dBm converter

Convert between dBm, mW/W, and RMS voltage across a 50 Ω (or custom) resistive load.

Calculated in this browser. Nothing is sent anywhere.

dBm -200–200, power 10⁻²⁴–10²⁴ mW, load 1–10,000 Ω (presets 50/75). Vrms is the RMS voltage of a sine wave across a purely resistive load. These relate power and voltage — they don't model impedance matching or VSWR.

How to use

  1. Enter any one of dBm, power, or volts.
  2. Set the load impedance (50/75 Ω presets).
  3. Read the equivalent values.

What it supports

dBm −200–200, power 10⁻²⁴–10²⁴ mW, load 1–10,000 Ω. Vrms is the RMS of a sine wave across a purely resistive load — impedance matching and VSWR are not modelled.

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