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diff --git a/main.py b/main.py
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+++ b/main.py
@@ -0,0 +1,692 @@
+#!/usr/bin/env python3
+"""
+project: GarageCalc1
+file: main.py
+summary: Calculates available size of a garage space
+license: GPL
+author: Paul Salajean (p.salajean[at]gmx.de)
+"""
+
+# Standard library imports
+import sys
+import os
+import csv
+
+# Third party imports
+from PySide2.QtWidgets import QApplication, QMainWindow, QTableWidgetItem, QStatusBar, QAction, QFileDialog, \
+    QAbstractItemView, QMenu, QMessageBox
+from PySide2.QtGui import QIcon
+from PySide2.QtCore import QFile, QSize, Qt
+from PySide2.QtUiTools import QUiLoader
+
+# Local imports
+from utils import show_about
+
+# Local globals
+UI_FILE = "main.ui"
+APP_NAME = "Garagenraum-Rechner"
+APP_DISPNAME = "GarageCalc"
+APP_VERSION = "v0.1"
+APP_AUTHOR = "Paul Salajean"
+APP_DESCR = "Berechnet zur Verfügung stehenden Garagenraum"
+APP_COPYRIGHT = "(c) Paul Salajean 2021"
+APP_WEBSITE = "https://gitlab.com/ProfP303"
+APP_DESKTOPFILENAME = "GarageCalc"
+APP_ICON = "./img/icons8-garage-32.png"
+
+ICON_NEW = "./img/icons8-new-file-32.png"
+ICON_OPEN = "./img/icons8-opened-folder-32.png"
+ICON_SAVE = "./img/icons8-save-32.png"
+ICON_EXPORT = "./img/icons8-export-xls-32.png"
+ICON_ABOUT = "./img/icons8-information-32.png"
+ICON_QUIT = "./img/system-shutdown.png"
+
+COL_STUFF = 0
+COL_LENGTH = 1
+COL_WIDTH = 2
+COL_HEIGHT = 3
+COL_WEIGHT = 4
+
+STUFF_ROW_COUNT = 50
+
+class MyMainWindow(QMainWindow):
+    def __init__(self):
+        super().__init__()
+        self.load_ui()
+        self.init_ui()
+        self.set_defaults()
+        self.connect_signals()
+        self.create_actions()
+        self.create_toolbar()
+        self.create_statusbar()
+        self.statusBar.showMessage(f"{APP_NAME} {APP_VERSION} by {APP_AUTHOR}", 7000)
+        self.calc_voluminae()
+        self.ui.efWeight.setText(str("0"))
+        self.modified = False
+        self.opened_file = None
+
+    def load_ui(self):
+        loader = QUiLoader()
+        path = os.path.join(os.path.dirname(__file__), UI_FILE)
+        ui_file = QFile(path)
+        ui_file.open(QFile.ReadOnly)
+        self.ui = loader.load(ui_file, self)
+        ui_file.close()
+
+        # self.headers = self.ui.tableStuff.horizontalHeader()
+        self.headers = self.ui.tableStuff.verticalHeader()
+        self.headers.setContextMenuPolicy(Qt.CustomContextMenu)
+        self.headers.customContextMenuRequested.connect(self.show_rowheader_context_menu)
+        self.headers.setSelectionMode(QAbstractItemView.SingleSelection)
+
+    def create_actions(self):
+        self.actionNew = QAction()
+        self.actionNew.setIcon(QIcon(ICON_NEW))
+        self.actionNew.triggered.connect(self.file_new)
+        self.actionNew.setShortcut("Ctrl+N")
+        self.actionNew.setToolTip("Neu (Strg+N)")
+
+        self.actionOpen = QAction()
+        self.actionOpen.setIcon(QIcon(ICON_OPEN))
+        self.actionOpen.triggered.connect(self.file_open)
+        self.actionOpen.setShortcut("Ctrl+O")
+        self.actionOpen.setToolTip("Öffnen... (Strg+O)")
+
+        self.actionSave = QAction()
+        self.actionSave.setIcon(QIcon(ICON_SAVE))
+        self.actionSave.triggered.connect(self.file_save)
+        self.actionSave.setShortcut("Ctrl+S")
+        self.actionSave.setToolTip("Speichern (Strg+S)")
+
+        self.actionExport = QAction()
+        self.actionExport.setIcon(QIcon(ICON_EXPORT))
+        self.actionExport.triggered.connect(self.file_export)
+        self.actionExport.setToolTip("Export nach EXCEL...")
