Milliwatt is 0.001 watt units.
Milliwatts to Exawatts Converter — mW to EW
Convert Milliwatt (mW) to Exawatt (EW) using the exact conversion factor (1 milliwatt = 1e-21 exawatt). See the formula, worked examples, and conversion table.
Milliwatts to Exawatts converter
Converter
Power Converter
Convert watts, horsepower, refrigeration tons, BTU per hour, and engineering power units.
Context values
Some unit families need one extra value for a physically accurate result.
Exawatt is 1000000000000000000 watt units.
Result = input x 0.001 / 1e+18.
Power uses the watt as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Milliwatts to Exawatts
Milliwatt and Exawatt both describe power output, and the conversion is a routine part of comparing an engine or motor's spec sheet across countries that use different power units. Specifically: Milliwatt is 0.001 watt units, and exawatt is 1000000000000000000 watt units.
Formula
exawatts = milliwatts × 1e-21
This factor comes from each unit's defined relationship to the category's base unit: 1 milliwatt equals 0.001 base units, and 1 exawatt equals 1e+18 base units, so dividing one by the other gives the direct milliwatt-to-exawatt factor of 1e-21.
Simple example
1 mW × 1e-21 = 1e-21 EW
1 milliwatt = 1e-21 exawatts.
Real-world example
100 mW × 1e-21 = 1e-19 EW
100 milliwatts = 1e-19 exawatts.
Conversion table
| Milliwatt (mW) | Exawatt (EW) |
|---|---|
| 1 mW | 1e-21 EW |
| 10 mW | 1e-20 EW |
| 100 mW | 1e-19 EW |
| 500 mW | 5e-19 EW |
| 1,000 mW | 1e-18 EW |
| 5,000 mW | 5e-18 EW |
Reverse conversion: Exawatt to Milliwatt
1e-21 EW × 1e+21 = 1 mW
1e-21 exawatts = 1 milliwatts.
milliwatts = exawatts × 1e+21
For a page dedicated to this direction, see Exawatt to Milliwatt.
Understanding the Milliwatt (mW)
Milliwatt is 0.001 watt units.
Understanding the Exawatt (EW)
Exawatt is 1000000000000000000 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many exawatts are in 1 milliwatt?
1 milliwatt equals 1e-21 exawatts, using the exact defined conversion factor rather than an estimate.
How do I convert milliwatt to exawatt?
Multiply the milliwatt value by 1e-21. The converter above does this instantly to whatever precision you set.
How do I convert exawatt back to milliwatt?
Use the reverse factor: 1 exawatt equals 1e+21 milliwatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a milliwatt?
Milliwatt (mW) is a unit of power.
What is a exawatt?
Exawatt (EW) is a unit of power.
Is the milliwatt to exawatt conversion exact?
Yes. Both milliwatt and exawatt are defined by fixed standards rather than physical artifacts, so the factor of 1e-21 used above is exact to as many digits as you choose to display.