Gigawatt is 1000000000 watt units.
Gigawatts to Terawatts Converter — GW to TW
Convert Gigawatt (GW) to Terawatt (TW) using the exact conversion factor (1 gigawatt = 0.001 terawatt). See the formula, worked examples, and conversion table.
Gigawatts to Terawatts 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.
Terawatt is 1000000000000 watt units.
Result = input x 1e+9 / 1e+12.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Gigawatts to Terawatts
Gigawatt and Terawatt 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 terawatt is 1000000000000 watt units.
Formula
terawatts = gigawatts × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 gigawatt equals 1000000000 base units, and 1 terawatt equals 1e+12 base units, so dividing one by the other gives the direct gigawatt-to-terawatt factor of 0.001.
Simple example
1 GW × 0.001 = 0.001 TW
1 gigawatt = 0.001 terawatts.
Real-world example
120 GW × 0.001 = 0.12 TW
120 gigawatts = 0.12 terawatts.
Conversion table
| Gigawatt (GW) | Terawatt (TW) |
|---|---|
| 1 GW | 0.001 TW |
| 5 GW | 0.005 TW |
| 12 GW | 0.012 TW |
| 24 GW | 0.024 TW |
| 120 GW | 0.12 TW |
| 240 GW | 0.24 TW |
Reverse conversion: Terawatt to Gigawatt
0.001 TW × 1000 = 1 GW
0.001 terawatts = 1 gigawatt.
gigawatts = terawatts × 1000
For a page dedicated to this direction, see Terawatt to Gigawatt.
Understanding the Gigawatt (GW)
Gigawatt is 1000000000 watt units.
Understanding the Terawatt (TW)
Terawatt is 1000000000000 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many terawatts are in 1 gigawatt?
1 gigawatt equals 0.001 terawatts, using the exact defined conversion factor rather than an estimate.
How do I convert gigawatt to terawatt?
Multiply the gigawatt value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert terawatt back to gigawatt?
Use the reverse factor: 1 terawatt equals 1,000 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 terawatt?
Terawatt (TW) is a unit of electricity.
Is the gigawatt to terawatt conversion exact?
Yes. Both gigawatt and terawatt are defined by fixed standards rather than physical artifacts, so the factor of 0.001 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.