Terawatts to Gigawatts Converter
Enter the power in terawatts below to convert it to gigawatts.
Convert Terawatts to Gigawatts
Enter a value in terawatts (TW) to convert to gigawatts (GW).
Terawatt to Gigawatt Conversion Table
Table showing various terawatt measurements converted to gigawatts. Click any preset value or arrow to load it into the converter.
How to Convert Terawatts to Gigawatts
To convert terawatts to gigawatts, multiply the power by the following conversion ratio: 1,000 gigawatts/terawatt.
Since one terawatt is equal to 1,000 gigawatts, you can use this simple formula to convert:
The power in gigawatts is equal to the power in terawatts multiplied by 1,000.
For example, here's how to convert 5 terawatts to gigawatts using the formula above.
How Many Gigawatts Are in a Terawatt?
There are 1,000 gigawatts in a terawatt, which is why we use this value in the formula above.
Our terawatt to gigawatt calculator automatically converts your power measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Terawatts and gigawatts are both units used to measure power. Keep reading to learn more about each unit.
What Is a Terawatt?
A terawatt is a unit of power equal to 1e+12 watts (W), the base unit for power. Equal to 10¹² Watts (1,000 GW). [1]
The terawatt is classified as an International System of Units (SI) unit of power. Terawatts can be abbreviated as TW; for example, 1 terawatt can be written as 1 TW.
In the metric system, "tera" is the standard SI prefix for trillions, or 10¹². This makes the terawatt (TW) a convenient decimal multiple of the watt (W).
In practice, terawatts (TW) are widely used across large-scale industrial, bulk, and macro-level power specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
What Is a Gigawatt?
A gigawatt is a unit of power equal to 1,000,000,000 watts (W), the base unit for power. Equal to 1,000,000,000 Watts (1,000 MW). [2]
The gigawatt is classified as an International System of Units (SI) unit of power. Gigawatts can be abbreviated as GW; for example, 1 gigawatt can be written as 1 GW.
In the metric system, "giga" is the standard SI prefix for billions, or 10⁹. This makes the gigawatt (GW) a convenient decimal multiple of the watt (W).
In practice, gigawatts (GW) are widely used across large-scale industrial, bulk, and macro-level power specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting power between terawatts (TW) and gigawatts (GW), keep full floating-point precision (1 TW = 1,000 GW; 1 GW = 0.001 TW) during intermediate calculations and round only the final gigawatt figure to match your instrument tolerance.
More Terawatt & Gigawatt Conversions
Need to calculate in the opposite direction? Use our gigawatts to terawatts calculator to switch your starting unit immediately. You can also explore related tools such as converting gigawatts to terawatts, converting watts to horsepower (hp), or converting horsepower (hp) to watts.
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Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Power & Radiant Flux))·Power Metrology Standard — Terawatts (TW) to Gigawatts (GW)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Watt (W))·Unit Specifications: Terawatt (TW) & Gigawatt (GW)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Power)·Conversion Factors & Mathematical Basis (TW to GW)