General level classification*

●○○○○: Easy trekking
+ 4 hours walking time (700 Hm/10 km)**
+ Easy hiking trails that are easy to walk (mountain trails with blue dot)
+ No additional difficulties such as high altitude

●●○○○: Moderate trekking
+ 5.5 hours walking time (1000 Hm/14 km)**
+ Moderate hiking trails (mountain trails with blue and red dot)
+ Surefootedness necessary
+ Between the trekking days also sometimes a rest day
+ Himalaya: altitudes up to 4,500 m possible depending on the trail

●●●○○: Demanding trekking
+ 7 hours walking time (1500 Hm/20 km)**
+ Moderate hiking trails, possibly partly trail-less (mountain trails with red dot)
+ surefootedness and limited freedom from vertigo necessary
+ Himalaya: altitudes up to 5.500 m possible depending on the trail
+ Overnight stay in tents per trail partly necessary

●●●●○: Difficult trekking
+ 8 hours walking time (1800 Hm/23 km)**.
+ Moderate, in places difficult mountain trails (mountain trails with red or black dot)
+ Surefootedness and freedom from vertigo necessary (exposed passages, possibly with rope-secured passages, are possible)
+ Himalaya: altitudes up to 5,500 m possible depending on the trail, with several stages in succession at higher altitudes
+ Overnight stay in tents per trail partly necessary

●●●●●: Extreme trekking (expedition character)
+ 8 hours walking time (1800 Hm/23 km)**
+ Difficult mountain trails (mountain trails with black point)
+ Glacier climbing possible
+ Absolute surefootedness and freedom from vertigo necessary (exposed passages, possibly with rope-secured passages)
+ Himalaya: altitudes up to 6,500 m possible, with several stages in succession at altitudes above 5,000 m

* You will find a detailed description of the trail in question under “Requirements”.
** Pure walking time according to Outdooractive calculation. In the Himalayas adapted to the slower walking style due to higher altitude.