diff --git a/Elwig/Documents/BusinessDocument.cs b/Elwig/Documents/BusinessDocument.cs
index a997e3a..2dac08f 100644
--- a/Elwig/Documents/BusinessDocument.cs
+++ b/Elwig/Documents/BusinessDocument.cs
@@ -1,6 +1,7 @@
 using Elwig.Helpers;
 using Elwig.Models.Entities;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 
 namespace Elwig.Documents {
@@ -36,7 +37,7 @@ namespace Elwig.Documents {
         }
 
         private static string GetColGroup(IEnumerable<double> cols) {
-            return "<colgroup>\n" + string.Join("\n", cols.Select(g => $"<col style=\"width: {g.ToString().Replace(',', '.')}mm;\"/>")) + "\n</colgroup>\n";
+            return "<colgroup>\n" + string.Join("\n", cols.Select(g => $"<col style=\"width: {g.ToString(CultureInfo.InvariantCulture)}mm;\"/>")) + "\n</colgroup>\n";
         }
 
         public static string PrintSortenaufteilung(Dictionary<string, MemberBucket> buckets) {
diff --git a/Elwig/Helpers/Export/Ods.cs b/Elwig/Helpers/Export/Ods.cs
index c1f1fa2..525d569 100644
--- a/Elwig/Helpers/Export/Ods.cs
+++ b/Elwig/Helpers/Export/Ods.cs
@@ -2,6 +2,7 @@
 using System;
 using System.Collections.Generic;
 using System.Data.Entity.Core.Common.CommandTrees.ExpressionBuilder;
+using System.Globalization;
 using System.IO;
 using System.IO.Compression;
 using System.Linq;
@@ -264,7 +265,7 @@ namespace Elwig.Helpers.Export {
             } else if (data is float || data is double || data is byte || data is char ||
                        data is short || data is ushort || data is int || data is uint || data is long || data is ulong) {
 
-                double v = double.Parse(data?.ToString() ?? "0");
+                double v = double.Parse(data?.ToString() ?? "0", CultureInfo.InvariantCulture);
                 if (units != null && units.Length > 0) {
                     int n = -1;
                     switch (units[0]) {
@@ -274,7 +275,7 @@ namespace Elwig.Helpers.Export {
                     }
                     if (n >= 0) add = string.Join(" ", add.Split(" ").Select(p => p.StartsWith("table:style-name=") ? $"table:style-name=\"N{n}\"" : p));
                 }
-                c = $"<{ct} office:value-type=\"float\" calcext:value-type=\"float\" office:value=\"{v.ToString()?.Replace(",", ".")}\"{add}><text:p>{data}</text:p></{ct}>";
+                c = $"<{ct} office:value-type=\"float\" calcext:value-type=\"float\" office:value=\"{v.ToString(CultureInfo.InvariantCulture)}\"{add}><text:p>{data}</text:p></{ct}>";
             } else {
                 c = $"<{ct} office:value-type=\"string\" calcext:value-type=\"string\"{add}><text:p>{data}</text:p></{ct}>";
             }
diff --git a/Elwig/Windows/DeliveryAdminWindow.xaml.cs b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
index 420981b..5b727d9 100644
--- a/Elwig/Windows/DeliveryAdminWindow.xaml.cs
+++ b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
@@ -8,6 +8,7 @@ using Microsoft.EntityFrameworkCore.ChangeTracking;
 using Microsoft.Win32;
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Threading.Tasks;
 using System.Windows;
@@ -391,8 +392,8 @@ namespace Elwig.Windows {
                         if (e.Length == 1) filter.RemoveAt(i--);
                     } else if (e.Length > 1 && Utils.FromToRegex.IsMatch(e)) {
                         var parts = e.Split("-");
-                        double? from = (parts[0].Length > 0) ? double.Parse(parts[0].Replace(".", ",")) : null;
-                        double? to = (parts[1].Length > 0) ? double.Parse(parts[1].Replace(".", ",")) : null;
+                        double? from = (parts[0].Length > 0) ? double.Parse(parts[0], CultureInfo.InvariantCulture) : null;
+                        double? to = (parts[1].Length > 0) ? double.Parse(parts[1], CultureInfo.InvariantCulture) : null;
                         switch ((from, to)) {
                             case ( <= 30, <= 30):
                             case ( <= 30, null):