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This question already has an answer here:

What value should be used for scale while calculating slope percent in QGIS?

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Some documents suggest is as 111120 and some as 365130.

I am using ESPG 4326 projection and do I need to convert this value to some other value using lat like given in this link:

How to properly get the slope from an ASTER DEM in QGIS?

marked as duplicate by user2856, ArMoraer, nmtoken, Hornbydd, aldo_tapia Jan 5 '18 at 10:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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The link you provided says:

scale=370400 (if elevation is in feet) or scale=111120 (if elevation is in meters)

So, what units are you using for elevation? Feet or meters?

And if you want to do this simpler, you could reproject to a CRS that uses the same units as your elevation measure.

  • how to know units used for elevation? – sudhanshud Sep 4 '17 at 22:48
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    If you don't have metadata from the provider then check the height of some well known place. – user30184 Sep 5 '17 at 4:43

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