Convert between RF power and voltage levels. Choose an impedance, then enter any one value; the remaining values update automatically in your browser.
mW
W
dBm
dBW
V
V
Vpp
dBmV
Conversion notes
The voltage conversions assume a sine wave across a purely resistive load. The calculator uses RMS voltage as the link between power and voltage:
P = Vrms² / R
Vpeak = Vrms × √2
Vpp = 2 × Vpeak
dBm = 10 × log₁₀(P / 1 mW)
dBmV = 20 × log₁₀(Vrms / 1 mV)
In RF systems, 50 Ω is the most common impedance. Cable television and video systems commonly use 75 Ω, while 600 Ω is historically associated with balanced audio and telecommunications circuits.
Useful reference points
| dBm | Power |
|---|---|
| -30 dBm | 1 µW |
| -20 dBm | 10 µW |
| -10 dBm | 100 µW |
| 0 dBm | 1 mW |
| 10 dBm | 10 mW |
| 20 dBm | 100 mW |
| 30 dBm | 1 W |
| 40 dBm | 10 W |
Adding 3 dB approximately doubles power; adding 10 dB multiplies power by ten.