diff --git a/src/Kaleidoscope/EEPROM-Settings-Focus.cpp b/src/Kaleidoscope/EEPROM-Settings-Focus.cpp
index d87943e7..40d201e2 100644
--- a/src/Kaleidoscope/EEPROM-Settings-Focus.cpp
+++ b/src/Kaleidoscope/EEPROM-Settings-Focus.cpp
@@ -60,6 +60,7 @@ namespace FocusHooks {
 
   bool eeprom (const char *command) {
     enum {
+      FREE,
       DUMP,
       UPLOAD,
     } subCommand;
@@ -68,6 +69,8 @@ namespace FocusHooks {
       subCommand = DUMP;
     else if (strcmp_P (command, PSTR ("eeprom.upload")) == 0)
       subCommand = UPLOAD;
+    else if (strcmp_P (command, PSTR ("eeprom.free")) == 0)
+      subCommand = FREE;
     else
       return false;
 
@@ -87,6 +90,9 @@ namespace FocusHooks {
         EEPROM.update (i, d);
       }
       break;
+    case FREE:
+      Serial.println (EEPROM.length () - EEPROMSettings.used ());
+      break;
     }
 
     return true;
diff --git a/src/Kaleidoscope/EEPROM-Settings-Focus.h b/src/Kaleidoscope/EEPROM-Settings-Focus.h
index 54fc0f12..3e084e8b 100644
--- a/src/Kaleidoscope/EEPROM-Settings-Focus.h
+++ b/src/Kaleidoscope/EEPROM-Settings-Focus.h
@@ -31,5 +31,6 @@ namespace FocusHooks {
                                        "settings.crc")
 
 #define FOCUS_HOOK_EEPROM FOCUS_HOOK(FocusHooks::eeprom,                \
+                                     "eeprom.free\n"                    \
                                      "eeprom.dump\n"                    \
                                      "eeprom.upload")
diff --git a/src/Kaleidoscope/EEPROM-Settings.cpp b/src/Kaleidoscope/EEPROM-Settings.cpp
index 1c384596..5ef289f9 100644
--- a/src/Kaleidoscope/EEPROM-Settings.cpp
+++ b/src/Kaleidoscope/EEPROM-Settings.cpp
@@ -82,6 +82,11 @@ namespace KaleidoscopePlugins {
     _isValid = false;
   }
 
+  uint16_t
+  EEPROMSettings::used (void) {
+    return nextStart;
+  }
+
   void
   EEPROMSettings::update (void) {
     settings.crc = CRC.crc;
diff --git a/src/Kaleidoscope/EEPROM-Settings.h b/src/Kaleidoscope/EEPROM-Settings.h
index 02cc7d54..3cd95e82 100644
--- a/src/Kaleidoscope/EEPROM-Settings.h
+++ b/src/Kaleidoscope/EEPROM-Settings.h
@@ -37,6 +37,7 @@ namespace KaleidoscopePlugins {
     static uint16_t requestSlice (uint16_t size);
     static void seal (void);
     static uint16_t crc (void);
+    static uint16_t used (void);
 
   private:
     static uint16_t nextStart;