diff --git a/lib/tiles/OfflineTilesEnablerLayer.js b/lib/tiles/OfflineTilesEnablerLayer.js
index bd5be75..1771c41 100644
--- a/lib/tiles/OfflineTilesEnablerLayer.js
+++ b/lib/tiles/OfflineTilesEnablerLayer.js
@@ -419,26 +419,7 @@ define([
          */
         estimateTileSize : function(callback)
         {
-            if(this._lastTileUrl)
-            {
-                var url = this.offline.proxyPath? this.offline.proxyPath + "?" +  this._lastTileUrl : this._lastTileUrl;
-                request.get(url,{
-                    handleAs: "text/plain; charset=x-user-defined",
-                    headers: {
-                        "X-Requested-With": "" //bypasses a dojo xhr bug
-                    },
-                    timeout: 2000
-                }).then(function(response){
-                        var img = Base64Utils.wordToBase64(Base64Utils.stringToWord(response));
-                        callback(img.length + url.length,null);
-                    },
-                    function(err){
-                        callback(null,err);
-                    });
-            }
-            else{
-                callback(NaN);
-            }
+            this._tilesCore._estimateTileSize(this._lastTileUrl,this.offline.proxyPath,callback);
         },
 
         /**
diff --git a/lib/tiles/TilesCore.js b/lib/tiles/TilesCore.js
index 5920728..22f31df 100644
--- a/lib/tiles/TilesCore.js
+++ b/lib/tiles/TilesCore.js
@@ -4,6 +4,7 @@
  */
 define([
     "dojo/query",
+    "dojo/request",
     "esri/geometry/Point",
     "esri/geometry/Extent",
     "esri/SpatialReference",
@@ -12,7 +13,7 @@ define([
     "tiles/base64utils",
     "tiles/tilingScheme"
     ],
-    function(query,Point,Extent,SpatialReference,TileInfo,LOD,Base64Utils,TilingScheme){
+    function(query,request,Point,Extent,SpatialReference,TileInfo,LOD,Base64Utils,TilingScheme){
         "use strict";
         var TilesCore = function(){
 
@@ -49,6 +50,37 @@ define([
                 req.send(null);
             };
 
+            /**
+             * Makes a request to a tile url and uses that as a basis for the
+             * the average tile size.
+             * Future Iterations could call multiple tiles and do an actual average.
+             * @param callback
+             * @returns {Number} Returns NaN if there was a problem retrieving the tile
+             */
+            this._estimateTileSize = function(lastTileUrl,proxyPath,callback)
+            {
+                if(lastTileUrl)
+                {
+                    var url = proxyPath? proxyPath + "?" +  lastTileUrl : lastTileUrl;
+                    request.get(url,{
+                        handleAs: "text/plain; charset=x-user-defined",
+                        headers: {
+                            "X-Requested-With": "" //bypasses a dojo xhr bug
+                        },
+                        timeout: 2000
+                    }).then(function(response){
+                            var img = Base64Utils.wordToBase64(Base64Utils.stringToWord(response));
+                            callback(img.length + url.length,null);
+                        },
+                        function(err){
+                            callback(null,err);
+                        });
+                }
+                else{
+                    callback(NaN);
+                }
+            };
+
             /**
              * Loads a csv file into storage.
              * Format is "url,img\r\n somebase64image,http://esri.com"
diff --git a/lib/tiles/offlineTilesEnabler.js b/lib/tiles/offlineTilesEnabler.js
index 5389766..ceb9761 100644
--- a/lib/tiles/offlineTilesEnabler.js
+++ b/lib/tiles/offlineTilesEnabler.js
@@ -323,26 +323,7 @@ define([
                  */
                 layer.estimateTileSize = function(callback)
                 {
-                    if(layer._lastTileUrl)
-                    {
-                        var url = this.offline.proxyPath? this.offline.proxyPath + "?" +  layer._lastTileUrl : layer._lastTileUrl;
-                        request.get(url,{
-                            handleAs: "text/plain; charset=x-user-defined",
-                            headers: {
-                                "X-Requested-With": "" //bypasses a dojo xhr bug
-                            },
-                            timeout: 2000
-                        }).then(function(response){
-                                var img = Base64Utils.wordToBase64(Base64Utils.stringToWord(response));
-                                callback(img.length + url.length,null);
-                            },
-                        function(err){
-                            callback(null,err);
-                        });
-                    }
-                    else{
-                        callback(NaN);
-                    }
+                    layer._tilesCore._estimateTileSize(this._lastTileUrl,this.offline.proxyPath,callback);
                 };
 
                 /**