Megajoules to Watt-seconds Conversion

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

Results in Watt-seconds:
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1 MJ = 1,000,000 Ws

How to Convert Megajoules to Watt-seconds

To convert a megajoule measurement to a watt-second measurement, multiply the energy by the conversion ratio.

Since one megajoule is equal to 1,000,000 watt-seconds, you can use this simple formula to convert:

watt-seconds = megajoules × 1,000,000

The energy in watt-seconds is equal to the megajoules multiplied by 1,000,000.

For example, here's how to convert 5 megajoules to watt-seconds using the formula above.
5 MJ = (5 × 1,000,000) = 5,000,000 Ws

How Many Watt-seconds Are in a Megajoule?

There are 1,000,000 watt-seconds in a megajoule, which is why we use this value in the formula above.

1 MJ = 1,000,000 Ws

Megajoules and watt-seconds are both units used to measure energy. Keep reading to learn more about each unit of measure.


One megajoule is equal to 1,000,000 joules, which are 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 106. Megajoules can be abbreviated as MJ; for example, 1 megajoule can be written as 1 MJ.


The watt-second is a measure of electrical energy equal to one watt of power over a one second period. One watt-second is equal to 1/3,600 of a watt-hour or one joule.

Watt-seconds are usually abbreviated as Ws, although the formally adopted expression is W·s. The abbreviation W s is also sometimes used. For example, 1 watt-second can be written as 1 Ws, 1 W·s, or 1 W s.

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.[1]

Megajoule to Watt-second Conversion Table

Megajoule measurements converted to watt-seconds
Megajoules Watt-seconds
0.000001 MJ 1 Ws
0.000002 MJ 2 Ws
0.000003 MJ 3 Ws
0.000004 MJ 4 Ws
0.000005 MJ 5 Ws
0.000006 MJ 6 Ws
0.000007 MJ 7 Ws
0.000008 MJ 8 Ws
0.000009 MJ 9 Ws
0.0000001 MJ 0.1 Ws
0.000001 MJ 1 Ws
0.00001 MJ 10 Ws
0.0001 MJ 100 Ws
0.001 MJ 1,000 Ws
0.01 MJ 10,000 Ws
0.1 MJ 100,000 Ws
1 MJ 1,000,000 Ws


  1. Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019,

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