The watt is one joule per second.
Watts to Nanowatts Converter — W to nW
Convert Watt (W) to Nanowatt (nW) using the exact conversion factor (1 watt = 1,000,000,000 nanowatt). See the formula, worked examples, conversion table, history, and common uses.
Watts to Nanowatts converter
Converter
Power Converter
Convert watts, horsepower, refrigeration tons, BTU per hour, and engineering power units.
Context values
Some unit families need one extra value for a physically accurate result.
Nanowatt is 1e-9 watt units.
Result = input x 1 / 1e-9.
Power uses the watt as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Watts to Nanowatts
Watt and Nanowatt both describe power output, and the conversion is a routine part of comparing an engine or motor's spec sheet across countries that use different power units. Watt is most often used for electrical appliance power ratings worldwide.
Formula
nanowatts = watts × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 watt equals 1 base unit, and 1 nanowatt equals 1e-9 base units, so dividing one by the other gives the direct watt-to-nanowatt factor of 1000000000.
Simple example
1 W × 1000000000 = 1,000,000,000 nW
1 watt = 1,000,000,000 nanowatts.
Real-world example
100 W × 1000000000 = 100,000,000,000 nW
100 watts = 100,000,000,000 nanowatts.
Conversion table
| Watt (W) | Nanowatt (nW) |
|---|---|
| 1 W | 1,000,000,000 nW |
| 10 W | 10,000,000,000 nW |
| 100 W | 100,000,000,000 nW |
| 500 W | 500,000,000,000 nW |
| 1,000 W | 1,000,000,000,000 nW |
| 5,000 W | 5e+12 nW |
Reverse conversion: Nanowatt to Watt
1 nW × 1e-9 = 1e-9 W
1 nanowatt = 1e-9 watts.
watts = nanowatts × 1e-9
For a page dedicated to this direction, see Nanowatt to Watt.
Understanding the Watt
Watt (W) measures power. The watt is the SI derived unit of power: one joule of energy per second. It is classified as a SI derived unit.
Where it's used: Standard scientific and everyday power unit worldwide
Uses of the Watt today
- Electrical appliance power ratings worldwide
- Light bulb brightness-equivalent labeling
- Engine and motor power specifications (alongside horsepower)
History of the Watt
The watt is named after James Watt, whose improvements to the steam engine in the late 18th century were commercially pivotal; ironically, Watt himself used horsepower (a unit he helped popularize) to market his engines. The watt was formally adopted as a unit at the 1889 General Conference on Weights and Measures and became the SI derived unit of power in the 20th century.
Historical origin. Watt was not the invention of a single named person; it developed through the process described above.
Understanding the Nanowatt (nW)
Nanowatt is 1e-9 watt units.
Watt — sources
- BIPM SI Brochure — Coherent derived units — Defines the watt as the SI unit of power.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanowatts are in 1 watt?
1 watt equals 1,000,000,000 nanowatts, using the exact defined conversion factor rather than an estimate.
How do I convert watt to nanowatt?
Multiply the watt value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert nanowatt back to watt?
Use the reverse factor: 1 nanowatt equals 1e-9 watts. You can also use the swap control in the converter above to flip the direction instantly.
What is a watt?
Watt (W) measures power. The watt is the SI derived unit of power: one joule of energy per second. It is classified as a SI derived unit.
What is a nanowatt?
Nanowatt (nW) is a unit of power.
Is the watt to nanowatt conversion exact?
Yes. Both watt and nanowatt are defined by fixed standards rather than physical artifacts, so the factor of 1000000000 used above is exact to as many digits as you choose to display.
Where is the watt still used today?
Standard scientific and everyday power unit worldwide