uV to dBm Calculator with Formula

Use this calculator to convert from Microvolt (μV) to deciBel milliwatt (dBm).

Note: the impedance will have to be specified and the default value is 50 ohm

🔁 dBm to uV

Formula

dBm = 20*Log₁₀(μV)−10*Log₁₀(Z)−90

where Z is the impedance

Example Calculation

Sometimes a radio manufacturer will specify receiver sensitivity in microvolt and it’s useful to convert to dBm. It can then be used in a receiver chain sensitivity analysis.

For example, the sensitivity of the UV-5R (as shown in the picture below) is 0.2 uV. This is equivalent to -121 dBm.