh
13 MJ 3,611 Wh
14 MJ 3,889 Wh
15 MJ 4,167 Wh
16 MJ 4,444 Wh
17 MJ 4,722 Wh
18 MJ 5,000 Wh
19 MJ 5,278 Wh
20 MJ 5,556 Wh
21 MJ 5,833 Wh
22 MJ 6,111 Wh
23 MJ 6,389 Wh
24 MJ 6,667 Wh
25 MJ 6,944 Wh
26 MJ 7,222 Wh
27 MJ 7,500 Wh
28 MJ 7,778 Wh
29 MJ 8,056 Wh
30 MJ 8,333 Wh
31 MJ 8,611 Wh
32 MJ 8,889 Wh
33 MJ 9,167 Wh
34 MJ 9,444 Wh
35 MJ 9,722 Wh
36 MJ 10,000 Wh
37 MJ 10,278 Wh
38 MJ 10,556 Wh
39 MJ 10,833 Wh
40 MJ 11,111 Wh

## References

1. Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf