How to find the vertical height between any two points? Is there any source in the Internet that allows me to calculate the vertical height between two arbitrary points?

Im thinking of something like the calculate route function of Google Maps. But instead of the trip length, I want to see the vertical height.

Do you have any experience with such information?
You can get an elevation profile of a route from using Google Maps and GPS Visualiser, as detailed on Aaron James Young's blog. In summary:


Create your route on Google Maps.
Grab the link, and stick it into GPS Visualiser.
Bingo! An elevation profile chart is created showing how the altitude changes over the route.