+
+        self.actionAbout = QAction()
+        self.actionAbout.setIcon(QIcon(ICON_ABOUT))
+        self.actionAbout.triggered.connect(show_about)
+        self.actionAbout.setToolTip("Informationen über das Programm")
+
+        self.actionQuit = QAction()
+        self.actionQuit.setIcon(QIcon(ICON_QUIT))
+        self.actionQuit.triggered.connect(QApplication.quit)
+        self.actionQuit.setShortcut("Ctrl+Q")
+        self.actionQuit.setToolTip("Programm beenden (Strg+Q)")
+
+    def create_toolbar(self):
+        # Main Toolbar (for all pages/views)
+        self.toolbar = self.addToolBar('Main Toolbar')
+        self.toolbar.setIconSize(QSize(32, 32))
+        self.toolbar.addAction(self.actionNew)
+        self.toolbar.addAction(self.actionOpen)
+        self.toolbar.addAction(self.actionSave)
+        self.toolbar.addSeparator()
+        self.toolbar.addAction(self.actionExport)
+        self.toolbar.addSeparator()
+        self.toolbar.addAction(self.actionAbout)
+        self.toolbar.addSeparator()
+        self.toolbar.addAction(self.actionQuit)
+
+    def set_defaults(self):
+        tblGarage = self.ui.tableGarage
+        tblStuff = self.ui.tableStuff
+
+        tblGarage.setItem(0, 0, QTableWidgetItem("6"))
+        tblGarage.setItem(0, 1, QTableWidgetItem("2.5"))
+        tblGarage.setItem(0, 2, QTableWidgetItem("2.5"))
+
+        tblStuff.setRowCount(STUFF_ROW_COUNT)
+
+        self.modified = False
+
+    def create_statusbar(self):
+        self.statusBar = QStatusBar()
+        self.setStatusBar(self.statusBar)
+
+    def connect_signals(self):
+        tblGarage = self.ui.tableGarage
+        tblStuff = self.ui.tableStuff
+        
+        tblGarage.itemChanged.connect(self.on_garage_changed)
+        tblStuff.itemChanged.connect(self.on_stuff_changed)
+
+    def show_rowheader_context_menu(self, position):
+        tblStuff = self.ui.tableStuff
+        row = self.headers.logicalIndexAt(position)
+        print("row click", row)
+
+        menu = QMenu()
+        remove_row = menu.addAction("Zeile entfernen")
+        insert_row = menu.addAction("Zeile einfügen")
+        ac = menu.exec_(tblStuff.mapToGlobal(position))
+        if ac == remove_row:
+            tblStuff.removeRow(row)
+            self.calc_voluminae()
+        elif ac == insert_row:
+            tblStuff.insertRow(row)
+
+    def init_ui(self):
+        tblGarage = self.ui.tableGarage
+        tblStuff = self.ui.tableStuff
+
+        # clear garage
+        # tblGarage.clear()
+        tblGarage.setRowCount(0)
+        tblGarage.setRowCount(1)
+        tblGarage.setVerticalHeaderLabels(["Garage"])
+
+        # clear stuff
+        # tblStuff.clear()
+        tblStuff.setRowCount(0)
+        tblStuff.setRowCount(STUFF_ROW_COUNT)
+
+        # clear results
+        self.ui.efVol_Garage.clear()
+        self.ui.efVol_Stuff.clear()
+        self.ui.efVol_Free.clear()
+        self.ui.efWeight.clear()
+
+        self.opened_file = None
+        if self.opened_file:
+            self.setWindowTitle(self.opened_file)
+        else:
+            self.setWindowTitle(f"{APP_NAME} {APP_VERSION} by {APP_AUTHOR}")
+
+        self.ui.efVol_Free.setStyleSheet("")
+        self.modified = False
+
+    def file_new(self):
+        if self.modified:
+            msg = "Es wurden bereits Einträge manuell geändert. Ohne Speichern sind alle Änderungen verloren. Trotzdem fortfahren?"
