{
  "id": "dbm-to-watts",
  "slug": "dbm-to-watts",
  "url": "https://electronics.tools/tools/dbm-to-watts/",
  "name": "dBm to Watts Converter",
  "group": "rf",
  "summary": "P(W) = 10^((dBm − 30)/10). 0 dBm is 1 mW.",
  "formulas": [
    {
      "id": "dbm-w",
      "label": "dBm to watts",
      "plain": "P(W) = 10^((dBm − 30)/10)",
      "mathml": "<math display=\"block\" xmlns=\"http://www.w3.org/1998/Math/MathML\" aria-label=\"P(W) = 10^((dBm − 30)/10)\"><mrow><mi>P</mi><mo>=</mo><msup><mn>10</mn><mrow><mrow><mo>(</mo><mrow><mi>dBm</mi><mo>-</mo><mn>30</mn></mrow><mo>)</mo></mrow><mo>/</mo><mn>10</mn></mrow></msup></mrow></math>",
      "symbols": [
        "P",
        "dBm"
      ],
      "sources": [
        "itu"
      ]
    },
    {
      "id": "dbw",
      "label": "dBW",
      "plain": "dBW = dBm − 30",
      "mathml": "<math display=\"block\" xmlns=\"http://www.w3.org/1998/Math/MathML\" aria-label=\"dBW = dBm − 30\"><mrow><mi>dBW</mi><mo>=</mo><mi>dBm</mi><mo>-</mo><mn>30</mn></mrow></math>",
      "symbols": [
        "dBW",
        "dBm"
      ],
      "sources": [
        "itu"
      ]
    }
  ],
  "variables": [
    {
      "symbol": "dBm",
      "name": "Power",
      "unit": "dBm",
      "role": "input",
      "precision": {
        "sig": 4
      },
      "default": 0,
      "urlParam": "dbm"
    },
    {
      "symbol": "P",
      "name": "Power (optional, instead of dBm)",
      "unit": "W",
      "role": "input",
      "precision": {
        "sig": 4
      },
      "default": "",
      "urlParam": "w"
    },
    {
      "symbol": "dBW",
      "name": "Power",
      "unit": "dBW",
      "role": "output",
      "precision": {
        "sig": 4
      }
    }
  ],
  "examples": [
    {
      "id": "0dbm",
      "title": "0 dBm = 1 mW",
      "input": [
        {
          "symbol": "dBm",
          "value": 0,
          "unit": "dBm",
          "display": "0 dBm"
        }
      ],
      "output": [
        {
          "symbol": "P",
          "value": 0.001,
          "unit": "W",
          "display": "1 mW"
        },
        {
          "symbol": "dBW",
          "value": -30,
          "unit": "dBW",
          "display": "-30 dBW"
        }
      ],
      "computedBy": "dbmWatts"
    },
    {
      "id": "30dbm",
      "title": "30 dBm = 1 W",
      "input": [
        {
          "symbol": "dBm",
          "value": 30,
          "unit": "dBm",
          "display": "30 dBm"
        }
      ],
      "output": [
        {
          "symbol": "P",
          "value": 1,
          "unit": "W",
          "display": "1 W"
        },
        {
          "symbol": "dBW",
          "value": 0,
          "unit": "dBW",
          "display": "0 dBW"
        }
      ],
      "computedBy": "dbmWatts"
    },
    {
      "id": "5w",
      "title": "5 W",
      "input": [
        {
          "symbol": "P",
          "value": 5,
          "unit": "W",
          "display": "5 W"
        }
      ],
      "output": [
        {
          "symbol": "dBm",
          "value": 36.98970004336019,
          "unit": "dBm",
          "display": "36.99 dBm"
        },
        {
          "symbol": "dBW",
          "value": 6.9897000433601875,
          "unit": "dBW",
          "display": "6.99 dBW"
        }
      ],
      "computedBy": "dbmWatts"
    }
  ],
  "sources": [
    {
      "title": "ITU-R V.574 — Use of the decibel and the neper in telecommunications",
      "url": "https://www.itu.int/rec/R-REC-V.574/en",
      "retrieved": "2026-11-02",
      "standard": "ITU-R V.574"
    }
  ],
  "datePublished": "2026-11-02T00:00:00+08:00",
  "dateModified": "2026-11-02T00:00:00+08:00",
  "author": {
    "name": "Jasper",
    "url": "https://electronics.tools/about/#jasper"
  },
  "relatedTools": [
    "https://electronics.tools/tools/power-calculator/",
    "https://electronics.tools/tools/ohms-law-calculator/",
    "https://electronics.tools/tools/pi-attenuator-calculator/"
  ]
}