One thing to consider when planning backpacking trails is the amount of up and down that is involved. This chart shows a comparison between some famous trails as well as some we have had experience with….
Some of the figures are estimates, such as the Hayduke where a number of alternates are possible meaning varying length and ascents depending on the route chosen. Also measuring ascent accurately seems to be a difficult task. For the West Highland Way (a well documented trail) for example, estimates I have seen vary from 3,155m to 4,700m.
So it gives a rough idea of relative climbing for different trails. But you can see the steepest trails listed are in the European Alps and Dolomites- you will have strong leg muscles after hiking these!
A wee walk 