diff --git a/ClosedXML/ClosedXML/ClosedXML/ClosedXML.csproj b/ClosedXML/ClosedXML/ClosedXML/ClosedXML.csproj
index 3e55efc..7f22e1d 100644
--- a/ClosedXML/ClosedXML/ClosedXML/ClosedXML.csproj
+++ b/ClosedXML/ClosedXML/ClosedXML/ClosedXML.csproj
@@ -138,6 +138,7 @@
     <Compile Include="Excel\Misc\XLCallbackAction.cs" />
     <Compile Include="Excel\Misc\XLReentrantEnumerableSet.cs" />
     <Compile Include="Excel\XLConstants.cs" />
+    <Compile Include="Utils\GraphicsUtils.cs" />
     <Compile Include="XLHelper.cs" />
     <Compile Include="Excel\AutoFilters\XLFilteredColumn.cs" />
     <Compile Include="Excel\AutoFilters\XLCustomFilteredColumn.cs" />
diff --git a/ClosedXML/ClosedXML/ClosedXML/Extensions.cs b/ClosedXML/ClosedXML/ClosedXML/Extensions.cs
index 449104f..dbc2e57 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Extensions.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Extensions.cs
@@ -9,6 +9,7 @@
 using System.Xml.Linq;
 using System.IO;
 using System.Xml;
+using ClosedXML.Utils;
 
 [assembly: CLSCompliantAttribute(true)]
 namespace ClosedXML.Excel
@@ -184,7 +185,6 @@
             return font;
         }
 
-        private static Graphics graphics = Graphics.FromImage(new Bitmap(1, 1));
         public static Double GetWidth(this IXLFontBase fontBase, String text, Dictionary<IXLFontBase, Font> fontCache)
         {
             if (XLHelper.IsNullOrWhiteSpace(text))
@@ -192,7 +192,7 @@
 
             var font = GetCachedFont(fontBase, fontCache);
 
-            var textSize = graphics.MeasureString(text, font, Int32.MaxValue, StringFormat.GenericTypographic);
+            var textSize = GraphicsUtils.MeasureString(text, font);
 
             double width = (((textSize.Width / (double)7) * 256) - (128 / 7)) / 256;
             width = (double)decimal.Round((decimal)width + 0.2M, 2);
@@ -213,7 +213,7 @@
         public static Double GetHeight(this IXLFontBase fontBase, Dictionary<IXLFontBase, Font> fontCache)
         {
             var font = GetCachedFont(fontBase, fontCache);
-            var textSize = graphics.MeasureString("X", font, Int32.MaxValue, StringFormat.GenericTypographic);
+            var textSize = GraphicsUtils.MeasureString("X", font);
             return (double)textSize.Height * 0.85;
         }
 
diff --git a/ClosedXML/ClosedXML/ClosedXML/Utils/GraphicsUtils.cs b/ClosedXML/ClosedXML/ClosedXML/Utils/GraphicsUtils.cs
new file mode 100644
index 0000000..954c22c
--- /dev/null
+++ b/ClosedXML/ClosedXML/ClosedXML/Utils/GraphicsUtils.cs
@@ -0,0 +1,22 @@
+using System;
+using System.Drawing;
+
+namespace ClosedXML.Utils
+{
+    internal static class GraphicsUtils
+    {
+        public static SizeF MeasureString(string s, Font font)
+        {
+            SizeF result;
+            using (var image = new Bitmap(1, 1))
+            {
+                using (var g = Graphics.FromImage(image))
+                {
+                    result = g.MeasureString(s, font, Int32.MaxValue, StringFormat.GenericTypographic);
+                }
+            }
+
+            return result;
+        }
+    }
+}
diff --git a/ClosedXML/ClosedXML/ClosedXML_Net3.5/ClosedXML_Net3.5.csproj b/ClosedXML/ClosedXML/ClosedXML_Net3.5/ClosedXML_Net3.5.csproj
index b73f954..b41afcb 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Net3.5/ClosedXML_Net3.5.csproj
+++ b/ClosedXML/ClosedXML/ClosedXML_Net3.5/ClosedXML_Net3.5.csproj
@@ -876,6 +876,9 @@
     <Compile Include="..\ClosedXML\PathHelper.cs">
       <Link>PathHelper.cs</Link>
     </Compile>
+    <Compile Include="..\ClosedXML\Utils\GraphicsUtils.cs">
+      <Link>Utils\GraphicsUtils.cs</Link>
+    </Compile>
     <Compile Include="..\ClosedXML\XLHelper.cs">
       <Link>XLHelper.cs</Link>
     </Compile>