Just a few links to keep handy.
Create profiles http://www.gpsvisualizer.com
1L of water is 1Kg/2.2lbs
Density of water = 1gram/cc.
1L = 1000cc
1000 * 1 = 1000g = 1Kg = 2.2lbs
Calculating book time. The Appalachian Mountain Club's White Mountain Guide uses a very approximate formula to estimate the time a given hike will take. They calculate 30 minutes for every mile, plus 30 minutes for every 1,000 feet of ascent. Descent is assumed to take as long as walking on a flat trail.
Old hiking resources.