Deciwatt is 0.1 watt units.
Deciwatts to Watts Converter — dW to W
Convert Deciwatt (dW) to Watt (W) using the exact conversion factor (1 deciwatt = 0.1 watt). See the formula, worked examples, conversion table, history, and common uses.
Deciwatts to Watts 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.
The watt is one joule per second.
Result = input x 0.1 / 1.
Power uses the watt as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Deciwatts to Watts
Deciwatt and Watt 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. Specifically: Deciwatt is 0.1 watt units, and the watt is one joule per second.
Formula
watts = deciwatts × 0.1
This factor comes from each unit's defined relationship to the category's base unit: 1 deciwatt equals 0.1 base units, and 1 watt equals 1 base unit, so dividing one by the other gives the direct deciwatt-to-watt factor of 0.1.
Simple example
1 dW × 0.1 = 0.1 W
1 deciwatt = 0.1 watts.
Real-world example
100 dW × 0.1 = 10 W
100 deciwatts = 10 watts.
Conversion table
| Deciwatt (dW) | Watt (W) |
|---|---|
| 1 dW | 0.1 W |
| 10 dW | 1 W |
| 100 dW | 10 W |
| 500 dW | 50 W |
| 1,000 dW | 100 W |
| 5,000 dW | 500 W |
Reverse conversion: Watt to Deciwatt
0.1 W × 10 = 1 dW
0.1 watts = 1 deciwatt.
deciwatts = watts × 10
For a page dedicated to this direction, see Watt to Deciwatt.
Understanding the Deciwatt (dW)
Deciwatt is 0.1 watt units.
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.
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 watts are in 1 deciwatt?
1 deciwatt equals 0.1 watts, using the exact defined conversion factor rather than an estimate.
How do I convert deciwatt to watt?
Multiply the deciwatt value by 0.1. The converter above does this instantly to whatever precision you set.
How do I convert watt back to deciwatt?
Use the reverse factor: 1 watt equals 10 deciwatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a deciwatt?
Deciwatt (dW) is a unit of power.
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.
Is the deciwatt to watt conversion exact?
Yes. Both deciwatt and watt are defined by fixed standards rather than physical artifacts, so the factor of 0.1 used above is exact to as many digits as you choose to display.