Milliwatts to Terawatts Converter
Enter the power in milliwatts below to convert it to terawatts.
Convert Milliwatts to Terawatts
Enter a value in milliwatts (mW) to convert to terawatts (TW).
Milliwatt to Terawatt Conversion Table
Table showing various milliwatt measurements converted to terawatts. Click any preset value or arrow to load it into the converter.
| Milliwatts (mW) | Terawatts (TW) |
|---|---|
| 1 mW | 1e-15 TW |
| 10 mW | 1e-14 TW |
| 100 mW | 1e-13 TW |
| 1,000 mW | 1e-12 TW |
| 10,000 mW | 1e-11 TW |
| 100,000 mW | 1e-10 TW |
| 1,000,000 mW | 1e-9 TW |
| 5,000,000 mW | 5e-9 TW |
| 10,000,000 mW | 0.00000001 TW |
| 25,400,000 mW | 0.000000025 TW |
How to Convert Milliwatts to Terawatts
To convert milliwatts to terawatts, multiply the power by the following conversion ratio: 1e-15 terawatts/milliwatt.
Since one milliwatt is equal to 1e-15 terawatts, you can use this simple formula to convert:
The power in terawatts is equal to the power in milliwatts multiplied by 1e-15.
For example, here's how to convert 5 milliwatts to terawatts using the formula above.
How Many Terawatts Are in a Milliwatt?
There are 1e-15 terawatts in a milliwatt, which is why we use this value in the formula above.
Our milliwatt to terawatt calculator automatically converts your power measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milliwatts and terawatts 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 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). [2]
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.
When converting power between milliwatts (mW) and terawatts (TW), keep full floating-point precision (1 mW = 1e-15 TW; 1 TW = 1e+15 mW) during intermediate calculations and round only the final terawatt figure to match your instrument tolerance.
More Milliwatt & Terawatt Conversions
Need to calculate in the opposite direction? Use our terawatts to milliwatts calculator to switch your starting unit immediately. You can also explore related tools such as converting terawatts 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 Terawatts (TW)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Watt (W))·Unit Specifications: Milliwatt (mW) & Terawatt (TW)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Power)·Conversion Factors & Mathematical Basis (mW to TW)