Hectowatt is 100 watt units.
Hectowatts to Milliwatts Converter — hW to mW
Convert Hectowatt (hW) to Milliwatt (mW) using the exact conversion factor (1 hectowatt = 100,000 milliwatt). See the formula, worked examples, and conversion table.
Hectowatts to Milliwatts 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.
Milliwatt is 0.001 watt units.
Result = input x 100 / 0.001.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Hectowatts to Milliwatts
Hectowatt and Milliwatt 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. Specifically: Hectowatt is 100 watt units, and milliwatt is 0.001 watt units.
Formula
milliwatts = hectowatts × 100000
This factor comes from each unit's defined relationship to the category's base unit: 1 hectowatt equals 100 base units, and 1 milliwatt equals 0.001 base units, so dividing one by the other gives the direct hectowatt-to-milliwatt factor of 100000.
Simple example
1 hW × 100000 = 100,000 mW
1 hectowatt = 100,000 milliwatts.
Real-world example
120 hW × 100000 = 12,000,000 mW
120 hectowatts = 12,000,000 milliwatts.
Conversion table
| Hectowatt (hW) | Milliwatt (mW) |
|---|---|
| 1 hW | 100,000 mW |
| 5 hW | 500,000 mW |
| 12 hW | 1,200,000 mW |
| 24 hW | 2,400,000 mW |
| 120 hW | 12,000,000 mW |
| 240 hW | 24,000,000 mW |
Reverse conversion: Milliwatt to Hectowatt
1 mW × 0.00001 = 0.00001 hW
1 milliwatt = 0.00001 hectowatts.
hectowatts = milliwatts × 0.00001
For a page dedicated to this direction, see Milliwatt to Hectowatt.
Understanding the Hectowatt (hW)
Hectowatt is 100 watt units.
Understanding the Milliwatt (mW)
Milliwatt is 0.001 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milliwatts are in 1 hectowatt?
1 hectowatt equals 100,000 milliwatts, using the exact defined conversion factor rather than an estimate.
How do I convert hectowatt to milliwatt?
Multiply the hectowatt value by 100000. The converter above does this instantly to whatever precision you set.
How do I convert milliwatt back to hectowatt?
Use the reverse factor: 1 milliwatt equals 0.00001 hectowatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a hectowatt?
Hectowatt (hW) is a unit of electricity.
What is a milliwatt?
Milliwatt (mW) is a unit of electricity.
Is the hectowatt to milliwatt conversion exact?
Yes. Both hectowatt and milliwatt are defined by fixed standards rather than physical artifacts, so the factor of 100000 used above is exact to as many digits as you choose to display.
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.