Enter the value in dBm and select the target dB unit to convert the power level into dBW, dBµW, dBk, or keep it in dBm.

dBm to dB List Converter

Enter a dBm value and choose the target dB unit

Result will appear here.

dBm to dB List Formula

The following formula is used to convert a value in dBm to another dB unit with a different reference power.

dB_{target} = dBm + offset

Variables:

  • dBtarget is the converted value in the selected dB unit
  • dBm is the original power level referenced to 1 mW
  • offset is the constant adjustment based on the target reference power

Common offsets are -30 for dBW, 0 for dBm, +30 for dBµW, and -60 for dBk.

In logarithmic form, dBm is defined as the power level relative to 1 mW. When converting to another dB scale, the actual power stays the same and only the numerical value changes because the reference power changes.

What is a dBm to dB List Conversion?

A dBm to dB list conversion changes a power measurement from dBm, which is referenced to 1 milliwatt, into another decibel-based unit such as dBW, dBµW, or dBk. These units all describe the same power level, but they use different reference powers. Because of that, the conversion is done by adding or subtracting a fixed offset.

For example, 30 dBm equals 0 dBW because dBW is referenced to 1 watt, which is 1000 milliwatts. Likewise, 30 dBm equals 60 dBµW because dBµW is referenced to 1 microwatt.

How to Calculate dBm to dB List?

The following steps outline how to convert dBm into another dB unit.

  1. First, determine the input power level in dBm.
  2. Next, choose the target dB unit such as dBW, dBm, dBµW, or dBk.
  3. Find the correct offset for that unit relative to dBm.
  4. Calculate the result using dBtarget = dBm + offset.
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem:

Convert 30 dBm into dBW, dBµW, and dBk.

dBW = 30 – 30 = 0 dBW

dBµW = 30 + 30 = 60 dBµW

dBk = 30 – 60 = -30 dBk

dBm to dB List Conversion Table

The table below shows how a 30 dBm signal appears in several different dB units.

Target dB UnitReference Power30 dBm Expressed in Target Unit
dBm1 mW30 dBm
dBW1 W0 dBW
dBµW1 µW60 dBµW
dBk1 kW-30 dBk

Once you know the reference power used by each dB unit, converting from dBm becomes a simple matter of adding or subtracting the correct constant offset.