diff --git a/src/user_interface.py b/src/user_interface.py
index 10877a1..25c7ec1 100644
--- a/src/user_interface.py
+++ b/src/user_interface.py
@@ -1,7 +1,6 @@
 # This file contains classes to build all elements of the graphical user interface.
 # These classes also contain the methods that are executed when UI elements are activated.
 
-# ToDo: optimize layout for smaller screen (like on IRS clean room PC)
 # import packages for user interface:
 import queue
 from queue import Queue, Empty
@@ -30,11 +29,16 @@ from src.exceptions import DeviceAccessError
 from src.utility import ui_print, save_dict_list_to_csv, load_dict_list_from_csv
 import src.helmholtz_cage_device as helmholtz_cage_device
 
-# define font styles:
-HEADER_FONT = ("Arial", 13, "bold")
-SUB_HEADER_FONT = ("Arial", 9, "bold")
-BIG_BUTTON_FONT = ("Arial", 11, "bold")
-SMALL_BUTTON_FONT = ("Arial", 9)
+# Define global font styles:
+screen_height_limit1 = 1100  # Limit after which font size gets reduced
+screen_height_limit2 = 900  # Limit after which font size gets reduced
+points = [13, 11, 9, 7, 6, 5]
+font = "Arial"
+HEADER_FONT = (font, points[0], "bold")
+SUB_HEADER_FONT = (font, points[2], "bold")
+BIG_BUTTON_FONT = (font, points[1], "bold")
+SMALL_BUTTON_FONT = (font, points[2])
+DEFAULT_FONT = (font, points[2])
 
 
 class HelmholtzGUI(Tk):
@@ -49,6 +53,24 @@ class HelmholtzGUI(Tk):
         except TclError:
             pass
 
+        # Change default fonts if display resolution is too small
+        screen_width = Tk.winfo_screenwidth(self)
+        screen_height = Tk.winfo_screenheight(self)
+        print("Screensize: {} x {}".format(screen_width, screen_height))
+        if screen_height <= screen_height_limit2:
+            red = 2
+        elif screen_height <= screen_height_limit1:
+            red = 1
+        else:
+            red = 0
+        global HEADER_FONT, SUB_HEADER_FONT, BIG_BUTTON_FONT, SMALL_BUTTON_FONT, DEFAULT_FONT
+        HEADER_FONT = (font, points[0+red], "bold")
+        SUB_HEADER_FONT = (font, points[2+red], "bold")
+        BIG_BUTTON_FONT = (font, points[1+red], "bold")
+        SMALL_BUTTON_FONT = (font, points[2+red])
+        DEFAULT_FONT = (font, points[2+red])
+        self.option_add("*font", DEFAULT_FONT)
+
         self.Menu = TopMenu(self)  # display dropdown menu bar at the top (see TopMenu class for details)
 
         # setup status display and output console
@@ -1859,7 +1881,6 @@ class CalibrateMagnetometerComplete(Frame):
         self.clipboard_append(self.clipboard)
         self.update()
 
-
     def copy_to_clipboard_calibration_results_complete(self):
         self.clipboard_clear()
         self.clipboard_append(self.clipboard_calibration_results_complete)