This RF unit converter relates voltage, power, dBm, and dBuV for a specified resistive impedance.
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RF Unit Converter
Convert RF voltage and power levels for a specified impedance.
Calculator
About this calculator
Formula notes
P = Vrms^2 / Z; dBm = 10 log10(P / 1 mW); dBuV = 20 log10(Vrms / 1 uV); Vpeak = Vrms x sqrt(2).
Worked examples
- Example: 0 dBm into 50 ohm is 1 mW, about 223.61 mV RMS and 447.21 mV peak.
- A 1 V RMS signal across 50 ohm delivers 20 mW, equal to 13.01 dBm and 120 dBuV.
How to use it
- Choose the input type such as Volts RMS, Watts, dBm, or dBuV.
- Enter the value and the system impedance.
- Read voltage, current, power, dBm, and dBuV outputs.
Frequently asked questions
What reference levels are used?
dBm uses 1 mW and dBuV uses 1 uV; both follow the standard RF definitions.
Why is impedance required for a voltage input?
The tool also reports power, current, and logarithmic levels, so the load impedance is needed for a consistent set of results.
Limits and interpretation
- The equations assume a purely resistive load and sinusoidal RMS relationships; reactive loads, waveform shape, and mismatch affect real RF measurements.
- dBm and dBuV are absolute references (1 mW and 1 uV); they are not cable loss, antenna gain, or EIRP calculators.