# Watt second conversions

energy conversions » watt second conversionsThe online converter calculator on this page allows you to select the energy measurement unit you want to convert to starting from watt seconds (Ws). To make a conversion starting from a unit of energy other than watt second, simply click on the "Reset" button.

## What is watt second?

### Definition:

The watt second (or watt-second) is a derived unit of energy equal to one joule (1 Ws = 1 J), the SI derived unit of energy. It is also equal to 0.001 kilojoules (kJ), or 2.7777778x10-4 watt hours (Wh), or 2.7777778x10-7 kilowatt hours (kWh), or 2.7777778x10-10 megawatt hours (MWh) or 2.7777778x10-13 gigawatt hours (GWh).

The watt second is the energy required to produce one watt of power for one second. The watt (W) is a derived unit of power in the SI while the second (s) is an SI unit of time.

*Note:*

The SI is an abbreviation for the International System of Units.

### Symbol:

Ws

### Plural:

watt seconds

### Also known as:

watt-second (plural: watt-seconds)

Below you can find a comprehensive list with conversions from watt seconds to other (metric, imperial, or customary) energy measurement units.