diff --git a/src/app/ConnectivityManager.cpp b/src/app/ConnectivityManager.cpp
index 95bf9e1..4ee7c0e 100644
--- a/src/app/ConnectivityManager.cpp
+++ b/src/app/ConnectivityManager.cpp
@@ -49,6 +49,12 @@ boolean ConnectivityManager::enableSTAAndAP(boolean enabled)
   return enableSTA(enabled) && enableAP(enabled);
 }
 
+unsigned char ConnectivityManager::RSSIPercent()
+{
+  int RSSIdBm = RSSI();
+  return COEF_RSSI * ((double)RSSIdBm - (double)MIN_RSSI);
+}
+
 unsigned char ConnectivityManager::getError() const
 {
   return _error;
diff --git a/src/app/ConnectivityManager.h b/src/app/ConnectivityManager.h
index da517ef..2613a33 100644
--- a/src/app/ConnectivityManager.h
+++ b/src/app/ConnectivityManager.h
@@ -7,12 +7,17 @@
 #include "CFGDictionary.h"
 #include "definition.h"
 
+#define MIN_RSSI -81
+#define MAX_RSSI -50
+#define COEF_RSSI 3.225806452
+
 class ConnectivityManager : public ESP8266WiFiClass
 {
   friend class SAB;
   public:
     boolean enableSTAAndAP(boolean enable);
 
+    unsigned char RSSIPercent();
     unsigned char getError() const;
   protected:
     ConnectivityManager();