https://www.giscourse.com/how-to-create-a-slope-map-from-a-digital-terrain-model-in-arcgis/

https://gis.stackexchange.com/questions/218272/creating-slope-map-from-dem-using-qgis

On ArcGIS Software :

Arctoolbox>Spatial Analyst>Surface>Slope

You can create slope from DEM. The most of the geo processing softwares having direct tool for it. In ARCGIS You can use through Spatial Analyst or 3D Analyst function. for that go to Arctoolbox>Spatial Analyst>Surface>Slope or Arctoolbox>3D Analyst tools> Raster Surface> Slope.

The Premier open source software QGIS also provide the tool for finding the Slope.

go to Processing toolbox- Raster terrain Analysis - Slope.

Both softwares are giving results slope in percentage as well as degree.

i agree with Sumith

Hi,

Navigate to System ArcToolboxes > Spatial Analyst Tools > Surface > Slope.

https://www.researchgate.net/post/Creating_Slope_Map_from_Dem

Already discussed in RG in Ali K. Resen

Is your raster in a geographic or projected coordinate system?  If geographic, please re-project to a projected coordinate system using the Project tool, then run the Slope.  If your raster is currently in a projected coordinate system please see the following Web Help:

The range of slope values in degrees is 0 to 90. For percent rise, the range is 0 for near infinity. A flat surface is 0 percent, a 45 degree surface is 100 percent, and as the surface becomes more vertical, the percent rise becomes increasingly larger.

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z000000v2000000.htm

Oh, and it doesn't matter if you use Slope for 3D Analyst or Spatial Analyst.

Dear Legesse,

Could you please specify the DEM type you are using and the steps you say you are following.

If we can not see the issue your way we may keep giving "useless" solutions either for you or for the scientific audience.

Regards

first you need to install arc map software, after that use slope in the spatial analysis, if you have QGIS use slope in raster analysis.