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Conversion between linear and decibel units for voltage V [V], current I [A] and power P [W] on conducted transmission lines.
Reference impedance Z0
Ω (resistive load assumed)
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
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
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