If you know the gradient on a hill and its length, is it theoretically possible to be able to calculate a flat cycling equivalent i.e. how far would you have to cycle on the level to equal the energy expenditure of the hill climb? The motivation for this is that when cycling from Guildford to work, I have a choice of two routes. Route 1 is 10.6 miles with 1175 ft of ascent. Route 2 is 13.1 miles with 870 ft of ascent. Which route is likely to be easier?