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Conversion between linear and decibel units for voltage, current and power on conducted transmission lines. Default reference impedance Z₀ = 50 Ω (resistive load assumed).

​

Symbol

V

I

P

​


Quantity

Voltage (RMS)

Current (RMS)

Power

​​


SI unit

V

A

W

​

Relations (resistive load): I = V / Z₀, P = V² / Z₀ = I² · Z₀
 

Reference impedance Z0

Ω

VOLTAGE (RMS)

V

mV

µV

dBV

dBmV

dBµV

CURRENT (RMS)

A

mA

µA

dBA

dBmA

dBµA

POWER (RMS)

W

mW

µW

dBW

dBm

dBµW


Type in any field — all other fields update automatically. All voltages and currents are RMS.
Example: 0 dBm into 50 Ω ≡ 107 dBµV ≡ 223.6 mV​
 



References:
[1] Henry W. Ott, Electromagnetic Compatibility Engineering, John Wiley & Sons, Inc., 2009, pp. 733-739


 

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