diff --git a/generate-custom-resolution-config.py b/generate-custom-resolution-config.py
new file mode 100755
index 0000000..9dd6770
--- /dev/null
+++ b/generate-custom-resolution-config.py
@@ -0,0 +1,110 @@
+#!/usr/bin/env python3
+"""This script generates new rofi config files for the given resolution
+
+The script looks at the directories 720p/ and 1080p/ and tries to generate a
+new directory "{resolution}p" where the numbers are adjusted. It does this by
+going through all files in the initial directories and scaling changed numbers
+linearly.
+For example: If a number is 2 for 720p, 3 for 1080p, and you generate for 1400p
+You will end up with 4 for 1440p.
+Likewise 5 (2+3) (720p) and 6 (3+3) (1080p) would yield 7 (4+3).
+"""
+from sys import stderr
+import re
+from argparse import ArgumentParser
+from os import walk
+from shutil import copytree
+import numpy as np
+
+number = re.compile(r"\d+(\.\d+)?")
+
+
+def scale_x_to_1440p(a, b):
+    m = np.array([[720, 1], [1080, 1]])
+    s = np.array([a, b])
+    x, y = np.linalg.solve(m, s)
+    c = x*1440 + y
+    return round(c, 2)
+
+
+def convert_lines(line_from, line_to):
+    start_ws = line_from.removesuffix(line_from.lstrip())
+    line_from_fields = line_from.split()
+    line_to_fields = line_to.split()
+    line_out_fields = []
+
+    for idx, field in enumerate(line_from_fields):
+        searched_num_in_from = re.search(number, field)
+        try:
+            searched_num_in_to = re.search(number, line_to_fields[idx])
+        except IndexError:
+            searched_num_in_to = None
+
+        if searched_num_in_from and searched_num_in_to:
+            num_in_from = searched_num_in_from.group()
+            num_in_to = searched_num_in_to.group()
+
+            # scale and replace if number differs
+            if num_in_from != num_in_to:
+                scaled_field = scale_x_to_1440p(float(num_in_from),
+                                                float(num_in_to))
+                field = field.replace(str(num_in_from), f"{scaled_field:g}")
+
+        line_out_fields.append(field)
+
+    line_out = " ".join(line_out_fields)
+    return f"{start_ws}{line_out}\n"
+
+
+def main(resolution):
+    scale_from = 720
+    scale_to = 1080
+
+    try:
+        copytree(f"{scale_from}p", f"{resolution}p")
+    except FileExistsError:
+        print(f"There is already a file or directory called \"{resolution}p\"."
+              "Please remove it before running the script!", file=stderr)
+        exit(1)
+
+    # loop over all files
+    for root, dirnames, filenames in walk(f"{scale_from}p"):
+        for filename in filenames:
+            # cut away basedir
+            filename = f"{root}/{filename}".removeprefix(f"{scale_from}p/")
+
+            # compare files
+            file_from = open(f"{scale_from}p/{filename}", "r")
+            file_to = open(f"{scale_to}p/{filename}", "r")
+
+            line_from = file_from.readline()
+            line_to = file_to.readline()
+            lines_new_resolution = ""
+
+            while line_from or line_to:
+                if line_from != line_to:
+                    lines_new_resolution += convert_lines(line_from, line_to)
+                else:
+                    lines_new_resolution += line_from
+
+                # go to next line
+                line_from = file_from.readline()
+                line_to = file_to.readline()
+
+            file_from.close()
+            file_to.close()
+
+            with open(f"{resolution}p/{filename}", "w") as file_out:
+                file_out.write(lines_new_resolution)
+
+
+if __name__ == "__main__":
+    parser = ArgumentParser()
+    parser.add_argument(
+        "resolution",
+        type=int,
+        help="Height of of your screens resolution, e.g. 1440 for 2560x1440",
+    )
+    args = parser.parse_args()
+
+    main(args.resolution)
diff --git a/setup.sh b/setup.sh
index 33ea3e8..eaa6518 100755
--- a/setup.sh
+++ b/setup.sh
@@ -36,16 +36,31 @@ install_themes() {
 	fi
 }
 
+# Clean up RES variable
+clean_up_RES() {
+	number_pattern='^[0-9]+p?$'
+	if [[ "${RES}" =~ ${number_pattern} ]]; then
+		RES="$(tr -d p <<<"$RES")p"
+	else
+		echo -e "Sorry, something went wrong when checking your" \
+			"custom resolution.\n"\
+			"Please enter the number of your resolution height" \
+			"in pixels, e.g. 1440."
+		exit 1
+	fi
+}
+
 # Main
 main() {
 	clear
 	cat <<- EOF
 		[*] Installing Rofi Themes...
-		
+
 		[*] Choose your screen resolution -
 		[1] 1920x1080
 		[2] 1366x768
-	
+		[3] Custom (Run ./generate-custom-resolution-config.py first)
+
 	EOF
 
 	read -p "[?] Select Option : "
@@ -58,6 +73,11 @@ main() {
 		RES='720p'
 		install_fonts
 		install_themes
+	elif [[ $REPLY == "3" ]]; then
+		read -p "How many pixes high is your resolution? " RES
+		clean_up_RES
+		install_fonts
+		install_themes
 	else
 		echo -e "\n[!] Invalid Option, Exiting...\n"
 		exit 1