diff --git a/README.md b/README.md
index 3328916f..bae50995 100644
--- a/README.md
+++ b/README.md
@@ -1073,7 +1073,18 @@ public class Dto
 }
 ```
 
-#### 4. Multiple column names mapping to the same property.
+#### 4. Set Column Visibility(MiniExcelHiddenAttribute)
+```csharp
+public class Dto
+{
+    public string Name { get; set; }
+
+    [ExcelHidden]
+    public int SecretPoints { get; set; }    
+}
+```
+
+#### 5. Multiple column names mapping to the same property.
 
 ```csharp
 public class Dto
@@ -1084,9 +1095,7 @@ public class Dto
 }
 ```
 
-
-
-#### 5. System.ComponentModel.DisplayNameAttribute = ExcelColumnName.excelColumnNameAttribute
+#### 6. System.ComponentModel.DisplayNameAttribute = ExcelColumnName.excelColumnNameAttribute
 
 Since 1.24.0, system supports System.ComponentModel.DisplayNameAttribute = ExcelColumnName.excelColumnNameAttribute
 
@@ -1102,9 +1111,7 @@ public class TestIssueI4TXGTDto
 }
 ```
 
-
-
-#### 6. ExcelColumnAttribute
+#### 7. ExcelColumnAttribute
 
 Since V1.26.0, multiple attributes can be simplified like :
 ```csharp
@@ -1114,12 +1121,12 @@ Since V1.26.0, multiple attributes can be simplified like :
             public string MyProperty { get; set; }
             [ExcelColumn(Name = "CreateDate", Index = 1,Format ="yyyy-MM",Width =100)]
             public DateTime MyProperty2 { get; set; }
+            [ExcelColumn(Name = "SecretColumn", Hidden = true)]
+            public int MyProperty3 { get; set; }
         }
 ```
 
-
-
-#### 7. DynamicColumnAttribute
+#### 8. DynamicColumnAttribute
 
 Since V1.26.0, we can set the attributes of Column dynamically
 ```csharp
@@ -1138,7 +1145,7 @@ Since V1.26.0, we can set the attributes of Column dynamically
 ```
 ![image](https://user-images.githubusercontent.com/12729184/164510353-5aecbc4e-c3ce-41e8-b6cf-afd55eb23b68.png)
 
-#### 8. DynamicSheetAttribute
+#### 9. DynamicSheetAttribute
 
 Since V1.31.4 we can set the attributes of Sheet dynamically. We can set sheet name and state (visibility).
 ```csharp
diff --git a/src/MiniExcel/Attributes/ExcelColumnAttribute.cs b/src/MiniExcel/Attributes/ExcelColumnAttribute.cs
index 36211b8f..70d0c203 100644
--- a/src/MiniExcel/Attributes/ExcelColumnAttribute.cs
+++ b/src/MiniExcel/Attributes/ExcelColumnAttribute.cs
@@ -13,8 +13,9 @@ public class ExcelColumnAttribute : Attribute
 
         public string Name { get; set; }
         public string[] Aliases { get; set; }
-        public double Width { get; set; } = 9.28515625;
+        public double Width { get; set; } = 8.42857143;
         public string Format { get; set; }
+        public bool Hidden { get; set; }
         public bool Ignore { get; set; }
         public ColumnType Type { get; set; } = ColumnType.Value;
 
diff --git a/src/MiniExcel/Attributes/ExcelHiddenAttribute.cs b/src/MiniExcel/Attributes/ExcelHiddenAttribute.cs
new file mode 100644
index 00000000..fcda446a
--- /dev/null
+++ b/src/MiniExcel/Attributes/ExcelHiddenAttribute.cs
@@ -0,0 +1,11 @@
+using System;
+
+namespace MiniExcelLibs.Attributes
+{
+    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field)]
+    public class ExcelHiddenAttribute : Attribute
+    {
+        public bool ExcelHidden { get; set; }
+        public ExcelHiddenAttribute(bool excelHidden = true) => ExcelHidden = excelHidden;
+    }
+}
diff --git a/src/MiniExcel/MiniExcelLibs.csproj b/src/MiniExcel/MiniExcelLibs.csproj
index 9b960d12..e3642133 100644
--- a/src/MiniExcel/MiniExcelLibs.csproj
+++ b/src/MiniExcel/MiniExcelLibs.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 	<PropertyGroup>
 		<TargetFrameworks>net45;netstandard2.0;net8.0;net9.0;net10.0</TargetFrameworks>
