The numbers game of forex is just crazy. pip by the leverage you take directly correlates to percent revenue (ignoring spread price), Imagine, having a 1k with 1:100 leverage, it means that with around a 200 pip change in one day, you can profit 2k.
Now, 1:50, means half a percent increase, so a 200 pip change in a 1:50 leverage is 100% percent change to your initial value, and a 1:20 leverage, a 200pip is 40% change profit. So in the last matter, if the market changes 200 pips (it rarely does, and if it do, who am I to predict that!), you have earned 400 dollars with a 1k on 1:20 leverage.
this is just a quick way to know your numbers and get a sense of things. Hope that helps, these numbers made sense to me today.
Measure everything wrt to 1k , 1:100, 100pips, 1k profit and you can derive everything else from this very fast. or in a 1:100, each pip is 10, and in 1:20, each pip is 2 dollar. If that makes sense.