Chnaged 15 to 20 multiplier in margins and page size so that margins and page size are effectively set/retrieved in points (pts). This is a breaking change potentially, but otherwise it is not clear what the units are for page width, height, and margins.

DocX/DocX.cs

                     {
                         float f;
                         if (float.TryParse(top.Value, out f))
-                            return (int)(f / 15.0f);
+                            return (int)(f / 20.0f);
                     }
                 }
             }
                     XAttribute top = pgMar.Attribute(xName);
                     if (top != null)
                     {
-                        top.SetValue(value * 15);
+                        top.SetValue(value * 20);
                     }
                 }
             }
             }
         }
 
-        public float MarginTop
+        /// <summary>
+		/// Top margin value in points. 1pt = 1/72 of an inch. Word internally writes docx using units = 1/20th of a point.
+		/// </summary>
+		public float MarginTop
         {
             get
             {
             }
         }
 
-        public float MarginBottom
+		/// <summary>
+		/// Bottom margin value in points. 1pt = 1/72 of an inch. Word internally writes docx using units = 1/20th of a point.
+		/// </summary>
+		public float MarginBottom
         {
             get
             {
             }
         }
 
-        public float MarginLeft
+		/// <summary>
+		/// Left margin value in points. 1pt = 1/72 of an inch. Word internally writes docx using units = 1/20th of a point.
+		/// </summary>
+		public float MarginLeft
         {
             get
             {
             }
         }
 
-        public float MarginRight
+		/// <summary>
+		/// Right margin value in points. 1pt = 1/72 of an inch. Word internally writes docx using units = 1/20th of a point.
+		/// </summary>
+		public float MarginRight
         {
             get
             {
             }
         }
 
-        public float PageWidth
+		/// <summary>
+		/// Page width value in points. 1pt = 1/72 of an inch. Word internally writes docx using units = 1/20th of a point.
+		/// </summary>
+		public float PageWidth
         {
             get
             {
                         {
                             float f;
                             if (float.TryParse(w.Value, out f))
-                                return (int)(f / 15.0f);
+                                return (int)(f / 20.0f);
                         }
                     }
                 }
 
-                return (int)(11906.0f / 15.0f);
+                return (12240.0f / 20.0f);
             }
 
             set
 
                         if (pgSz != null)
                         {
-                            pgSz.SetAttributeValue(XName.Get("w", DocX.w.NamespaceName), value * 15);
+                            pgSz.SetAttributeValue(XName.Get("w", DocX.w.NamespaceName), value * 20);
                         }
                     }
                 }
             }
         }
 
-        public float PageHeight
+		/// <summary>
+		/// Page height value in points. 1pt = 1/72 of an inch. Word internally writes docx using units = 1/20th of a point.
+		/// </summary>
+		public float PageHeight
         {
             get
             {
                         {
                             float f;
                             if (float.TryParse(w.Value, out f))
-                                return (int)(f / 15.0f);
+                                return (int)(f / 20.0f);
                         }
                     }
                 }
 
-                return (int)(16838.0f / 15.0f);
+				return (15840.0f / 20.0f);
             }
 
             set
 
                         if (pgSz != null)
                         {
-                            pgSz.SetAttributeValue(XName.Get("h", DocX.w.NamespaceName), value * 15);
+                            pgSz.SetAttributeValue(XName.Get("h", DocX.w.NamespaceName), value * 20);
                         }
                     }
                 }