Watt-seconds to Megajoules Conversion

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

Results in Megajoules:
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1 Ws = 1.0E-6 MJ
Hint: use a scientific notation calculator to convert E notation to decimal

How to Convert Watt-seconds to Megajoules

To convert a watt-second measurement to a megajoule measurement, divide 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:

megajoules = watt-seconds ÷ 1,000,000

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

For example, here's how to convert 500,000 watt-seconds to megajoules using the formula above.
500,000 Ws = (500,000 ÷ 1,000,000) = 0.5 MJ

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


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]


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.

Watt-second to Megajoule Conversion Table

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


  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

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