---
title: "Convert a power level in dBm to milliwatts, watts, dBW, and RMS voltage across a given impedance. dBm is the standard unit for RF power referenced to 1 milliwatt. This tool is essential when interfacing datasheets (which use dBm) with circuit analysis (which uses volts and watts). Default impedance is 50 ohms, matching most RF systems. Use this to quickly verify power amplifier output, receiver sensitivity, or regulatory EIRP limits."
method: POST
path: "/api/dbm_convert"
tags: ["rf"]
---

# Convert a power level in dBm to milliwatts, watts, dBW, and RMS voltage across a given impedance. dBm is the standard unit for RF power referenced to 1 milliwatt. This tool is essential when interfacing datasheets (which use dBm) with circuit analysis (which uses volts and watts). Default impedance is 50 ohms, matching most RF systems. Use this to quickly verify power amplifier output, receiver sensitivity, or regulatory EIRP limits.

`POST /api/dbm_convert`

## Request

- Base URL: `https://calc.engineer`
- URL: `https://calc.engineer/api/dbm_convert`
- Auth: none declared

## Request body

- object
  - `dbm` number, required: Power level in dBm (decibels relative to 1 milliwatt)
  - `impedance_ohm` number: Load impedance in ohms for Vrms calculation (default 50)

## Response `200`

Computed result for dbm_convert

- object
  - `result` object, required
    - `mw` number, required: Power in milliwatts
    - `watts` number, required: Power in watts
    - `vrms` number, required: RMS voltage across the load impedance in volts
    - `dbw` number, required: Power in dBW (decibels relative to 1 watt)
  - `tool` string, required
  - `version` string, required
  - `computed_at` string, date-time, required
  - `chain` object, required
    - `feeds` unknown[]
      - unknown
    - `accepts_from` unknown[]
      - unknown

## Other responses

- `400`: Validation error or invalid JSON
- `404`: Tool not found

---

[API](https://skmtc.dev/calc/apis/calc-engineer-api.md) · [All operations](https://skmtc.dev/calc/apis/calc-engineer-api/llms.txt) · [OpenAPI document](https://skmtc.dev/calc/apis/calc-engineer-api/revisions/8830480ec488?raw)