-		<Version>1.42.0</Version>
+		<Version>1.43.0</Version>
 	</PropertyGroup>
 	<PropertyGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
 		<LangVersion>8</LangVersion>
diff --git a/src/MiniExcel/OpenXml/Constants/WorksheetXml.cs b/src/MiniExcel/OpenXml/Constants/WorksheetXml.cs
index 50cdcbc7..37ece9d3 100644
--- a/src/MiniExcel/OpenXml/Constants/WorksheetXml.cs
+++ b/src/MiniExcel/OpenXml/Constants/WorksheetXml.cs
@@ -16,8 +16,8 @@ internal static class WorksheetXml
         internal const string StartSheetViews = "<x:sheetViews>";
         internal const string EndSheetViews = "</x:sheetViews>";
 
-        internal static string StartSheetView( int tabSelected=0, int workbookViewId=0 )
-            => $"<x:sheetView tabSelected=\"{tabSelected}\" workbookViewId=\"{workbookViewId}\">";
+        internal static string StartSheetView(int tabSelected = 0, int workbookViewId = 0, bool rightToLeft = false)
+            => $"<x:sheetView tabSelected=\"{tabSelected}\" workbookViewId=\"{workbookViewId}\" rightToLeft=\"{(rightToLeft ? 1 : 0)}\">";
         internal const string EndSheetView = "</x:sheetView>";
 
         internal const string StartSheetData = "<x:sheetData>";
@@ -45,10 +45,10 @@ internal static string PaneSelection( string pane, string activeCell, string sqr
         internal const string EndRow = "</x:row>";
         internal const string StartCols = "<x:cols>";
         
-        internal static string Column(int colIndex, double columnWidth)
-            => $@"<x:col min=""{colIndex}"" max=""{colIndex}"" width=""{columnWidth.ToString(CultureInfo.InvariantCulture)}"" customWidth=""1"" />";
+        internal static string Column(int colIndex, double columnWidth, bool hidden = false)
+            => $@"<x:col min=""{colIndex}"" max=""{colIndex}"" width=""{columnWidth.ToString(CultureInfo.InvariantCulture)}"" hidden=""{(hidden ? 1 : 0)}"" customWidth=""1"" />";
         
-        private static readonly int _maxColumnLength = Column(int.MaxValue, double.MaxValue).Length;
+        private static readonly int _maxColumnLength = Column(int.MaxValue, double.MaxValue, true).Length;
 
         public static int GetColumnPlaceholderLength(int columnCount) 
             => StartCols.Length + (_maxColumnLength * columnCount) + EndCols.Length;
diff --git a/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.Async.cs b/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.Async.cs
index b86c0173..049e2e46 100644
--- a/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.Async.cs
+++ b/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.Async.cs
@@ -229,11 +229,11 @@ private async Task<int> WriteValuesAsync(MiniExcelAsyncStreamWriter writer, obje
                 if (_configuration.EnableAutoWidth)
                 {
                     columnWidthsPlaceholderPosition = await WriteColumnWidthPlaceholdersAsync(writer, props);
-                    widths = new ExcelWidthCollection(_configuration.MinWidth, _configuration.MaxWidth, props);
+                    widths = ExcelWidthCollection.FromProps(props, _configuration.MinWidth, _configuration.MaxWidth);
                 }
                 else
                 {
-                    await WriteColumnsWidthsAsync(writer, ExcelColumnWidth.FromProps(props), cancellationToken);
+                    await WriteColumnsWidthsAsync(writer, ExcelWidthCollection.FromProps(props), cancellationToken);
                 }
 
                 //header
@@ -351,7 +351,7 @@ private static async Task WriteColumnsWidthsAsync(MiniExcelAsyncStreamWriter wri
                     await writer.WriteAsync(WorksheetXml.StartCols);
