Wi-Fi Signal Strength

Wi-Fi Signal Strength: What Is a Good Signal And How Do You Measure It?

There are many apps available for cell phones which identify all wireless networks in range of the phone, and measure the strength of those networks. The app I use is WiFiAnalyzer, and I got it for free from the Google Play Store. I selected it because it is (supposedly) ad-free.

This is the icon for the app: .

Wireless signal strength is measured in dBm (decibel milliwatts) and is (somewhat confusingly) expressed only as negative values. The following graphic shows what Wi-Fi signal strengths are good, acceptable, and poor.