RF 50Ω impedance system linked converter
Linked conversion between dBm, mW, dBµV, mV, dBµA and mA in a 50Ω RF system. Enter any value and all units update in real time.
Formulas
dBm = dBµV − 107 (50Ω)
dBµA = dBm + 73 (50Ω)
V = √(P · 50)
I = V / 50
Engineering background
In a 50Ω RF system, power, voltage and current are linked by R: P = V²/R = I²·R. Entering any value derives all others, useful for converting receiver readings and source levels.
Key benefits
Enter any of dBm, mW, dBµV, mV, dBµA or mA and instantly get the other five, with no step-by-step math.
Bakes in the 50Ω impedance relation (dBm = dBµV − 107), so results match spectrum-analyzer and receiver readings.
Ideal for RF links, EMI measurements and antenna-interface level checks.
How to use
- 1 Type a known value into any field (e.g. a receiver reading of 47 dBµV).
- 2 The other fields update live with the corresponding power, voltage and current.
- 3 Click "Share link" to save the state.
Use cases
- › Convert a spectrum-analyzer dBµV reading to dBm for comparison with transmitter specs.
- › Switch between voltage, current and power during EMI receiver measurements.
- › RF link loss accounting: derive port dBµV from source dBm.
FAQ
Why does dBm = dBµV − 107 in a 50Ω system?
From P = V²/R and 0 dBm = 1 mW: V = √(0.001·50) = 0.2236 V = 107 dBµV, so dBm = dBµV − 107.
Can I use this for a 75Ω system?
This tool is fixed at 50Ω. In 75Ω the relation differs (dBm = dBµV − 108.75) and must be calculated separately.