                     hasWrittenStart = true;
                 }
-                await writer.WriteAsync(WorksheetXml.Column(column.Index, column.Width));
+                await writer.WriteAsync(WorksheetXml.Column(column.Index, column.Width, column.Hidden));
             }
             
             if (!hasWrittenStart)
diff --git a/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.DefaultOpenXml.cs b/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.DefaultOpenXml.cs
index 639c50e2..da5b2ef1 100644
--- a/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.DefaultOpenXml.cs
+++ b/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.DefaultOpenXml.cs
@@ -80,14 +80,14 @@ private ExcellSheetInfo GetSheetInfos(string sheetName)
         private string GetSheetViews()
         {
             // exit early if no style to write
-            if (_configuration.FreezeRowCount <= 0 && _configuration.FreezeColumnCount <= 0)
+            if (_configuration.FreezeRowCount <= 0 && _configuration.FreezeColumnCount <= 0 && !_configuration.RightToLeft)
                 return string.Empty;
 
             var sb = new StringBuilder();
 
             // start sheetViews
             sb.Append(WorksheetXml.StartSheetViews);
-            sb.Append(WorksheetXml.StartSheetView());
+            sb.Append(WorksheetXml.StartSheetView(rightToLeft: _configuration.RightToLeft));
 
             // Write panes
             sb.Append(GetPanes());
diff --git a/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.cs b/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.cs
index 7f069f55..a0c96e2d 100644
--- a/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.cs
+++ b/src/MiniExcel/OpenXml/ExcelOpenXmlSheetWriter.cs
@@ -221,11 +221,11 @@ private int WriteValues(MiniExcelStreamWriter writer, object values)
             if (_configuration.EnableAutoWidth)
             {
                 columnWidthsPlaceholderPosition = WriteColumnWidthPlaceholders(writer, maxColumnIndex);
-                widths = new ExcelWidthCollection(_configuration.MinWidth, _configuration.MaxWidth, props);
+                widths = ExcelWidthCollection.FromProps(props, _configuration.MinWidth, _configuration.MaxWidth);
             }
             else
             {
-                WriteColumnsWidths(writer, ExcelColumnWidth.FromProps(props));
+                WriteColumnsWidths(writer, ExcelWidthCollection.FromProps(props));
             }
 
             //header
@@ -299,7 +299,7 @@ private static void WriteColumnsWidths(MiniExcelStreamWriter writer, IEnumerable
                     writer.Write(WorksheetXml.StartCols);
                     hasWrittenStart = true;
                 }
-                writer.Write(WorksheetXml.Column(column.Index, column.Width));
+                writer.Write(WorksheetXml.Column(column.Index, column.Width, column.Hidden));
             }
 
             if (hasWrittenStart)
diff --git a/src/MiniExcel/OpenXml/ExcelWidthCollection.cs b/src/MiniExcel/OpenXml/ExcelWidthCollection.cs
index 494c1ade..ee74e584 100644
--- a/src/MiniExcel/OpenXml/ExcelWidthCollection.cs
+++ b/src/MiniExcel/OpenXml/ExcelWidthCollection.cs
@@ -1,71 +1,81 @@
 using MiniExcelLibs.Utils;
 using System;
+using System.Collections;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 
 namespace MiniExcelLibs.OpenXml
 {
     public sealed class ExcelColumnWidth
     {
+        // Aptos is the default font for Office 2023 and onwards, over which the width of cells are calculated at the size of 11pt.
+        // Priorly it was Calibri, which had very similar parameters, so no visual differences should be noticed.
