How to Use RF Unit Converter
- Enter the numeric value and choose the source unit.
- Choose the target unit from power units or voltage units. Power-to-voltage conversion requires impedance.
- Select 50 Ω for most RF lab systems, 75 Ω for many video/cable systems, or another listed impedance when appropriate.
- Use the secondary result cards to cross-check watts, dBm, and RMS voltage together.
Formula & Theory - RF Unit Converter
dBm = 10 log10(PmW)
dBW = dBm - 30
W = 10^((dBm - 30) / 10)
Vrms = sqrt(PW × Z)
dBµV = 20 log10(VµV)dBm and dBW are logarithmic power units. dBm is referenced to 1 milliwatt, while dBW is referenced to 1 watt.
Voltage units depend on impedance when they are converted to or from power. The calculator assumes RMS voltage and a resistive impedance.
0 dBm equals 1 mW, and 30 dBm equals 1 W. Those reference points are useful sanity checks for RF link budgets and instrument settings.
Use Cases for RF Unit Converter
- Converting signal generator output between dBm and volts.
- Comparing receiver sensitivity given in dBm with field measurements in dBµV.
- Working across 50 Ω RF equipment and 75 Ω cable/video systems.
- Checking RF power references while building a link budget.