+            reply = QMessageBox.question(self, "Fortfahren?", msg, \
+            QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
+            if reply == QMessageBox.No:
+                return False
+        self.init_ui()
+
+    def file_save(self):
+        print("file_save() called.")
+        tblGarage = self.ui.tableGarage
+        tblStuff = self.ui.tableStuff
+
+        fileName = self.opened_file
+
+        if not self.opened_file:  # if not file already open
+            options = QFileDialog.Options()
+
+            sTxtFilesAll = "Alle Dateien"
+            sTxtFiles = "CSV-Datei"
+
+            fileName, _ = QFileDialog.getSaveFileName(None, "Speichern", None,
+                                                            sTxtFiles + " (*.csv);;" + sTxtFilesAll + " (*)",
+                                                            options=options)
+
+        with open(fileName, mode='w', newline='') as garagecalc_file:
+            writer = csv.writer(garagecalc_file, delimiter=';', quotechar='"', quoting=csv.QUOTE_MINIMAL)
+
+            garage_length = 0
+            garage_width = 0
+            garage_height = 0
+
+            item_length = tblGarage.item(0, 0)
+            item_width = tblGarage.item(0, 1)
+            item_height = tblGarage.item(0, 2)
+
+            # loop over table Garage
+            for row in range(tblGarage.rowCount()):
+                # get garage length
+                if item_length:
+                    garage_length = item_length.text()
+                    try:
+                        garage_length = float(garage_length)
+                    except ValueError:
+                        garage_length = 0.0
+
+                # get garage width
+                if item_width:
+                    garage_width = item_width.text()
+                    try:
+                        garage_width = float(garage_width)
+                    except ValueError:
+                        garage_width = 0.0
+
+                # get garage height
+                if item_height:
+                    garage_height = item_height.text()
+                    try:
+                        garage_height = float(garage_height)
+                    except ValueError:
+                        garage_height = 0.0
+
+                if garage_length or garage_width or garage_height:
+                    writer.writerow(["Garage", garage_length, garage_width, garage_height])
+
+            # loop over table Stuff
+            for row in range(tblStuff.rowCount()):
+                stuff_text = None
+                length = None
+                width = None
+                height = None
+                weight = None
+
+                item_stuff = tblStuff.item(row, COL_STUFF)
+                item_length = tblStuff.item(row, COL_LENGTH)
+                item_width = tblStuff.item(row, COL_WIDTH)
+                item_height = tblStuff.item(row, COL_HEIGHT)
+                item_weight = tblStuff.item(row, COL_WEIGHT)
+
+                if item_stuff:
+                    stuff_text = item_stuff.text()
+
+                if item_length:
+                    try:
+                        length = float(item_length.text())
+                    except ValueError:
+                        length = None
+
+                if item_width:
+                    try:
+                        width = float(item_width.text())
+                    except ValueError:
+                        width = None
+
+                if item_height:
+                    try:
+                        height = float(item_height.text())
+                    except ValueError:
+                        height = None
+
+                if item_weight:
+                    try:
+                        weight = float(item_weight.text())
+                    except ValueError:
+                        weight = None
+
+                if item_stuff or item_length or item_width or item_height or item_weight:
+                    writer.writerow([stuff_text, length, width, height, weight])
+
+        self.opened_file = os.path.basename(fileName)
+        self.setWindowTitle(self.opened_file)
+        self.modified = False
+
+    def file_open(self):
+        if self.modified:
+            msg = "Es wurden bereits Einträge manuell geändert. Ohne Speichern sind alle Änderungen verloren. Trotzdem fortfahren?"
