I trade using technical analysts. and I use the trend line to see the condition of the trade. and in placing the SL I also use the trendline analysis. Therefore to put my SL also has no definite calculation. all depends on the market conditions at that time. but that is evident in every trade I always use SL, because I think SL is the only way to purse could minimize the loss in trade. when it's actually the case that traders do not or can not be disciplined in doing so need to cut loss in mind to replace the re-use of cutting losses by using stop loss media