Our route planner measures in 2D, so won’t take account of changes in elevation when measuring distance, however the effect of hills on distance is actually negligible and well within the accuracy thresholds for online map measurement tools. For a 24 mile route at a typical gradient of 12 metres per mile, the difference between the 2D distance measurement and the 3D distance measurement is only about 100cm.
We have a number of detailed guides giving instructions on how to use many of the features of plotaroute.com.
We have a number of video tutorials demonstrating how to use key features on the site.
Take at look at our Forums for more help and advice.