diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMax.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMax.cs
index af2a1cd..64614d8 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMax.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMax.cs
@@ -1,7 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 
 namespace ClosedXML.Excel
 {
@@ -21,7 +18,7 @@
         }
         public void Maximum(XLCFContentType type, Double value, XLColor color)
         {
-            Maximum(type, value.ToString(), color);
+            Maximum(type, value.ToInvariantString(), color);
         }
         public void HighestValue(XLColor color)
         {
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMid.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMid.cs
index 85ec2b5..13c31ec 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMid.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMid.cs
@@ -1,7 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 
 namespace ClosedXML.Excel
 {
@@ -21,7 +18,7 @@
         }
         public IXLCFColorScaleMax Midpoint(XLCFContentType type, Double value, XLColor color)
         {
-            return Midpoint(type, value.ToString(), color);
+            return Midpoint(type, value.ToInvariantString(), color);
         }
         public void Maximum(XLCFContentType type, String value, XLColor color)
         {
@@ -29,7 +26,7 @@
         }
         public void Maximum(XLCFContentType type, Double value, XLColor color)
         {
-            Maximum(type, value.ToString(), color);
+            Maximum(type, value.ToInvariantString(), color);
         }
         public void HighestValue(XLColor color)
         {
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMin.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMin.cs
index 9da4137..0c33c04 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMin.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFColorScaleMin.cs
@@ -22,7 +22,7 @@
         }
         public IXLCFColorScaleMid Minimum(XLCFContentType type, Double value, XLColor color)
         {
-            return Minimum(type, value.ToString(), color);
+            return Minimum(type, value.ToInvariantString(), color);
         }
 
         public IXLCFColorScaleMid LowestValue(XLColor color)
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFDataBarMax.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFDataBarMax.cs
index 4664b42..cfedb03 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFDataBarMax.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFDataBarMax.cs
@@ -20,7 +20,7 @@
         }
         public void Maximum(XLCFContentType type, Double value)
         {
-            Maximum(type, value.ToString());
+            Maximum(type, value.ToInvariantString());
         }
 
         public void HighestValue()
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFDataBarMin.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFDataBarMin.cs
index d57f403..11770f8 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFDataBarMin.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFDataBarMin.cs
@@ -21,7 +21,7 @@
         }
         public IXLCFDataBarMax Minimum(XLCFContentType type, Double value)
         {
-            return Minimum(type, value.ToString());
+            return Minimum(type, value.ToInvariantString());
         }
 
         public IXLCFDataBarMax LowestValue()
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFIconSet.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFIconSet.cs
index 4b9bab1..6210197 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFIconSet.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLCFIconSet.cs
@@ -1,7 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 
 namespace ClosedXML.Excel
 {
@@ -21,7 +18,7 @@
         }
         public IXLCFIconSet AddValue(XLCFIconSetOperator setOperator, Double value, XLCFContentType type)
         {
-            return AddValue(setOperator, value.ToString(), type);
+            return AddValue(setOperator, value.ToInvariantString(), type);
         }
     }
 }
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLConditionalFormat.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLConditionalFormat.cs
index 2569b1d..d42b9fc 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLConditionalFormat.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/ConditionalFormats/XLConditionalFormat.cs
@@ -238,58 +238,58 @@
 
