Terawatts to Milliwatts Converter
Enter the power in terawatts below to convert it to milliwatts.
Convert Terawatts to Milliwatts
Enter a value in terawatts (TW) to convert to milliwatts (mW).
Terawatt to Milliwatt Conversion Table
Table showing various terawatt measurements converted to milliwatts. Click any preset value or arrow to load it into the converter.
| Terawatts (TW) | Milliwatts (mW) |
|---|---|
| 0.0000001 TW | 100,000,000 mW |
| 0.0000002 TW | 200,000,000 mW |
| 0.0000003 TW | 300,000,000 mW |
| 0.0000004 TW | 400,000,000 mW |
| 0.0000005 TW | 500,000,000 mW |
| 0.0000006 TW | 600,000,000 mW |
| 0.0000007 TW | 700,000,000 mW |
| 0.0000008 TW | 800,000,000 mW |
| 0.0000009 TW | 900,000,000 mW |
| 0.00000001 TW | 10,000,000 mW |
How to Convert Terawatts to Milliwatts
To convert terawatts to milliwatts, multiply the power by the following conversion ratio: 1e+15 milliwatts/terawatt.
Since one terawatt is equal to 1e+15 milliwatts, you can use this simple formula to convert:
The power in milliwatts is equal to the power in terawatts multiplied by 1e+15.
For example, here's how to convert 5 terawatts to milliwatts using the formula above.
How Many Milliwatts Are in a Terawatt?
There are 1e+15 milliwatts in a terawatt, which is why we use this value in the formula above.
Our terawatt to milliwatt calculator automatically converts your power measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Terawatts and milliwatts 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 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 terawatts (TW) and milliwatts (mW), keep full floating-point precision (1 TW = 1e+15 mW; 1 mW = 1e-15 TW) during intermediate calculations and round only the final milliwatt figure to match your instrument tolerance.
More Terawatt & Milliwatt Conversions
Need to calculate in the opposite direction? Use our milliwatts to terawatts calculator to switch your starting unit immediately. You can also explore related tools such as converting milliwatts to terawatts, converting watts to horsepower (hp), or converting horsepower (hp) to watts.
Convert from Terawatts
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 Milliwatts (mW)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Watt (W))·Unit Specifications: Terawatt (TW) & Milliwatt (mW)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Power)·Conversion Factors & Mathematical Basis (TW to mW)