+        private const double DefaultCellPadding = 5;
+        private const double Aptos11MaxDigitWidth = 7;
+        public const double Aptos11Padding = DefaultCellPadding /  Aptos11MaxDigitWidth;
+        
         public int Index { get; set; }
         public double Width { get; set; }
+        public bool Hidden { get; set; }
+        
+        public static double GetWidthFromTextLength(double characters)
+            => Math.Round(characters + Aptos11Padding, 8);
+    }
+
+    public sealed class ExcelWidthCollection : IReadOnlyCollection<ExcelColumnWidth>
+    {
+        private readonly Dictionary<int, ExcelColumnWidth> _columnWidths;
+        private readonly double _maxWidth;
+
+        public IReadOnlyCollection<ExcelColumnWidth> Columns
+#if NET45
+            => _columnWidths.Values.ToList();
+#else
+            => _columnWidths.Values;
+#endif
 
-        internal static IEnumerable<ExcelColumnWidth> FromProps(ICollection<ExcelColumnInfo> props, double? minWidth = null)
+        private ExcelWidthCollection(ICollection<ExcelColumnWidth> columnWidths, double maxWidth)
+        {
+            _maxWidth = ExcelColumnWidth.GetWidthFromTextLength(maxWidth);
+            _columnWidths = columnWidths.ToDictionary(x => x.Index);
+        }
+
+        internal static ExcelWidthCollection FromProps(ICollection<ExcelColumnInfo> mappings, double? minWidth = null, double maxWidth = 200)
         {
             var i = 1;
-            foreach (var p in props)
+            var columnWidths = new List<ExcelColumnWidth>();
+
+            foreach (var map in mappings)
             {
-                if (p?.ExcelColumnWidth != null || minWidth != null)
+                if ((map?.ExcelHidden ?? false) || map?.ExcelColumnWidth != null || minWidth != null)
                 {
-                    var colIndex = p?.ExcelColumnIndex + 1;
-                    yield return new ExcelColumnWidth
-                    {
-                        Index = colIndex ?? i,
-                        Width = p?.ExcelColumnWidth ?? minWidth.Value
-                    };
+                    var colIndex = map?.ExcelColumnIndex + 1 ?? i;
+                    var hidden = map?.ExcelHidden ?? false;
+                    var width = map?.ExcelColumnWidth ?? minWidth ?? 8.42857143;
+
+                    columnWidths.Add(new ExcelColumnWidth { Index = colIndex, Width = width + ExcelColumnWidth.Aptos11Padding, Hidden = hidden});
                 }
 
                 i++;
             }
-        }
-    }
-
-    public sealed class ExcelWidthCollection
-    {
-        private readonly Dictionary<int, ExcelColumnWidth> _columnWidths;
-        private readonly double _maxWidth;
-
-        public IEnumerable<ExcelColumnWidth> Columns => _columnWidths.Values;
 
-        internal ExcelWidthCollection(double minWidth, double maxWidth, ICollection<ExcelColumnInfo> props)
-        {
-            _maxWidth = maxWidth;
-            _columnWidths = ExcelColumnWidth.FromProps(props, minWidth).ToDictionary(x => x.Index);
+            return new ExcelWidthCollection(columnWidths, maxWidth);
         }
 
-        public void AdjustWidth(int columnIndex, string columnValue)
+        internal void AdjustWidth(int columnIndex, string columnValue)
         {
-            if (!string.IsNullOrEmpty(columnValue) 
-                && _columnWidths.TryGetValue(columnIndex, out var currentWidth))
+            if (!string.IsNullOrEmpty(columnValue) && _columnWidths.TryGetValue(columnIndex, out var currentWidth))
             {
-                var adjustedWidth = Math.Max(currentWidth.Width, GetApproximateTextWidth(columnValue.Length));
+                var desiredWidth = ExcelColumnWidth.GetWidthFromTextLength(columnValue.Length);
+                var adjustedWidth = Math.Max(currentWidth.Width, desiredWidth);
                 currentWidth.Width = Math.Min(_maxWidth, adjustedWidth);
             }
         }
 
-        /// <summary>
-        /// Get the approximate width of the given text for Calibri 11pt
-        /// </summary>
-        /// <remarks>
-        /// Rounds the result to 2 decimal places.
