TopoUSA will take your track and calculate the elevation profile based on it's terrain map. The TopoUSA data will also calculate the total climing and descending elevation, average grade, and climbing and descending distances. Note that TopoUSA does not use the elevation data recorded in your track file. It uses the map data underneath your track. Generally this is going to be more accurate than the elevation data recorded by your GPS.

The Mapsource program supplied with the Garmin GPS units will show you an elevation profile of a track based on the elevation data recorded by the GPS but will not calculate and display and data on that elevation profile.