There are several ways in which to classify the difficulty of mountains. Based on a formula used in the Dutch magazine Fiets
FIETS-index = [H2 / D*10] + (T - 1000):1000
H = difference in height
D = distance in meters
T = top of mountain in meters
[The second part of the formula does only apply to mountains above 1000 meters]
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Fiets index
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