Milliwatts to Gigawatts Converter
Enter the power in milliwatts below to convert it to gigawatts.
Convert Milliwatts to Gigawatts
Enter a value in milliwatts (mW) to convert to gigawatts (GW).
Milliwatt to Gigawatt Conversion Table
Table showing various milliwatt measurements converted to gigawatts. Click any preset value or arrow to load it into the converter.
| Milliwatts (mW) | Gigawatts (GW) |
|---|---|
| 1 mW | 1e-12 GW |
| 10 mW | 1e-11 GW |
| 100 mW | 1e-10 GW |
| 1,000 mW | 1e-9 GW |
| 10,000 mW | 0.00000001 GW |
| 100,000 mW | 0.0000001 GW |
| 1,000,000 mW | 0.000001 GW |
| 5,000,000 mW | 0.000005 GW |
| 10,000,000 mW | 0.00001 GW |
| 25,400,000 mW | 0.0000254 GW |
How to Convert Milliwatts to Gigawatts
To convert milliwatts to gigawatts, multiply the power by the following conversion ratio: 1e-12 gigawatts/milliwatt.
Since one milliwatt is equal to 1e-12 gigawatts, you can use this simple formula to convert:
The power in gigawatts is equal to the power in milliwatts multiplied by 1e-12.
For example, here's how to convert 5 milliwatts to gigawatts using the formula above.
How Many Gigawatts Are in a Milliwatt?
There are 1e-12 gigawatts in a milliwatt, which is why we use this value in the formula above.
Our milliwatt to gigawatt calculator automatically converts your power measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milliwatts and gigawatts are both units used to measure power. Keep reading to learn more about each unit.
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. [1]
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.
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 milliwatts (mW) and gigawatts (GW), keep full floating-point precision (1 mW = 1e-12 GW; 1 GW = 1e+12 mW) during intermediate calculations and round only the final gigawatt figure to match your instrument tolerance.
More Milliwatt & Gigawatt Conversions
Need to calculate in the opposite direction? Use our gigawatts to milliwatts calculator to switch your starting unit immediately. You can also explore related tools such as converting gigawatts to milliwatts, converting watts to horsepower (hp), or converting horsepower (hp) to watts.
Convert from Milliwatts
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Power & Radiant Flux))·Power Metrology Standard — Milliwatts (mW) to Gigawatts (GW)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Watt (W))·Unit Specifications: Milliwatt (mW) & Gigawatt (GW)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Power)·Conversion Factors & Mathematical Basis (mW to GW)