Watt to dBm Calculator Use this tool to convert from Watt to dBm. You can select either Milliwatt, Microwatt, Nanowatt or Picowatt. This calculator lets you convert from dBm to Watt Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to print (Opens in new window)