Watt to Joule/Second Converter

Power Converter

22 units available

Decimals:

From

To

1

1 W = 1 J/s

Formula:

J/s = W × 1

With your value: 1 W = 1 J/s

How big is that?

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

Your value1.00 W

LED bulb (9.0× your value)9.00 W

Laptop (65× your value)65.0 W

Microwave oven (1.0e+3× your value)1.00e+3 W

Electric kettle (3.0e+3× your value)3.00e+3 W

Family car engine (9.0e+4× your value)9.00e+4 W

Other Watt to Joule/Second conversions

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

Watt to Joule/Second Conversion Table

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

Joule/Second to Watt Conversion Table

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

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.

Watt (W)

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

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

How to Convert Watt to Joule/Second

To convert from Watt (W) to Joule/Second (J/s), multiply the value by 1.

Formula: J/s = W × 1

Reverse: W = J/s × 1

Step-by-Step Example

Start with your value in Watt. For example: 5 W
Multiply by the conversion factor: 5 x 1
The result is: 5 J/s

About Watt

The watt (W) is a unit of power. One watt 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 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.

Frequently Asked Questions

How many Joule/Second are in 1 Watt?

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

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

The formula to convert Watt to Joule/Second is: J/s = W × 1. For example, to convert 10 Watt to Joule/Second, you would multiply 10 by 1.

What is a Watt?