diff --git a/ClosedXML/Excel/Cells/XLCell.cs b/ClosedXML/Excel/Cells/XLCell.cs
index 2029f97..8255203 100644
--- a/ClosedXML/Excel/Cells/XLCell.cs
+++ b/ClosedXML/Excel/Cells/XLCell.cs
@@ -965,9 +965,17 @@
                     }
                     else if (value == XLDataType.Number)
                     {
+                        var v = _cellValue;
                         double dTest;
-                        if (Double.TryParse(_cellValue, XLHelper.NumberStyle, CultureInfo.InvariantCulture, out dTest))
-                            _cellValue = dTest.ToInvariantString();
+                        double factor = 1.0;
+                        if (v.EndsWith("%"))
+                        {
+                            v = v.Substring(0, v.Length - 1);
+                            factor = 1 / 100.0;
+                        }
+
+                        if (Double.TryParse(v, XLHelper.NumberStyle, CultureInfo.InvariantCulture, out dTest))
+                            _cellValue = (dTest * factor).ToInvariantString();
                         else
                         {
                             throw new ArgumentException(
diff --git a/ClosedXML_Examples/Misc/DataTypes.cs b/ClosedXML_Examples/Misc/DataTypes.cs
index 0e2e356..e642a7f 100644
--- a/ClosedXML_Examples/Misc/DataTypes.cs
+++ b/ClosedXML_Examples/Misc/DataTypes.cs
@@ -150,6 +150,11 @@
             ws.Cell(ro, co + 1).Value = "'123.45";
             ws.Cell(ro, co + 1).DataType = XLDataType.Number;
 
+            ws.Cell(++ro, co).Value = "Percentage Text to Number:";
+            ws.Cell(ro, co + 1).Value = "'55.12%";
+            ws.Cell(ro, co + 1).Style.NumberFormat.SetNumberFormatId((int)XLPredefinedFormat.Number.PercentPrecision2);
+            ws.Cell(ro, co + 1).DataType = XLDataType.Number;
+
             ws.Cell(++ro, co).Value = "@ format to Number:";
             ws.Cell(ro, co + 1).Style.NumberFormat.Format = "@";
             ws.Cell(ro, co + 1).Value = 123.45;
diff --git a/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx b/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
index f33318d..cab157a 100644
--- a/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx b/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx
index f3bf2bf..2b49926 100644
--- a/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx
Binary files differ