-        /// </remarks>
-        public static double GetApproximateTextWidth(int textLength)
-        {
-            const double characterWidthFactor = 1.2;  // Estimated factor for Calibri, 11pt
-            const double padding = 2;  // Add some padding for extra spacing
+        public IEnumerator<ExcelColumnWidth> GetEnumerator() => _columnWidths.Values.GetEnumerator();
+        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
 
-            var excelColumnWidth = (textLength * characterWidthFactor) + padding;
-            return Math.Round(excelColumnWidth, 2);
-        }
+        public int Count =>  _columnWidths.Count;
     }
 }
diff --git a/src/MiniExcel/OpenXml/OpenXmlConfiguration.cs b/src/MiniExcel/OpenXml/OpenXmlConfiguration.cs
index 898fff07..18355809 100644
--- a/src/MiniExcel/OpenXml/OpenXmlConfiguration.cs
+++ b/src/MiniExcel/OpenXml/OpenXmlConfiguration.cs
@@ -9,6 +9,7 @@ public class OpenXmlConfiguration : Configuration
         public bool FillMergedCells { get; set; }
         public TableStyles TableStyles { get; set; } = TableStyles.Default;
         public bool AutoFilter { get; set; } = true;
+        public bool RightToLeft { get; set; } = false;
         public int FreezeRowCount { get; set; } = 1;
         public int FreezeColumnCount { get; set; } = 0;
         public bool EnableConvertByteArray { get; set; } = true;
@@ -34,7 +35,7 @@ public class OpenXmlConfiguration : Configuration
         /// </summary>
         public bool EnableAutoWidth { get; set; }
 
-        public double MinWidth { get; set; } = 9.28515625;
+        public double MinWidth { get; set; } = 8.42857143;
 
         public double MaxWidth { get; set; } = 200;
     }
diff --git a/src/MiniExcel/SaveByTemplate/ExcelOpenXmlTemplate.Impl.cs b/src/MiniExcel/SaveByTemplate/ExcelOpenXmlTemplate.Impl.cs
index dc6da1d7..5d86359e 100644
--- a/src/MiniExcel/SaveByTemplate/ExcelOpenXmlTemplate.Impl.cs
+++ b/src/MiniExcel/SaveByTemplate/ExcelOpenXmlTemplate.Impl.cs
@@ -106,6 +106,8 @@ public string ToXmlString(string prefix)
             => $"<{prefix}mergeCell ref=\"{ColumnHelper.GetAlphabetColumnName(X1)}{Y1}:{ColumnHelper.GetAlphabetColumnName(X2)}{Y2}\"/>";
     }
 
+    internal enum SpecialCellType { None, Group, Endgroup, Merge, Header }
+    
     internal class MergeCellIndex
     {
         public int RowStart { get; set; }
@@ -378,7 +380,31 @@ private void WriteSheetXml(Stream outputFileStream, XmlDocument doc, XmlNode she
                     var rowInfo = _xRowInfos[rowNo];
                     var row = rowInfo.Row;
 
-                    if (row.InnerText.Contains("@group"))
+                    SpecialCellType specialCellType = SpecialCellType.None;
+                    foreach (XmlNode c in row.GetElementsByTagName("c"))
+                    {
+                        switch (c.InnerText)
+                        {
+                            case "@group":
+                                specialCellType = SpecialCellType.Group;
+                                break;
+                            case "@endgroup":
+                                specialCellType = SpecialCellType.Endgroup;
+                                break;
+                            case "@merge":
+                            case "@endmerge":
+                                specialCellType = SpecialCellType.Merge;
+                                break;
+                            case var s when s.StartsWith("@header"):
+                                specialCellType = SpecialCellType.Header;
+                                break;
+                        }
+
+                        if (specialCellType != SpecialCellType.None)
+                            break;
+                    }
+                    
+                    if (specialCellType == SpecialCellType.Group)
                     {
                         groupingStarted = true;
                         hasEverGroupStarted = true;
@@ -387,7 +413,7 @@ private void WriteSheetXml(Stream outputFileStream, XmlDocument doc, XmlNode she
