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
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
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.
Power units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Gigawatts to Terawatts
Gigawatt and Terawatt both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. 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
100 GW × 0.001 = 0.1 TW
100 gigawatts = 0.1 terawatts.
Conversion table
| Gigawatt (GW) | Terawatt (TW) |
|---|---|
| 1 GW | 0.001 TW |
| 10 GW | 0.01 TW |
| 50 GW | 0.05 TW |
| 100 GW | 0.1 TW |
| 500 GW | 0.5 TW |
| 1,000 GW | 1 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 engineering.
What is a terawatt?
Terawatt (TW) is a unit of engineering.
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.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.