+            reply = QMessageBox.question(self, "Fortfahren?", msg, \
+            QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
+            if reply == QMessageBox.No:
+                return False
+
+        tblGarage = self.ui.tableGarage
+        tblStuff = self.ui.tableStuff
+
+        options = QFileDialog.Options()
+
+        sTxtFilesAll = "Alle Dateien"
+        sTxtFiles = "CSV-Datei"
+
+        fileName, _ = QFileDialog.getOpenFileName(self, "Öffnen", None,
+                                                        sTxtFiles + " (*.csv);;" + sTxtFilesAll + " (*)",
+                                                        options=options)
+        if fileName:
+            self.init_ui()
+
+            file = open(fileName, "rU")
+            reader = csv.reader(file, delimiter=';')
+
+            row_idx = 0
+            for row in reader:
+                if row_idx == 0:  # first row (index=0) ist always garage dimension
+                    try:
+                        garage_length = row[1]
+                        garage_width = row[2]
+                        garage_height = row[3]
+                        print("garage_length", garage_length)
+                        print("garage_width", garage_width)
+                        print("garage_height", garage_height)
+
+                        tblGarage.setItem(0, COL_LENGTH-1, QTableWidgetItem(str(garage_length)))
+                        tblGarage.setItem(0, COL_WIDTH-1, QTableWidgetItem(str(garage_width)))
+                        tblGarage.setItem(0, COL_HEIGHT-1, QTableWidgetItem(str(garage_height)))
+
+                    except IndexError as ex:
+                        pass
+                print("")
+                if row_idx > 0:
+                    try:
+                        stuff = row[0]
+                        stuff_length = row[1]
+                        stuff_width = row[2]
+                        stuff_height = row[3]
+                        stuff_weight = row[4]
+                        print("stuff", stuff)
+                        print("length", stuff_length)
+                        print("width", stuff_width)
+                        print("height", stuff_height)
+                        print("weight", stuff_weight)
+
+                        tblStuff.setItem(row_idx - 1, COL_STUFF, QTableWidgetItem(stuff))
+                        tblStuff.setItem(row_idx - 1, COL_LENGTH, QTableWidgetItem(str(stuff_length)))
+                        tblStuff.setItem(row_idx - 1, COL_WIDTH, QTableWidgetItem(str(stuff_width)))
+                        tblStuff.setItem(row_idx - 1, COL_HEIGHT, QTableWidgetItem(str(stuff_height)))
+                        tblStuff.setItem(row_idx - 1, COL_WEIGHT, QTableWidgetItem(str(stuff_weight)))
+
+                    except IndexError as ex:
+                        pass
+
+                row_idx += 1
+
+            tblStuff.setRowCount(STUFF_ROW_COUNT)
+
+        self.modified = False
+        self.opened_file = os.path.basename(fileName)
+
+        if fileName:
+            self.setWindowTitle(self.opened_file)
+        else:
+            self.setWindowTitle(f"{APP_NAME} {APP_VERSION} by {APP_AUTHOR}")
+
+    def file_export(self):
+        tblGarage = self.ui.tableGarage
+        tblStuff = self.ui.tableStuff
+        options = QFileDialog.Options()
+        file_name, _ = QFileDialog.getSaveFileName(None, "Exportieren", None, "Excel-Datei (*.xlsx);;Alle Dateien (*)", options=options)
+        if file_name:
+            try:
+                import xlsxwriter
+            except ModuleNotFoundError:
+                print(f"[{__file__}] Module 'xlsxwriter' not found!")
+            else:
+                print(f"Exporting into file -> {file_name}")
+
+                workbook = xlsxwriter.Workbook(file_name)
+                worksheet = workbook.add_worksheet()
+
+                # write col header
+                start_row = 0
+                worksheet.write(start_row, 0, "Dimension der Garage")
+
+                start_row = 1
+                worksheet.write(start_row, COL_LENGTH, "Länge [m]")
+                worksheet.write(start_row, COL_WIDTH, "Breite [m]")
+                worksheet.write(start_row, COL_HEIGHT, "Höhe [m]")
+                worksheet.set_column(0, 0, 25)
+                worksheet.set_column(1, 3, 10)
+
+                start_row = 2
+                # loop over table Garage
+                for row in range(tblGarage.rowCount()):
+                    # get garage length
+                    garage_length = tblGarage.item(0, 0).text()
+                    try:
+                        garage_length = float(garage_length)