                         prevHeader = "";
                         continue;
                     }
-                    else if (row.InnerText.Contains("@endgroup"))
+                    else if (specialCellType == SpecialCellType.Endgroup)
                     {
                         if (cellIEnumerableValuesIndex >= cellIEnumerableValues.Count - 1)
                         {
@@ -404,23 +430,19 @@ private void WriteSheetXml(Stream outputFileStream, XmlDocument doc, XmlNode she
                         isFirstRound = false;
                         continue;
                     }
-                    else if (row.InnerText.Contains("@header"))
+                    else if (specialCellType == SpecialCellType.Header)
                     {
                         isHeaderRow = true;
                     }
-                    else if (mergeCells)
+                    else if (specialCellType == SpecialCellType.Merge)
                     {
-                        if (row.InnerText.Contains("@merge") || row.InnerText.Contains("@endmerge"))
-                        {
-                            mergeRowCount++;
-                            continue;
-                        }
+                        mergeRowCount++;
+                        continue;
                     }
 
                     if (groupingStarted && !isCellIEnumerableValuesSet)
                     {
-                        cellIEnumerableValues = rowInfo.CellIlListValues
-                            ?? rowInfo.CellIEnumerableValues.Cast<object>().ToList();
+                        cellIEnumerableValues = rowInfo.CellIlListValues ?? rowInfo.CellIEnumerableValues.Cast<object>().ToList();
                         isCellIEnumerableValuesSet = true;
                     }
 
diff --git a/src/MiniExcel/Utils/CustomPropertyHelper.cs b/src/MiniExcel/Utils/CustomPropertyHelper.cs
index d8eee380..0642ccb8 100644
--- a/src/MiniExcel/Utils/CustomPropertyHelper.cs
+++ b/src/MiniExcel/Utils/CustomPropertyHelper.cs
@@ -22,6 +22,7 @@ internal class ExcelColumnInfo
         public string ExcelFormat { get; internal set; }
         public double? ExcelColumnWidth { get; internal set; }
         public string ExcelIndexName { get; internal set; }
+        public bool ExcelHidden { get; internal set; }
         public bool ExcelIgnore { get; internal set; }
         public int ExcelFormatId { get; internal set; }
         public ColumnType ExcelColumnType { get; internal set; }
@@ -192,6 +193,7 @@ private static IEnumerable<ExcelColumnInfo> ConvertToExcelCustomPropertyInfo(Pro
                     ExcelColumnIndex = p.GetAttribute<ExcelColumnIndexAttribute>()?.ExcelColumnIndex ?? excelColumnIndex,
                     ExcelIndexName = p.GetAttribute<ExcelColumnIndexAttribute>()?.ExcelXName ?? excelColumn?.IndexName,
                     ExcelColumnWidth = p.GetAttribute<ExcelColumnWidthAttribute>()?.ExcelColumnWidth ?? excelColumn?.Width,
+                    ExcelHidden = p.GetAttribute<ExcelHiddenAttribute>()?.ExcelHidden ?? excelColumn?.Hidden ?? false,
                     ExcelFormat = excelFormat ?? excelColumn?.Format,
                     ExcelFormatId = excelColumn?.FormatId ?? -1,
                     ExcelColumnType = excelColumn?.Type ?? ColumnType.Value,
@@ -285,6 +287,7 @@ internal static void SetDictionaryColumnInfo(List<ExcelColumnInfo> props, object
                     if (dynamicColumn.Name != null)
                         p.ExcelColumnName = dynamicColumn.Name;
                     isIgnore = dynamicColumn.Ignore;
+                    p.ExcelHidden = dynamicColumn.Hidden;
                     p.ExcelColumnWidth = dynamicColumn.Width;
                     p.ExcelColumnType = dynamicColumn.Type;
                     p.CustomFormatter = dynamicColumn.CustomFormatter;
@@ -352,6 +355,7 @@ internal static ExcelColumnInfo GetColumnInfosFromDynamicConfiguration(string co
 
             prop.Nullable = true;
