dB / dBm / W / Vrms Converter

Convert RF power and voltage units quickly with selectable system impedance.

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Input type

dBm

System impedance (ohms)

Action

Ready.

dBmN/A

dBWN/A

Watt (W)N/A

Milliwatt (mW)N/A

VrmsN/A

VpeakN/A

VppN/A

IrmsN/A

dBm = 10 * log10(P in mW)
dBW = 10 * log10(P in W)
P = Vrms^2 / Z0

Engineering Notes

dBm, watt, and voltage conversion is frequently required during gain budget checks and interface validation. Voltage and current values depend on impedance, so always confirm Z0 before communicating Vrms-based results.

Document the impedance assumption in report tables.
Use this as a quick conversion tool, then confirm critical points with instrument measurements.