Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Decibel-milliwatts to Megawatts
Convert dBm to MW instantly, then review the formula, assumptions, and rounding guidance.
Electrical unitsInstant result
Decimals
Formula Convert dBm to watt, then convert to MW. 1 dBm = 0 MW
Common examples
One value, several units
Watts0.0013 W
Kilowatts0 kW
Megawatts0 MW
Conversion table
| dBm | MW |
|---|---|
| 1 dBm | 0 MW |
| 2 dBm | 0 MW |
| 5 dBm | 0 MW |
| 10 dBm | 0 MW |
| 25 dBm | 0 MW |
| 50 dBm | 0.0001 MW |
| 100 dBm | 10 MW |
Conversion chart
1 dBm0 MW
5 dBm0 MW
10 dBm0 MW
25 dBm0 MW
50 dBm0.0001 MW
Worked example
0 dBm equals 1 milliwatt.
Unit definition
Decibel-milliwatts (dBm) This unit is defined through the displayed non-linear relationship to watt.
Unit history
Decibel-milliwatts is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert dBm to watt.
3. Convert the base value to MW and apply your display precision.
Understand the result before using it
Decibel-milliwatts to Megawatts converts a value measured in Decibel-milliwatts (dBm) into the equivalent value in Megawatts (MW). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
Convert dBm to watt, then convert the base value to MW.
Assumptions
- Decibel-milliwatts and Megawatts represent the same electrical power quantity.
- The input is expressed in dBm; the output is expressed in MW.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 dBm = 0.00000000125892541179 MW. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a dBm measurement in a document that expects MW.
- Compare a decibel-milliwatts value with a value reported in megawatts.
- Check the dBm-to-MW arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse dBm with another unit that has a similar name or symbol.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Decibel-milliwatts to Megawatts?
Convert dBm to watt, then convert the base value to MW. Using the displayed relationship, 1 dBm equals 0.00000000125892541179 MW.
How many Megawatts are in one Decibel-milliwatts?
One Decibel-milliwatts is 0.00000000125892541179 Megawatts. The displayed digits may be rounded.
Can I reverse the dBm to MW conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts MW back to dBm.
Is the Decibel-milliwatts to Megawatts result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.