Joule/Second to Kilowatt Converter

Power Converter

22 units available

Decimals:

From

To

0.001

1 J/s = 0.001 kW

Formula:

kW = J/s × 0.001

With your value: 1 J/s = 0.001 kW

How big is that?

Everyday references on a logarithmic scale, all expressed in joule/second so you can sanity-check the result.

Your value1.00 J/s

LED bulb (9.0× your value)9.00 J/s

Laptop (65× your value)65.0 J/s

Microwave oven (1.0e+3× your value)1.00e+3 J/s

Electric kettle (3.0e+3× your value)3.00e+3 J/s

Family car engine (9.0e+4× your value)9.00e+4 J/s

Other Joule/Second to Kilowatt conversions

2 J/s to kW 3 J/s to kW 4 J/s to kW 5 J/s to kW 6 J/s to kW 7 J/s to kW 8 J/s to kW

Joule/Second to Kilowatt Conversion Table

Joule/Second (J/s)	Kilowatt (kW)
0.5	0.0005
1	0.001
2	0.002
5	0.005
10	0.01
15	0.015
20	0.02
25	0.025
50	0.05
100	0.1
250	0.25
500	0.5
1000	1

Kilowatt to Joule/Second Conversion Table

Kilowatt (kW)	Joule/Second (J/s)
0.5	500
1	1,000
2	2,000
5	5,000
10	10,000
15	15,000
20	20,000
25	25,000
50	50,000
100	100,000
250	250,000
500	500,000
1000	1,000,000

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Joule/Second (J/s)

Power

Exact conversion

Derived from the watt (1 W = 1 J/s).

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Kilowatt (kW)

Power

Exact conversion

Derived from the watt (1 W = 1 J/s).

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Joule/Second to Kilowatt

To convert from Joule/Second (J/s) to Kilowatt (kW), multiply the value by 0.001.

Formula: kW = J/s × 0.001

Reverse: J/s = kW × 1,000

Step-by-Step Example

Start with your value in Joule/Second. For example: 5 J/s
Multiply by the conversion factor: 5 x 0.001
The result is: 0.005 kW

About Joule/Second

The joule/second (J/s) is a unit of power. One joule/second equals 1 watt. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: power calculations, engineering and science, education.

About Kilowatt

The kilowatt (kW) is a unit of power. One kilowatt equals 1000 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: power calculations, engineering and science, education.

Frequently Asked Questions

How many Kilowatt are in 1 Joule/Second?

There are exactly 0.001 Kilowatt in 1 Joule/Second. This means the conversion factor from Joule/Second to Kilowatt is 0.001.

What is the formula to convert Joule/Second to Kilowatt?

The formula to convert Joule/Second to Kilowatt is: kW = J/s × 0.001. For example, to convert 10 Joule/Second to Kilowatt, you would multiply 10 by 0.001.

What is a Joule/Second?