I based my earlier post on an old message from another board. Had I given it any thought, I might have dropped any two of the three equivalent formulas. I really didn't intend to spread confusion!
[quote=steelfrog]energy used (in Calories) = 0.6 * weight (in pounds) * distance (in miles) * (1 + 8.8 * grade)
One implication is that it takes the same energy to cover a mile no matter how fast you do it. This breaks down for slow walking but works well for running and strenuous hiking. Another implication is that twice the weight does indeed mean twice the calories. What is more interesting to me is that hiking up an 11% grade (600 feet per mile) doubles your energy use (compared to walking on a flat trail). And a 22% grade (1200 feet/mile) triples it.
