Tag Archives: wifi

Tom Carpenter’s WiFiScan Tool

NOTE: Tool has been updated to resolve problems on some systems. (Feb. 13, 2017)

OK. I have a problem with NETSH. It shows signal levels in percentages based on a known algorithm, but gives no option to show dBm levels. Hence, WiFiScan.exe. This little tool will pull the NETSH information in, convert signal strength to show dBm as well (for strengths weaker than -50 and stronger than -100) and show them parenthetically after the percentage info. The command is the same as:


It goes against the default WLAN interface and has no parameters. I may modify it to allow for interface specification, but it serves my purpose for now. By the way, the conversion to dBm follows this logic:

if(quality <= 0)
    dBm = -100
else if(quality >= 100)
    dBm = -50 or better
    dBm = (quality / 2) - 100

The wifiscan.exe tool should be run while not connected to a WLAN. It will sort of work if you’re connected, but give you an error related to an array. I may fix that when energy returns. Here’s the tool, feel free to download and use at your own risk [smile]:

Download the Feb. 13, 2017 WiFiScan tool.