Slope angle calculator

Slope angle calculator to calculate the avalanche danger base on the slope steepness

Distance between Contour line (Equidistance) =
(Find on the map you are using)

Distance between the contour lines in meter=
(Measure on your map)
(1:25,000 map scales means that 4cm on the map is equal to 1km)
(1:50,000 map scale means that 2cm on the map is equal to 1km)

Slope angle=

How to calculate the angle with the Pythagorean Theorem

Equidistance=20 m (b)
Distance between the contour lines in meter= 30 m (a)
20m/30m= 0.6666
Inv Tan(0.6666) =36.69 º

The Adjacent is used and not the Hypotenuse because on a TOPO map the distance you measurer is always the direct line between 2 points not taking any height difference in account.

	hypotenuse side
opposite side
	adjacent side

To calculate the angle divide b with a and the press the INV and TAN button on your calculator