diff --git a/src/main/python/macro_recorder.py b/src/main/python/macro_recorder.py
index 3802c1e..8b6266f 100644
--- a/src/main/python/macro_recorder.py
+++ b/src/main/python/macro_recorder.py
@@ -123,8 +123,10 @@ class MacroRecorder(BasicEditor):
             w.setLayout(tab)
             self.tabs.addTab(w, "Macro {}".format(x + 1))
 
+        self.lbl_memory = QLabel()
+
         buttons = QHBoxLayout()
-        buttons.addWidget(QLabel("Memory used by macros: 123/345"))
+        buttons.addWidget(self.lbl_memory)
         buttons.addStretch()
         buttons.addWidget(QPushButton("Save"))
         buttons.addWidget(QPushButton("Revert"))
@@ -132,6 +134,8 @@ class MacroRecorder(BasicEditor):
         self.addWidget(self.tabs)
         self.addLayout(buttons)
 
+        self.on_change()
+
     def valid(self):
         return isinstance(self.device, VialKeyboard)
 
@@ -165,5 +169,7 @@ class MacroRecorder(BasicEditor):
         self.keystrokes.append(keystroke)
 
     def on_change(self):
+        memory = 0
         for x, macro in enumerate(self.macro_tabs):
-            print(x, macro.serialize())
+            memory += len(macro.serialize())
+        self.lbl_memory.setText("Memory used by macros: {}/345".format(memory))