Derek on 7\30\8:Please reference the work around in KB 35305Access the MapCircleEventsArgs MapRadius property and perform additional calculations. To determine the correct map radius, divide the MapCircleEventsArgs MapRadius value by 4. To determine the correct screen radius, divide the MapCircleEventsArgs MapRadius value by 4 and then divide the result by the map to screen ratio (resolution). public void ServerAction(ESRI.ArcGIS.ADF.Web.UI.WebControls.ToolEventArgs args){ Map mmap = args.Control as Map; MapCircleEventArgs mcea = (MapCircleEventArgs)args; double maptoscreenratio = mmap.Extent.Width / mmap.ViewWidth; double mapradius = mcea.MapRadius / 4; double screenradius = (mcea.MapRadius / 4) / maptoscreenratio; System.Diagnostics.Debug.Print("Map To Screen Ratio: {0}", maptoscreenratio); System.Diagnostics.Debug.Print("Map Radius: {0} units)", mapradius); System.Diagnostics.Debug.Print("Screen Radius: {0} pixels)", screenradius);}