diff --git a/DiunaBI.UI.Shared/Extensions/ServiceCollectionExtensions.cs b/DiunaBI.UI.Shared/Extensions/ServiceCollectionExtensions.cs
index 22b1bdc..5aa82ba 100644
--- a/DiunaBI.UI.Shared/Extensions/ServiceCollectionExtensions.cs
+++ b/DiunaBI.UI.Shared/Extensions/ServiceCollectionExtensions.cs
@@ -45,6 +45,7 @@ public static class ServiceCollectionExtensions
         services.AddScoped<DataInboxService>();
         services.AddScoped<JobService>();
         services.AddScoped<DateTimeHelper>();
+        services.AddScoped<NumberFormatHelper>();
 
         // Filter state services (scoped to maintain state during user session)
         services.AddScoped<LayerFilterStateService>();
diff --git a/DiunaBI.UI.Shared/Pages/Layers/Details.razor b/DiunaBI.UI.Shared/Pages/Layers/Details.razor
index 48d9fd3..8594d43 100644
--- a/DiunaBI.UI.Shared/Pages/Layers/Details.razor
+++ b/DiunaBI.UI.Shared/Pages/Layers/Details.razor
@@ -165,12 +165,12 @@
                 <FooterContent>
                     @if (showSummary)
                     {
-                        <MudTd><b>@totalSum.ToString("N2")</b></MudTd>
+                        <MudTd><b>@NumberFormatHelper.FormatNumber(totalSum)</b></MudTd>
                         @foreach (var column in displayedColumns)
                         {
                             @if (column.StartsWith("Value") && columnSums.ContainsKey(column))
                             {
-                                <MudTd><b>@columnSums[column].ToString("N2")</b></MudTd>
+                                <MudTd><b>@NumberFormatHelper.FormatNumber(columnSums[column])</b></MudTd>
                             }
                             else
                             {
diff --git a/DiunaBI.UI.Shared/Pages/Layers/Details.razor.cs b/DiunaBI.UI.Shared/Pages/Layers/Details.razor.cs
index 127f8ec..83763a1 100644
--- a/DiunaBI.UI.Shared/Pages/Layers/Details.razor.cs
+++ b/DiunaBI.UI.Shared/Pages/Layers/Details.razor.cs
@@ -32,6 +32,9 @@ public partial class Details : ComponentBase, IDisposable
     [Inject]
     private DateTimeHelper DateTimeHelper { get; set; } = null!;
 
+    [Inject]
+    private NumberFormatHelper NumberFormatHelper { get; set; } = null!;
+
     private LayerDto? layer;
     private List<RecordDto> records = new();
     private List<string> displayedColumns = new();
@@ -191,7 +194,7 @@ public partial class Details : ComponentBase, IDisposable
         }
 
         var value = GetRecordValueByName(record, columnName);
-        return value.HasValue ? value.Value.ToString("N2") : string.Empty;
+        return NumberFormatHelper.FormatNumber(value);
     }
 
     private double? GetRecordValueByName(RecordDto record, string columnName)
diff --git a/DiunaBI.UI.Shared/Services/NumberFormatHelper.cs b/DiunaBI.UI.Shared/Services/NumberFormatHelper.cs
new file mode 100644
index 0000000..1aae194
--- /dev/null
+++ b/DiunaBI.UI.Shared/Services/NumberFormatHelper.cs
@@ -0,0 +1,50 @@
+using System.Globalization;
+
+namespace DiunaBI.UI.Shared.Services;
+
+public class NumberFormatHelper
+{
+    private readonly CultureInfo _culture;
+
+    public NumberFormatHelper()
+    {
+        // Always use Polish culture for number formatting
+        _culture = CultureInfo.GetCultureInfo("pl-PL");
+    }
+
+    public string FormatNumber(double? value, int decimals = 2)
+    {
+        if (!value.HasValue)
+            return string.Empty;
+
+        return value.Value.ToString($"N{decimals}", _culture);
+    }
+
+    public string FormatNumber(double value, int decimals = 2)
+    {
+        return value.ToString($"N{decimals}", _culture);
+    }
+
+    public string FormatInteger(double? value)
+    {
+        if (!value.HasValue)
+            return string.Empty;
+
+        return value.Value.ToString("N0", _culture);
+    }
+
+    public string FormatInteger(double value)
+    {
+        return value.ToString("N0", _culture);
+    }
+
+    public string GetCultureName()
+    {
+        return _culture.DisplayName;
+    }
+
+    public CultureInfo GetCulture()
+    {
+        return _culture;
+    }
+}