Gigawatt is 1000000000 watt units.
Gigawatts to Milliwatts Converter — GW to mW
Convert Gigawatt (GW) to Milliwatt (mW) using the exact conversion factor (1 gigawatt = 1e+12 milliwatt). See the formula, worked examples, and conversion table.
Gigawatts 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 1e+9 / 0.001.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Gigawatts to Milliwatts
Gigawatt 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: Gigawatt is 1000000000 watt units, and milliwatt is 0.001 watt units.
Formula
milliwatts = gigawatts × 1e+12
This factor comes from each unit's defined relationship to the category's base unit: 1 gigawatt equals 1000000000 base units, and 1 milliwatt equals 0.001 base units, so dividing one by the other gives the direct gigawatt-to-milliwatt factor of 1e+12.
Simple example
1 GW × 1e+12 = 1e+12 mW
1 gigawatt = 1e+12 milliwatts.
Real-world example
120 GW × 1e+12 = 1.2e+14 mW
120 gigawatts = 1.2e+14 milliwatts.
Conversion table
| Gigawatt (GW) | Milliwatt (mW) |
|---|---|
| 1 GW | 1e+12 mW |
| 5 GW | 5e+12 mW |
| 12 GW | 1.2e+13 mW |
| 24 GW | 2.4e+13 mW |
| 120 GW | 1.2e+14 mW |
| 240 GW | 2.4e+14 mW |
Reverse conversion: Milliwatt to Gigawatt
1e+12 mW × 1e-12 = 1 GW
1e+12 milliwatts = 1 gigawatt.
gigawatts = milliwatts × 1e-12
For a page dedicated to this direction, see Milliwatt to Gigawatt.
Understanding the Gigawatt (GW)
Gigawatt is 1000000000 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 gigawatt?
1 gigawatt equals 1e+12 milliwatts, using the exact defined conversion factor rather than an estimate.
How do I convert gigawatt to milliwatt?
Multiply the gigawatt value by 1e+12. The converter above does this instantly to whatever precision you set.
How do I convert milliwatt back to gigawatt?
Use the reverse factor: 1 milliwatt equals 1e-12 gigawatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a gigawatt?
Gigawatt (GW) is a unit of electricity.
What is a milliwatt?
Milliwatt (mW) is a unit of electricity.
Is the gigawatt to milliwatt conversion exact?
Yes. Both gigawatt and milliwatt are defined by fixed standards rather than physical artifacts, so the factor of 1e+12 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.