Racer 1, on Topozone.com I linked to the part of my course where I do hill sprints.
Once you find the quad sector for the road and hill you are looking for you need to update the view scale to a 1:10,000 ratio. This zooms the map in as far as it goes. Then you just count the contour lines.
If my link comes up correct you should see an orange cross in the middle of the road. You then can count down over 5 contour lines at 3 meters per contour,(3*5=15) you can see that the road rises 15 meters over the course of about 100 meters distance.
That orange cross I mentioned will appear wherever you click on the map and reorient the map.
Using this you can actually follow your favorite road race course for example, clicking along and checking every dip and rise in the road.