Authoritative definitions of the International System of Units and SI prefixes.
Unit conversion
Megawatts to Decibel-milliwatts Converter
1 MW = 90 dBm. Enter a value to convert MW to dBm, then use the formula and table below. Displayed digits may be rounded.
Electrical unitsInstant result
Decimals
Formula result = 10 × log10(input × 1000000) + 30. 1 MW = 90 dBm
Nonzero results too small for the selected decimal places use scientific notation.
Nonzero results too small for the selected decimal places use scientific notation.
Common examples
One value, several units
Watts1,000,000 W
Kilowatts1,000 kW
Decibel-milliwatts90 dBm
Conversion table
| MW | dBm |
|---|---|
| 1 MW | 90 dBm |
| 2 MW | 93.0103 dBm |
| 5 MW | 96.9897 dBm |
| 10 MW | 100 dBm |
| 25 MW | 103.9794 dBm |
| 50 MW | 106.9897 dBm |
| 100 MW | 110 dBm |
Conversion chart
1 MW90 dBm
5 MW96.9897 dBm
10 MW100 dBm
25 MW103.9794 dBm
50 MW106.9897 dBm
Worked example
1 MW = 90 dBm. Apply the selected conversion formula to other input values.
Unit definition
Megawatts (MW) One megawatts equals 1,000,000 watt.
Unit history
Megawatts 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 MW to watt.
3. Convert the base value to dBm and apply your display precision.
Understand the result before using it
Megawatts to Decibel-milliwatts converts a value measured in Megawatts (MW) into the equivalent value in Decibel-milliwatts (dBm). 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
result = 10 × log10(input × 1000000) + 30
Assumptions
- Megawatts and Decibel-milliwatts represent the same electrical power quantity.
- The input is expressed in MW; the output is expressed in dBm.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 MW = 90 dBm. 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 MW measurement in a document that expects dBm.
- Compare a megawatts value with a value reported in decibel-milliwatts.
- Check the MW to dBm arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse MW 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 Megawatts to Decibel-milliwatts?
result = 10 × log10(input × 1000000) + 30. Input is in MW; result is in dBm. 1 MW = 90 dBm. The displayed digits may be rounded.
What is 1 MW in dBm?
1 MW = 90 dBm. The displayed digits may be rounded. Use the full formula for other inputs; offset, reciprocal, and logarithmic scales cannot generally use this example as a multiplier.
Can I reverse the MW to dBm conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts dBm back to MW.
Is the Megawatts to Decibel-milliwatts 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.