Convert Watt-seconds to Joules

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

Results in Joules:
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1 Ws = 1 J

How to Convert Watt-seconds to Joules

To convert a watt-second measurement to a joule measurement, multiply the energy by the conversion ratio. One watt-second is equal to 1 joule, so use this simple formula to convert:

joules = watt-seconds × 1

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

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

Watt-seconds and joules 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 can be abbreviated as Ws, for example 1 watt-second can be written as 1 Ws.


The joule is the energy equal to the force on an object of one newton at a distance of one meter. 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.

Watt-second Measurements and Equivalent Joule Conversions

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

More Watt-second Energy Conversions

Convert to Kilojoules
1 Ws is equal to 0.001 kilojoules
Convert to Megajoules
1 Ws is equal to 1.0E-6 megajoules
Convert to Gigajoules
1 Ws is equal to 1.0E-9 gigajoules
Convert to Calories
1 Ws is equal to 0.239006 calories
Convert to Kilocalories
1 Ws is equal to 0.000239 kilocalories
Convert to Megacalories
1 Ws is equal to 2.3901E-7 megacalories
Watts x Time
Convert to Watt-hours
1 Ws is equal to 0.000278 watt-hours
Convert to Kilowatt-hours
1 Ws is equal to 2.7778E-7 kilowatt-hours
Convert to Megawatt-hours
1 Ws is equal to 2.7778E-10 megawatt-hours
Thermal Units
Convert to British Thermal Units
1 Ws is equal to 0.000948 british thermal units
Convert to Million BTU
1 Ws is equal to 9.4782E-10 million BTU
Convert to Therms
1 Ws is equal to 9.4782E-9 therms
Convert to Quads
1 Ws is equal to 9.4782E-19 quads
Convert to Electronvolts
1 Ws is equal to 6,241,500,000,000,000,000 electronvolts
Convert to Kiloelectronvolts
1 Ws is equal to 6,241,500,000,000,000 kiloelectronvolts
Convert to Megaelectronvolts
1 Ws is equal to 6,241,509,343,260.2 megaelectronvolts