+                    except ValueError:
+                        garage_length = 0.0
+
+                    # get garage width
+                    garage_width = tblGarage.item(0, 1).text()
+                    try:
+                        garage_width = float(garage_width)
+                    except ValueError:
+                        garage_width = 0.0
+
+                    # get garage height
+                    garage_height = tblGarage.item(0, 2).text()
+                    try:
+                        garage_height = float(garage_height)
+                    except ValueError:
+                        garage_height = 0.0
+
+                    worksheet.write(start_row + row, COL_LENGTH, garage_length)
+                    worksheet.write(start_row + row, COL_WIDTH, garage_width)
+                    worksheet.write(start_row + row, COL_HEIGHT, garage_height)
+
+                start_row = 4
+                worksheet.write(start_row, 0, "Dimensionen der zu verstaueneden Gegenstände")
+
+                start_row = 5
+                worksheet.write(start_row, COL_LENGTH, "Länge [m]")
+                worksheet.write(start_row, COL_WIDTH, "Breite [m]")
+                worksheet.write(start_row, COL_HEIGHT, "Höhe [m]")
+                worksheet.write(start_row, COL_WEIGHT, "Gewicht [kg]")
+
+                start_row = 6
+                # loop over table Stuff
+                row_idx = start_row
+                for row in range(tblStuff.rowCount()):
+                    item_stuff = tblStuff.item(row, COL_STUFF)
+                    item_length = tblStuff.item(row, COL_LENGTH)
+                    item_width = tblStuff.item(row, COL_WIDTH)
+                    item_height = tblStuff.item(row, COL_HEIGHT)
+                    item_weight = tblStuff.item(row, COL_WEIGHT)
+
+                    if item_stuff:
+                        stuff_text = item_stuff.text()
+                        if len(stuff_text)>0:
+                            worksheet.write(start_row + row, COL_STUFF, stuff_text)
+
+                    if item_length:
+                        try:
+                            length = float(item_length.text())
+                            if length:
+                                worksheet.write(start_row + row, COL_LENGTH, length)
+                        except ValueError:
+                            pass
+
+                    if item_width:
+                        try:
+                            width = float(item_width.text())
+                            if width:
+                                worksheet.write(start_row + row, COL_WIDTH, width)
+                        except ValueError:
+                            pass
+
+                    if item_height:
+                        try:
+                            height = float(item_height.text())
+                            if height:
+                                worksheet.write(start_row + row, COL_HEIGHT, height)
+                        except ValueError:
+                            pass
+
+                    if item_weight:
+                        try:
+                            weight = float(item_weight.text())
+                            if weight:
+                                worksheet.write(start_row + row, COL_WEIGHT, weight)
+                        except ValueError:
+                            pass
+
+                    if item_stuff or item_length or item_width or item_height or item_weight:
+                        row_idx += 1
+
+                row_idx += 1
+                # loop over Results
+                worksheet.write(row_idx, 0, "Ergebnis")
+
+                row_idx += 1
+                worksheet.write(row_idx, 0, "Volumen der Garage:")
+                worksheet.write(row_idx, 1, float(self.ui.efVol_Garage.text()))
+
+                row_idx += 1
+                worksheet.write(row_idx, 0, "Volumen der Gegenstände:")
+                worksheet.write(row_idx, 1, float(self.ui.efVol_Stuff.text()))
+
+                row_idx += 1
+                worksheet.write(row_idx, 0, "Freier Raum")
+                worksheet.write(row_idx, 1, float(self.ui.efVol_Free.text()))
+
+                row_idx += 1
+                worksheet.write(row_idx, 0, "Gesamtgewicht")
+                worksheet.write(row_idx, 1, float(self.ui.efWeight.text()))
+
+                workbook.close()
+                self.statusBar.showMessage(f"Erfolgreich nach EXCEL exportiert.", 7000)
+
+    def on_garage_changed(self):
+        self.modified = True
+        self.calc_voluminae()
+
+    def on_stuff_changed(self):
+        self.modified = True
+        self.calc_voluminae()
