Watt Seconds To Kilojoules Conversion


1 Ws = 0.001 kJ

Want to convert from kilojoules to watt seconds instead?

Disclaimer: We've spent hundreds of hours building and testing our calculators and conversion tools. However, we cannot be held liable for any damages or losses (monetary or otherwise) arising out of or in connection with their use. Full disclaimer.

How to convert watt seconds to kilojoules (Ws to kJ)

The formula for converting watt seconds to kilojoules is: kJ = Ws × 0.001. To calculate the watt second value in kilojoules first substitute the watt second value into the preceding formula, and then perform the calculation. If we wanted to calculate 1 watt second in kilojoules we follow these steps:

kJ = Ws × 0.001

kJ = 1 × 0.001

kJ = 0.001

In other words, 1 watt second is equal to 0.001 kilojoules.

Example Conversion

Let's take a look at an example. The step-by-step process to convert 6 watt seconds to kilojoules is:

  1. Understand the conversion formula: kJ = Ws × 0.001
  2. Substitute the required value. In this case we substitute 6 for Ws so the formula becomes: kJ = 6 × 0.001
  3. Calculate the result using the provided values. In our example the result is: 6 × 0.001 = 0.006 kJ

In summary, 6 watt seconds is equal to 0.006 kilojoules.

Converting kilojoules to watt seconds

In order to convert the other way around i.e. kilojoules to watt seconds, you would use the following formula: Ws = kJ × 1000. To convert kilojoules to watt seconds first substitute the kilojoule value into the above formula, and then execute the calculation. If we wanted to calculate 1 kilojoule in watt seconds we follow these steps:

Ws = kJ × 1000

Ws = 1 × 1000

Ws = 1000

Or in other words, 1 kilojoule is equal to 1000 watt seconds.

Conversion Unit Definitions

What is a Watt Second?

A watt-second (Ws), also known as a joule (J), is a unit of energy in the International System of Units (SI). It represents one watt of power expended for one second. Mathematically, it can be defined as: 1 watt-second (Ws) = 1 watt (W) × 1second (s) = 1 joule (J).
Watt-seconds are used to measure the energy consumed or produced by electronic devices or electrical systems in a very short amount of time. For example, the energy released by a camera flash, the energy stored in capacitors, or the energy consumed by a small electronic circuit during its operation can be measured in watt-seconds.
In practical terms, a watt-second is a relatively small unit of energy. To provide some context, 1 watt-second is equivalent to the energy required to power a 1-watt device for 1 second.

What is a Kilojoule?

A kilojoule (kJ) is a metric unit of energy in the International System of Units (SI). One kilojoule is equal to 1,000 joules. It is commonly used in nutrition and chemistry to express the energy content of foods and the energy released or absorbed in chemical reactions.
In the context of nutrition, kilojoules are often used to measure the energy value of foods and beverages. The energy we obtain from the food we eat is usually expressed in kilojoules or kilocalories (commonly referred to as calories). One kilocalorie is approximately equal to 4.184 kilojoules.
In chemical reactions, especially in the field of thermodynamics, energy changes are frequently measured in joules or kilojoules. The prefix "kilo-" denotes a factor of 1,000, so 1 kilojoule is equivalent to 1,000 joules.

Watt Seconds To Kilojoules Conversion Table

Below is a lookup table showing common watt seconds to kilojoules conversion values.

Watt Second (Ws)Kilojoule (kJ)
1 Ws0.001 kJ
2 Ws0.002 kJ
3 Ws0.003 kJ
4 Ws0.004 kJ
5 Ws0.005 kJ
6 Ws0.006 kJ
7 Ws0.007 kJ
8 Ws0.008 kJ
9 Ws0.009 kJ
10 Ws0.01 kJ
11 Ws0.011 kJ
12 Ws0.012 kJ
13 Ws0.013 kJ

Other Common Watt Second Conversions

Below is a table of common conversions from watt seconds to other energy units.

1 watt second in joules1 J
1 watt second in calories0.2390057361 cal
1 watt second in watt hours0.0002777778 Wh
1 watt second in kilowatt hours0.0000002777778 kWh
1 watt second in electron volts6241509647120400000 eV