diff --git a/OSCADSharp/OSCADSharp/OSCADSharp.csproj b/OSCADSharp/OSCADSharp/OSCADSharp.csproj
index ffceba2..3fb9457 100644
--- a/OSCADSharp/OSCADSharp/OSCADSharp.csproj
+++ b/OSCADSharp/OSCADSharp/OSCADSharp.csproj
@@ -40,6 +40,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Sizes.cs" />
     <Compile Include="Transforms\LinearExtrudedObject.cs" />
     <Compile Include="Scripting\BlockFormatter.cs" />
     <Compile Include="Scripting\BlockStatementObject.cs" />
diff --git a/OSCADSharp/OSCADSharp/Sizes.cs b/OSCADSharp/OSCADSharp/Sizes.cs
new file mode 100644
index 0000000..f47c7dd
--- /dev/null
+++ b/OSCADSharp/OSCADSharp/Sizes.cs
@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OSCADSharp
+{
+    public class Sizes
+    {
+        public const double OneInch = 25.4;
+        public const double HalfInch = OneInch / 2;
+        public const double QuarterInch = HalfInch / 2;
+        public const double EigthInch = QuarterInch / 2;
+        public const double SixteenthInch = EigthInch / 2;
+
+        public double InchesToMilimeters(double inches)
+        {
+            return inches * 0.03937008;
+        }
+    }
+}