             prop.ExcelIgnore = dynamicColumn.Ignore;
+            prop.ExcelHidden = dynamicColumn.Hidden;
             prop.ExcelColumnType = dynamicColumn.Type;
             prop.ExcelColumnWidth = dynamicColumn.Width;
             prop.CustomFormatter = dynamicColumn.CustomFormatter;
diff --git a/tests/MiniExcelTests/MiniExcelAutoAdjustWidthTests.cs b/tests/MiniExcelTests/MiniExcelAutoAdjustWidthTests.cs
index e101fa00..49083387 100644
--- a/tests/MiniExcelTests/MiniExcelAutoAdjustWidthTests.cs
+++ b/tests/MiniExcelTests/MiniExcelAutoAdjustWidthTests.cs
@@ -4,6 +4,7 @@
 using MiniExcelLibs.Tests.Utils;
 using System.Data;
 using System.Data.SQLite;
+using System.Diagnostics;
 using Xunit;
 
 namespace MiniExcelLibs.Tests;
@@ -150,42 +151,43 @@ private static void AssertExpectedWidth(string path, OpenXmlConfiguration config
 
         var columns = worksheetPart.Worksheet.GetFirstChild<Columns>();
         Assert.False(columns == null, "No column width information was written.");
+        
         foreach (var column in columns.Elements<Column>())
         {
-            var expectedWidth = column.Min.Value switch
+            var expectedWidth = column.Min?.Value switch
             {
-                1 => ExcelWidthCollection.GetApproximateTextWidth(AutoAdjustTestParameters.column1MaxStringLength),
-                2 => ExcelWidthCollection.GetApproximateTextWidth(AutoAdjustTestParameters.column2MaxStringLength),
+                1 => AutoAdjustTestParameters.Column1MaxLen,
+                2 => AutoAdjustTestParameters.Column2MaxLen,
                 3 => configuration.MinWidth,
                 4 => configuration.MaxWidth,
-                _ => throw new Exception("Unexpected column"),
+                _ => throw new UnreachableException()
             };
 
-            Assert.Equal(expectedWidth, column.Width?.Value);
+            Assert.Equal(ExcelColumnWidth.GetWidthFromTextLength(expectedWidth), Math.Round(column.Width!.Value, 8));
         }
     }
 
     private static class AutoAdjustTestParameters
     {
-        public const int column1MaxStringLength = 32;
-        public const int column2MaxStringLength = 16;
-        public const int column3MaxStringLength = 2;
-        public const int column4MaxStringLength = 100;
-        public const int minStringLength = 8;
-        public const int maxStringLength = 50;
+        internal const int Column1MaxLen = 32;
+        internal const int Column2MaxLen = 16;
+        private const int Column3MaxLen = 2;
+        private const int Column4MaxLen = 100;
 
         public static List<string[]> GetTestData() =>
         [
-            new string[]
-            {
-                new('1', column1MaxStringLength), new('2', column2MaxStringLength / 2),
-                new('3', column3MaxStringLength / 2), new('4', column1MaxStringLength)
-            },
-            new string[]
-            {
-                new('1', column1MaxStringLength / 2), new('2', column2MaxStringLength),
-                new('3', column3MaxStringLength), new('4', column4MaxStringLength)
-            }
+            [
+                new('1', Column1MaxLen), 
+                new('2', Column2MaxLen / 2),
+                new('3', Column3MaxLen / 2),
+                new('4', Column4MaxLen)
+            ],
+            [
+                new('1', Column1MaxLen / 2), 
+                new('2', Column2MaxLen),
+                new('3', Column3MaxLen), 
+                new('4', Column4MaxLen)
+            ]
         ];
 
         public static List<Dictionary<string, object>> GetDictionaryTestData() => GetTestData()
@@ -198,8 +200,7 @@ public static List<Dictionary<string, object>> GetDictionaryTestData() => GetTes
         {
             EnableAutoWidth = true,
             FastMode = true,
-            MinWidth = ExcelWidthCollection.GetApproximateTextWidth(minStringLength),
-            MaxWidth = ExcelWidthCollection.GetApproximateTextWidth(maxStringLength)
+            MaxWidth = 50
         };
     }
 }
\ No newline at end of file