Gigawatts to Milliwatts Converter
Enter the power in gigawatts below to convert it to milliwatts.
Convert Gigawatts to Milliwatts
Enter a value in gigawatts (GW) to convert to milliwatts (mW).
Gigawatt to Milliwatt Conversion Table
Table showing various gigawatt measurements converted to milliwatts. Click any preset value or arrow to load it into the converter.
| Gigawatts (GW) | Milliwatts (mW) |
|---|---|
| 0.0000001 GW | 100,000 mW |
| 0.0000002 GW | 200,000 mW |
| 0.0000003 GW | 300,000 mW |
| 0.0000004 GW | 400,000 mW |
| 0.0000005 GW | 500,000 mW |
| 0.0000006 GW | 600,000 mW |
| 0.0000007 GW | 700,000 mW |
| 0.0000008 GW | 800,000 mW |
| 0.0000009 GW | 900,000 mW |
| 0.00000001 GW | 10,000 mW |
How to Convert Gigawatts to Milliwatts
To convert gigawatts to milliwatts, multiply the power by the following conversion ratio: 1e+12 milliwatts/gigawatt.
Since one gigawatt is equal to 1e+12 milliwatts, you can use this simple formula to convert:
The power in milliwatts is equal to the power in gigawatts multiplied by 1e+12.
For example, here's how to convert 5 gigawatts to milliwatts using the formula above.
How Many Milliwatts Are in a Gigawatt?
There are 1e+12 milliwatts in a gigawatt, which is why we use this value in the formula above.
Our gigawatt to milliwatt calculator automatically converts your power measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Gigawatts and milliwatts are both units used to measure power. Keep reading to learn more about each unit.
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). [1]
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.
What Is a Milliwatt?
A milliwatt is a unit of power equal to 1/1,000 of a watt (0.001 W). One-thousandth of a Watt. [2]
The milliwatt is classified as a metric and SI-compatible unit of power. Milliwatts can be abbreviated as mW; for example, 1 milliwatt can be written as 1 mW.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the milliwatt (mW) a convenient decimal multiple of the watt (W).
In practice, milliwatts (mW) are widely used across fine-tolerance laboratory, analytical, and micro-scale power measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting power between gigawatts (GW) and milliwatts (mW), keep full floating-point precision (1 GW = 1e+12 mW; 1 mW = 1e-12 GW) during intermediate calculations and round only the final milliwatt figure to match your instrument tolerance.
More Gigawatt & Milliwatt Conversions
Need to calculate in the opposite direction? Use our milliwatts to gigawatts calculator to switch your starting unit immediately. You can also explore related tools such as converting milliwatts to gigawatts, converting watts to horsepower (hp), or converting horsepower (hp) to watts.
Convert from Gigawatts
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Power & Radiant Flux))·Power Metrology Standard — Gigawatts (GW) to Milliwatts (mW)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Watt (W))·Unit Specifications: Gigawatt (GW) & Milliwatt (mW)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Power)·Conversion Factors & Mathematical Basis (GW to mW)