         public IXLStyle WhenEquals(Double value)
         {
-            Values.Initialize(new XLFormula { Value = value.ToString() });
+            Values.Initialize(new XLFormula(value));
             Operator = XLCFOperator.Equal;
             ConditionalFormatType = XLConditionalFormatType.CellIs;
             return Style;
         }
         public IXLStyle WhenNotEquals(Double value)
         {
-            Values.Initialize(new XLFormula { Value = value.ToString() });
+            Values.Initialize(new XLFormula(value));
             Operator = XLCFOperator.NotEqual;
             ConditionalFormatType = XLConditionalFormatType.CellIs;
             return Style;
         }
         public IXLStyle WhenGreaterThan(Double value)
         {
-            Values.Initialize(new XLFormula { Value = value.ToString() });
+            Values.Initialize(new XLFormula(value));
             Operator = XLCFOperator.GreaterThan;
             ConditionalFormatType = XLConditionalFormatType.CellIs;
             return Style;
         }
         public IXLStyle WhenLessThan(Double value)
         {
-            Values.Initialize(new XLFormula { Value = value.ToString() });
+            Values.Initialize(new XLFormula(value));
             Operator = XLCFOperator.LessThan;
             ConditionalFormatType = XLConditionalFormatType.CellIs;
             return Style;
         }
         public IXLStyle WhenEqualOrGreaterThan(Double value)
         {
-            Values.Initialize(new XLFormula { Value = value.ToString() });
+            Values.Initialize(new XLFormula(value));
             Operator = XLCFOperator.EqualOrGreaterThan;
             ConditionalFormatType = XLConditionalFormatType.CellIs;
             return Style;
         }
         public IXLStyle WhenEqualOrLessThan(Double value)
         {
-            Values.Initialize(new XLFormula { Value = value.ToString() });
+            Values.Initialize(new XLFormula(value));
             Operator = XLCFOperator.EqualOrLessThan;
             ConditionalFormatType = XLConditionalFormatType.CellIs;
             return Style;
         }
         public IXLStyle WhenBetween(Double minValue, Double maxValue)
-        {
-            Values.Initialize(new XLFormula { Value = minValue.ToString() });
-            Values.Add(new XLFormula { Value = maxValue.ToString() });
+    {
+            Values.Initialize(new XLFormula (minValue));
+            Values.Add(new XLFormula(maxValue));
             Operator = XLCFOperator.Between;
             ConditionalFormatType = XLConditionalFormatType.CellIs;
             return Style;
         }
         public IXLStyle WhenNotBetween(Double minValue, Double maxValue)
         {
-            Values.Initialize(new XLFormula { Value = minValue.ToString() });
-            Values.Add(new XLFormula { Value = maxValue.ToString() });
+            Values.Initialize(new XLFormula(minValue));
+            Values.Add(new XLFormula(maxValue));
             Operator = XLCFOperator.NotBetween;
             ConditionalFormatType = XLConditionalFormatType.CellIs;
             return Style;
@@ -314,7 +314,7 @@
         }
         public IXLStyle WhenIsTop(Int32 value, XLTopBottomType topBottomType = XLTopBottomType.Items)
         {
-            Values.Initialize(new XLFormula { Value = value.ToString() });
+            Values.Initialize(new XLFormula(value));
             Percent = topBottomType == XLTopBottomType.Percent;
             ConditionalFormatType = XLConditionalFormatType.Top10;
             Bottom = false;
@@ -322,7 +322,7 @@
         }
         public IXLStyle WhenIsBottom(Int32 value, XLTopBottomType topBottomType = XLTopBottomType.Items)
         {
-            Values.Initialize(new XLFormula { Value = value.ToString() });
+            Values.Initialize(new XLFormula(value));
             Percent = topBottomType == XLTopBottomType.Percent;
             ConditionalFormatType = XLConditionalFormatType.Top10;
             Bottom = true;
diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/Misc/XLFormula.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/Misc/XLFormula.cs
index 33dd7d2..2ff7a44 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/Misc/XLFormula.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/Misc/XLFormula.cs
@@ -16,6 +16,21 @@
             IsFormula = defaultFormula.IsFormula;
         }
 
+        public XLFormula(String value)
+        {
+            Value = value;
+        }
+
+        public XLFormula(double value)
+        {
+            Value = value.ToInvariantString();
+        }
+        
+        public XLFormula(int value)
+        {
+            Value = value.ToInvariantString();
+        }
+
         internal String _value;
         public String Value 
         { 
diff --git a/ClosedXML/ClosedXML/ClosedXML/Extensions.cs b/ClosedXML/ClosedXML/ClosedXML/Extensions.cs
index dbc2e57..4d36490 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Extensions.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Extensions.cs
@@ -171,6 +171,16 @@
 
     }
 
+    public static class DoubleExtensions
+    {
+        //All numbers are stored in XL files as invarient culture this is just a easy helper
+        public static String ToInvariantString(this Double value)
+        {
+            return value.ToString(CultureInfo.InvariantCulture);
+        }
+
+    }
+
     public static class FontBaseExtensions
     {
 
@@ -241,14 +251,6 @@
                 return XDocument.Load(reader);
             }
         }
-
-        //public static void SaveToStream(this XDocument document, Stream stream)
-        //{
-        //    using (XmlReader reader = XmlReader.Open(stream))
-        //    {
-        //        return XDocument.Load(reader);
-        //    }
-        //}
     }
 
     public static class EnumerableExtensions
diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/AdjustToContents.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/AdjustToContents.xlsx
index 9334c2a..a7d8b81 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/AdjustToContents.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/AdjustToContents.xlsx
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