Joules to Watt-Seconds Converter

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


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Result in Watt-Seconds:

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1 J = 1 Ws

Do you want to convert watt-seconds to joules?

How to Convert Joules to Watt-Seconds

To convert a measurement in joules to a measurement in watt-seconds, divide the energy by the following conversion ratio: 1 joules/watt-second.

Since one watt-second is equal to 1 joule, you can use this simple formula to convert:

watt-seconds = joules ÷ 1

The energy in watt-seconds is equal to the energy in joules divided by 1.

For example, here's how to convert 5 joules to watt-seconds using the formula above.
watt-seconds = (5 J ÷ 1) = 5 Ws

How Many Watt-Seconds Are in a Joule?

There are 1 watt-second in a joule, which is why we use this value in the formula above.

1 J = 1 Ws

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

What Is a Joule?

The joule is the energy equal to the force on an object of one newton at a distance of one meter.[1] One joule is equal to the heat energy dissipated by the current of one ampere through one ohm of resistance for one second.

One joule is also equal to the energy needed to move an electric charge of one coulomb through a potential difference of one volt. In addition, one joule is also equal to the one watt-second.

The joule is the SI derived unit for energy in the metric system. Joules can be abbreviated as J; for example, 1 joule can be written as 1 J.

Learn more about joules.

What Is a Watt-Second?

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]

Learn more about watt-seconds.

Joule to Watt-Second Conversion Table

Table showing various joule measurements converted to watt-seconds.
Joules Watt-seconds
1 J 1 Ws
2 J 2 Ws
3 J 3 Ws
4 J 4 Ws
5 J 5 Ws
6 J 6 Ws
7 J 7 Ws
8 J 8 Ws
9 J 9 Ws
10 J 10 Ws
11 J 11 Ws
12 J 12 Ws
13 J 13 Ws
14 J 14 Ws
15 J 15 Ws
16 J 16 Ws
17 J 17 Ws
18 J 18 Ws
19 J 19 Ws
20 J 20 Ws
21 J 21 Ws
22 J 22 Ws
23 J 23 Ws
24 J 24 Ws
25 J 25 Ws
26 J 26 Ws
27 J 27 Ws
28 J 28 Ws
29 J 29 Ws
30 J 30 Ws
31 J 31 Ws
32 J 32 Ws
33 J 33 Ws
34 J 34 Ws
35 J 35 Ws
36 J 36 Ws
37 J 37 Ws
38 J 38 Ws
39 J 39 Ws
40 J 40 Ws


  1. International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019,

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