+        self.calc_weight()
+
+    def get_garage_vol(self):
+        tblGarage = self.ui.tableGarage
+        is_error = False
+
+        garage_length = 0
+        garage_width = 0
+        garage_height = 0
+
+        # get garage length
+        if tblGarage.item(0, 0):
+            garage_length = tblGarage.item(0, 0).text()
+            if garage_length:
+                try:
+                    garage_length = float(garage_length)
+                except ValueError:
+                    garage_length = 0.0
+                    is_error = True
+
+        # get garage width
+        if tblGarage.item(0, 1):
+            garage_width = tblGarage.item(0, 1).text()
+            if garage_width:
+                try:
+                    garage_width = float(garage_width)
+                except ValueError:
+                    garage_width = 0.0
+                    is_error = True
+
+        # get garage height
+        if tblGarage.item(0, 2):
+            garage_height = tblGarage.item(0, 2).text()
+            if garage_height:
+                try:
+                    garage_height = float(garage_height)
+                except ValueError:
+                    garage_height = 0.0
+                    is_error = True
+
+        if not is_error:
+            garage_vol = garage_length * float(garage_width) * float(garage_height)
+        else:
+            garage_vol = 0.0
+            self.statusBar.showMessage("Fehler in der Garagen-Dimension. :-(", 7000)
+
+        return garage_vol
+
+    def get_stuff_vol(self):
+        tblStuff = self.ui.tableStuff
+        stuff_vol = 0
+        length = 0
+        width = 0
+        height = 0
+        # get number of rows
+        row_count = tblStuff.rowCount()
+
+        is_error = False
+
+        # get stuff voluminae
+        for row in range(row_count):
+            vol = 0
+            length = 0
+            width = 0
+            height = 0
+            item_length = tblStuff.item(row, COL_LENGTH)
+            item_width = tblStuff.item(row, COL_WIDTH)
+            item_height = tblStuff.item(row, COL_HEIGHT)
+
+            if item_length:
+                try:
+                    length = float(item_length.text())
+                except ValueError:
+                    length = 0
+                    is_error = True
+
+            if item_width:
+                try:
+                    width = float(item_width.text())
+                except ValueError:
+                    width = 0
+                    is_error = True
+
+            if item_height:
+                try:
+                    height = float(item_height.text())
+                except ValueError:
+                    height = 0
+                    is_error = True
+
+            vol = length * width * height
+
+            stuff_vol = stuff_vol + vol
+
+        if is_error:
+            stuff_vol = 0.0
+            self.statusBar.showMessage("Fehler in den Gegenstände-Dimensionen. :-(", 7000)
+
+        return stuff_vol
+
+    def calc_voluminae(self):
+        print("calc_voluminae() called.")
+        tblGarage = self.ui.tableGarage
+
+        # get garage vol
+        garage_vol = self.get_garage_vol()
+
+        # get stuff vol
+        stuff_vol = self.get_stuff_vol()
+
+        # display results
+        self.ui.efVol_Garage.setText(str(garage_vol))
+        self.ui.efVol_Stuff.setText(str(stuff_vol))
+        self.ui.efVol_Free.setText(str(garage_vol - stuff_vol))
+
+        if ( garage_vol - stuff_vol ) < 0:
+            self.ui.efVol_Free.setStyleSheet("border: 1px solid red;")
+        else:
+            self.ui.efVol_Free.setStyleSheet("")
+
+    def calc_weight(self):
+        tblStuff = self.ui.tableStuff
+        weight_sum = 0
+
+        # get number of rows
+        row_count = tblStuff.rowCount()
+
+        for row in range(row_count):
+            weight = 0.0
+            item = tblStuff.item(row, COL_WEIGHT)
+            if item:
+                try:
+                    weight = float(item.text())
+                except ValueError:
+                    weight = 0.0
+
+            weight_sum = weight_sum + weight
+
+        self.ui.efWeight.setText(str(weight_sum))
+
+
+if __name__ == "__main__":
+    qApp = QApplication([])
+
+    qApp.setApplicationName(APP_NAME)
+    qApp.setApplicationDisplayName(APP_DISPNAME)
+    qApp.setApplicationVersion(APP_VERSION)
+    qApp.description = APP_DESCR
+    qApp.copyright = APP_COPYRIGHT
+    qApp.website = APP_WEBSITE
+    qApp.setWindowIcon(QIcon(APP_ICON))
+    qApp.setDesktopFileName(APP_DESKTOPFILENAME)
+
+    winMain = MyMainWindow()
+    # winMain.resize(600, 600)
