Decibel-milliwatt to Decibel-watt Converter
0 dBm is -30 dBW. Convert decibel-milliwatts (dBm) to decibel-watts (dBW) below: type a value and the result updates as you type.
dBm to dBW calculator
Result
Decibel-milliwatt to Decibel-watt conversion
1 dBm = -29 dBWone decibel-milliwatt in decibel-watts
1 dBW = 31 dBmone decibel-watt in decibel-milliwatts
Decibel-milliwatt (dBm): Power level relative to one milliwatt: 10 times the base-10 logarithm of the power in milliwatts. 0 dBm is 1 mW and 30 dBm is 1 W.
Decibel-watt (dBW): Power level relative to one watt: 10 times the base-10 logarithm of the power in watts. 0 dBW is 1 W.
Source:IEC 60027-3:2002, Logarithmic and related quantities, and their units
How to convert decibel-milliwatts to decibel-watts
To convert decibel-milliwatts to decibel-watts, subtract 30 decibels.
Formula
dBW = dBm − 30
Examples
- 0 dBm = 0 − 30 = -30 dBW
- 20 dBm = 20 − 30 = -10 dBW
- 30 dBm = 30 − 30 = 0 dBW
Decibel-milliwatt to Decibel-watt conversion table
| Decibel-milliwatt (dBm) | Decibel-watt (dBW) |
|---|---|
| -60 dBm | -90 dBW |
| -30 dBm | -60 dBW |
| -20 dBm | -50 dBW |
| -10 dBm | -40 dBW |
| 0 dBm | -30 dBW |
| 3 dBm | -27 dBW |
| 10 dBm | -20 dBW |
| 13 dBm | -17 dBW |
| 20 dBm | -10 dBW |
| 23 dBm | -7 dBW |
| 30 dBm | 0 dBW |
| 40 dBm | 10 dBW |
| 50 dBm | 20 dBW |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- What is 0 dBm in dBW?
- 0 dBm is -30 dBW. To convert decibel-milliwatts to decibel-watts, subtract 30 decibels.
- How do I convert decibel-watts to decibel-milliwatts?
- To convert decibel-watts to decibel-milliwatts, add 30 decibels. The formula is dBm = dBW + 30.
- Is this conversion exact?
- Yes. Both units have exact definitions and the factor 30 is exact. Displayed results are only rounded when they have many decimal places.