diff --git a/EDMarketConnector.py b/EDMarketConnector.py
index d79f1c8a..84ed2530 100755
--- a/EDMarketConnector.py
+++ b/EDMarketConnector.py
@@ -1048,6 +1048,12 @@ if __name__ == "__main__":
     Translations.install(config.get('language') or None)  # Can generate errors so wait til log set up
 
     root = tk.Tk(className=appname.lower())
+    ui_scaling = config.get('ui_scaling')
+    if not ui_scaling:
+        ui_scaling = '0.0'
+        config.set('ui_scaling', ui_scaling)
+    if ui_scaling != '0.0':
+        root.tk.call('tk', 'scaling', float(ui_scaling))
     app = AppWindow(root)
 
     def messagebox_not_py3():
diff --git a/L10n/en.template b/L10n/en.template
index 97e0d8b9..bc307293 100644
--- a/L10n/en.template
+++ b/L10n/en.template
@@ -526,3 +526,8 @@
 /* Shortcut settings prompt on OSX. [prefs.py] */
 "{APP} needs permission to use shortcuts" = "{APP} needs permission to use shortcuts";
 
+/* Label for 'UI Scaling' option [prefs.py] */
+"UI Scaling" = "UI Scaling";
+
+/* Text describing that value '0.0' means 'default' [prefs.py] */
+"0.0 means Default" = "0.0 means Default";
diff --git a/prefs.py b/prefs.py
index 5af25814..0e64f377 100644
--- a/prefs.py
+++ b/prefs.py
@@ -337,6 +337,26 @@ class PreferencesDialog(tk.Toplevel):
         self.theme_label_1.grid(row=21, padx=PADX, sticky=tk.W)
         self.theme_button_1 = nb.ColoredButton(themeframe, text='  Hutton Orbital  ', background='grey4', command=lambda:self.themecolorbrowse(1))	# Do not translate
         self.theme_button_1.grid(row=21, column=1, padx=PADX, pady=PADY, sticky=tk.NSEW)
+
+        # UI Scaling
+        ttk.Separator(themeframe, orient=tk.HORIZONTAL).grid(columnspan=4, padx=PADX, pady=PADY*4, sticky=tk.EW)
+        nb.Label(themeframe, text=_('UI Scaling')).grid(row = 23, padx=PADX, pady=2*PADY, sticky=tk.W)
+        self.ui_scaling = tk.DoubleVar()
+        self.ui_scaling.set(float(config.get('ui_scaling')))
+        self.uiscale_bar = tk.Scale(
+            themeframe,
+            variable=self.ui_scaling,
+            orient=tk.HORIZONTAL,
+            length=300,
+            from_=0.0,
+            to=4.0,
+            tickinterval=0.5,
+            resolution=0.1,
+        )
+        self.uiscale_bar.grid(row=23, column=1, sticky=tk.W)
+        self.ui_scaling_defaultis = nb.Label(themeframe, text=_('0.0 means Default')).grid(row=23, column=3, padx=PADX, pady=2*PADY, sticky=tk.E)
+
+        # Always on top
         ttk.Separator(themeframe, orient=tk.HORIZONTAL).grid(columnspan=3, padx=PADX, pady=PADY*4, sticky=tk.EW)
         self.ontop_button = nb.Checkbutton(themeframe, text=_('Always on top'), variable=self.always_ontop, command=self.themevarchanged)
         self.ontop_button.grid(columnspan=3, padx=BUTTONX, sticky=tk.W)	# Appearance setting
@@ -628,6 +648,8 @@ class PreferencesDialog(tk.Toplevel):
         config.set('language', lang_codes.get(self.lang.get()) or '')
         Translations.install(config.get('language') or None)
 
+        config.set('ui_scaling', str(self.ui_scaling.get()))
+        # self.tk.call('tk', 'scaling', self.ui_scaling.get())
         config.set('always_ontop', self.always_ontop.get())
         config.set('theme', self.theme.get())
         config.set('dark_text', self.theme_colors[0])