+    winMain.setFixedWidth(600)
+    winMain.setFixedHeight(620)
+    winMain.show()
+    sys.exit(qApp.exec_())
diff --git a/main.ui b/main.ui
new file mode 100644
index 0000000..c8bdd36
--- /dev/null
+++ b/main.ui
@@ -0,0 +1,334 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Form</class>
+ <widget class="QWidget" name="Form">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>604</width>
+    <height>596</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <widget class="QGroupBox" name="gbResults">
+   <property name="geometry">
+    <rect>
+     <x>20</x>
+     <y>440</y>
+     <width>541</width>
+     <height>121</height>
+    </rect>
+   </property>
+   <property name="title">
+    <string>Ergebnis</string>
+   </property>
+   <property name="flat">
+    <bool>true</bool>
+   </property>
+   <widget class="QLabel" name="lblVol_Garage">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>20</y>
+      <width>140</width>
+      <height>16</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>Volumen der Garage:</string>
+    </property>
+   </widget>
+   <widget class="QLabel" name="lblVol_Stuff">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>40</y>
+      <width>140</width>
+      <height>16</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>Volumen der Gegenstände:</string>
+    </property>
+   </widget>
+   <widget class="QLabel" name="lblVol_Free">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>60</y>
+      <width>140</width>
+      <height>16</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>Freier Raum i. d. Garage:</string>
+    </property>
+   </widget>
+   <widget class="QLineEdit" name="efVol_Garage">
+    <property name="geometry">
+     <rect>
+      <x>174</x>
+      <y>20</y>
+      <width>113</width>
+      <height>20</height>
+     </rect>
+    </property>
+    <property name="alignment">
+     <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+    </property>
+    <property name="readOnly">
+     <bool>true</bool>
+    </property>
+   </widget>
+   <widget class="QLineEdit" name="efVol_Stuff">
+    <property name="geometry">
+     <rect>
+      <x>174</x>
+      <y>40</y>
+      <width>113</width>
+      <height>20</height>
+     </rect>
+    </property>
+    <property name="alignment">
+     <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+    </property>
+    <property name="readOnly">
+     <bool>true</bool>
+    </property>
+   </widget>
+   <widget class="QLineEdit" name="efVol_Free">
+    <property name="geometry">
+     <rect>
+      <x>174</x>
+      <y>60</y>
+      <width>113</width>
+      <height>20</height>
+     </rect>
+    </property>
+    <property name="alignment">
+     <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+    </property>
+    <property name="readOnly">
+     <bool>true</bool>
+    </property>
+   </widget>
+   <widget class="QLabel" name="lblM3">
+    <property name="geometry">
+     <rect>
+      <x>294</x>
+      <y>20</y>
+      <width>47</width>
+      <height>13</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>m³</string>
+    </property>
+   </widget>
+   <widget class="QLabel" name="lblM3_2">
+    <property name="geometry">
+     <rect>
+      <x>294</x>
+      <y>40</y>
+      <width>47</width>
+      <height>13</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>m³</string>
+    </property>
+   </widget>
+   <widget class="QLabel" name="lblM3_3">
+    <property name="geometry">
+     <rect>
+      <x>294</x>
+      <y>60</y>
+      <width>47</width>
+      <height>13</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>m³</string>
+    </property>
+   </widget>
+   <widget class="QLineEdit" name="efWeight">
+    <property name="geometry">
+     <rect>
+      <x>174</x>
+      <y>80</y>
+      <width>113</width>
+      <height>20</height>
+     </rect>
+    </property>
+    <property name="alignment">
+     <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+    </property>
+    <property name="readOnly">
+     <bool>true</bool>
+    </property>
+   </widget>
+   <widget class="QLabel" name="lblM3_4">
+    <property name="geometry">
+     <rect>
+      <x>294</x>
+      <y>80</y>
+      <width>47</width>
+      <height>13</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>kg</string>
+    </property>
+   </widget>
+   <widget class="QLabel" name="lblVol_Free_2">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>80</y>
+      <width>140</width>
+      <height>16</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>Gesamtgewicht:</string>
+    </property>
+   </widget>
+  </widget>
+  <widget class="QGroupBox" name="gbStuff">
+   <property name="geometry">
