Joule/Second to Watt Converter
Convert Joule/Second (J/s) to Watt (W) instantly. 1 J/s = 1 W.
Power Converter
22 units available
1 J/s = 1 W
Formula:
W = J/s × 1With your value: 1 J/s = 1 W
How big is that?
Everyday references on a logarithmic scale, all expressed in joule/second so you can sanity-check the result.
Other Joule/Second to Watt conversions
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 |
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 |
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
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
Watt (W)
Power
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 Watt
To convert from Joule/Second (J/s) to Watt (W), multiply the value by 1.
Formula: W = J/s × 1
Reverse: J/s = W × 1
Step-by-Step Example
- Start with your value in Joule/Second. For example: 5 J/s
- Multiply by the conversion factor: 5 x 1
- The result is: 5 W
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 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.
Frequently Asked Questions
How many Watt are in 1 Joule/Second?
There are exactly 1 Watt in 1 Joule/Second. This means the conversion factor from Joule/Second to Watt is 1.
What is the formula to convert Joule/Second to Watt?
The formula to convert Joule/Second to Watt is: W = J/s × 1. For example, to convert 10 Joule/Second to Watt, you would multiply 10 by 1.
What is a 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.
What is a 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.
What are the common uses of Joule/Second?
The Joule/Second is commonly used in power calculations, engineering and science, education.
Related Power Conversions
Cite this page
UnitConvertLab. (2026). Joule/Second to Watt converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/joule_per_second-to-watt