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dBW to dBm Calculator

dBW to dBm Conversion Calculator

Use this next calculator to convert from dBW (deciBel Watt) to dBm (deciBel milliwatt).

🔁 Convert dBm to dBW

Conversion Formula

Since 1 watt (W) is equal to 1000 milliwatts (mW), the relationship between dBW and dBm is as follows:

PdBm = PdBW + 30

Explanation

  • dBW is referenced to 1 watt.
  • dBm is referenced to 1 milliwatt.
  • Since 1 W = 1000 mW, and 10*Log⁡10(1000)=30, you add 30 to the dBW value to convert it to dBm.

Example Calculations

Convert 5 dBW to dBm

PdBm= 5 dBW + 30 = 35 dBm

Convert -10 dBW to dBm

PdBm= −10 dBW + 30 = 20 dBm

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