+    <rect>
+     <x>20</x>
+     <y>120</y>
+     <width>561</width>
+     <height>301</height>
+    </rect>
+   </property>
+   <property name="title">
+    <string>Dimensionen der zu verstauenden Gegenstände</string>
+   </property>
+   <property name="flat">
+    <bool>true</bool>
+   </property>
+   <layout class="QVBoxLayout" name="verticalLayout">
+    <item>
+     <widget class="QTableWidget" name="tableStuff">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <property name="alternatingRowColors">
+       <bool>true</bool>
+      </property>
+      <property name="selectionMode">
+       <enum>QAbstractItemView::NoSelection</enum>
+      </property>
+      <column>
+       <property name="text">
+        <string>Gegenstand</string>
+       </property>
+      </column>
+      <column>
+       <property name="text">
+        <string>Länge [m]</string>
+       </property>
+      </column>
+      <column>
+       <property name="text">
+        <string>Breite [m]</string>
+       </property>
+      </column>
+      <column>
+       <property name="text">
+        <string>Höhe [m]</string>
+       </property>
+      </column>
+      <column>
+       <property name="text">
+        <string>Gewicht [kg]</string>
+       </property>
+      </column>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QGroupBox" name="gbGarage">
+   <property name="geometry">
+    <rect>
+     <x>20</x>
+     <y>20</y>
+     <width>561</width>
+     <height>91</height>
+    </rect>
+   </property>
+   <property name="minimumSize">
+    <size>
+     <width>0</width>
+     <height>91</height>
+    </size>
+   </property>
+   <property name="title">
+    <string>Dimension der Garage</string>
+   </property>
+   <property name="flat">
+    <bool>true</bool>
+   </property>
+   <widget class="QTableWidget" name="tableGarage">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>23</y>
+      <width>351</width>
+      <height>58</height>
+     </rect>
+    </property>
+    <property name="sizePolicy">
+     <sizepolicy hsizetype="Preferred" vsizetype="Minimum">
+      <horstretch>0</horstretch>
+      <verstretch>0</verstretch>
+     </sizepolicy>
+    </property>
+    <property name="minimumSize">
+     <size>
+      <width>0</width>
+      <height>58</height>
+     </size>
+    </property>
+    <row>
+     <property name="text">
+      <string>Garage</string>
+     </property>
+    </row>
+    <column>
+     <property name="text">
+      <string>Länge [m]</string>
+     </property>
+    </column>
+    <column>
+     <property name="text">
+      <string>Breite [m]</string>
+     </property>
+    </column>
+    <column>
+     <property name="text">
+      <string>Höhe [m]</string>
+     </property>
+    </column>
+   </widget>
+  </widget>
+ </widget>
+ <tabstops>
+  <tabstop>tableGarage</tabstop>
+  <tabstop>tableStuff</tabstop>
+  <tabstop>efVol_Garage</tabstop>
+  <tabstop>efVol_Stuff</tabstop>
+  <tabstop>efVol_Free</tabstop>
+  <tabstop>efWeight</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/utils.py b/utils.py
new file mode 100644
index 0000000..f58f05f
--- /dev/null
+++ b/utils.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+"""
+project: GarageCalc1
+file: utils.py
+summary: helper functions
+"""
+
+# Standard library imports
+import sys
+import os
+
+# Third party imports
+from PySide2.QtWidgets import QMessageBox, QApplication, QMainWindow, QTableWidgetItem, QStatusBar, QAction
+from PySide2 import QtCore
+from PySide2.QtGui import QIcon, QPixmap
+from PySide2.QtCore import QFile, QSize
+from PySide2.QtUiTools import QUiLoader
+
+# local globals
+APP_ICON = "icons8-garage-32.png"
+
+def show_about():
+    msg = QMessageBox()
+    msg.setIconPixmap(QPixmap(APP_ICON))
+
+    text = "<p align='center'><h1>" + qApp.applicationDisplayName() + " " + \
+        "<br>" + qApp.applicationVersion() + "</h1>" + \
+        "<br>" + qApp.applicationName() + "<br>" + \
+        "<br>" + qApp.description + "<br>" + \
+        "<br>" + "Idee von: Balazs Fabian" + "<br>" + \
+        "<br>" + qApp.copyright + "<br>" \
+        "<br> <a href='" + qApp.website + "'>" + qApp.website + "</a></p>"
+
+    text = text + "<p align='center'>Used icons: Theme 'Cute Color' from <a href='https://icons8.com/'>Icons8</a></p>"
+    text = text + "<p align='center'>Python version: " + f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro} {sys.version_info.releaselevel}"
+    text = text + "<br>" + f"{sys.executable}" + "<br>"
+    text = text + "<br>Qt version: " + f"{QtCore.__version__}"
+
+    msg.setText(text)
+    msg.setWindowTitle("About")
+    msg.setStandardButtons(QMessageBox.Ok)
+
+    msg.exec_()