Watt is one joule per second.
Watts to Hectowatts Converter — W to hW
Convert Watt (W) to Hectowatt (hW) using the exact conversion factor (1 watt = 0.01 hectowatt). See the formula, worked examples, conversion table, history, and common uses.
Watts to Hectowatts converter
Converter
Electricity Converter
Convert electrical units by family and calculate voltage, current, resistance, power, and energy with context values.
Context values
Some unit families need one extra value for a physically accurate result.
Hectowatt is 100 watt units.
Result = input x 1 / 100.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Watts to Hectowatts
Watt and Hectowatt both belong to the electricity family — voltage, current, resistance, power, or energy — units that show up constantly when working across the different standards used by household wiring (120V/240V depending on region), automotive electrical systems (12V/24V), and electronics design. Watt is most often used for electrical appliance power ratings worldwide.
Formula
hectowatts = watts × 0.01
This factor comes from each unit's defined relationship to the category's base unit: 1 watt equals 1 base unit, and 1 hectowatt equals 100 base units, so dividing one by the other gives the direct watt-to-hectowatt factor of 0.01.
Simple example
1 W × 0.01 = 0.01 hW
1 watt = 0.01 hectowatts.
Real-world example
120 W × 0.01 = 1.2 hW
120 watts = 1.2 hectowatts.
Conversion table
| Watt (W) | Hectowatt (hW) |
|---|---|
| 1 W | 0.01 hW |
| 5 W | 0.05 hW |
| 12 W | 0.12 hW |
| 24 W | 0.24 hW |
| 120 W | 1.2 hW |
| 240 W | 2.4 hW |
Reverse conversion: Hectowatt to Watt
0.01 hW × 100 = 1 W
0.01 hectowatts = 1 watt.
watts = hectowatts × 100
For a page dedicated to this direction, see Hectowatt 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 Hectowatt (hW)
Hectowatt is 100 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 hectowatts are in 1 watt?
1 watt equals 0.01 hectowatts, using the exact defined conversion factor rather than an estimate.
How do I convert watt to hectowatt?
Multiply the watt value by 0.01. The converter above does this instantly to whatever precision you set.
How do I convert hectowatt back to watt?
Use the reverse factor: 1 hectowatt equals 100 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 hectowatt?
Hectowatt (hW) is a unit of electricity.
Is the watt to hectowatt conversion exact?
Yes. Both watt and hectowatt are defined by fixed standards rather than physical artifacts, so the factor of 0.01 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
What's the difference between voltage, current, and resistance?
Voltage (volts) is the electrical potential difference driving current through a circuit. Current (amperes) is the rate of flow of electric charge. Resistance (ohms) is how much a component opposes that flow. They're related by Ohm's law (V = I × R), but they are distinct physical quantities, and this page converts between units of just one of them.