I usually don't calculate the percentage. I keep the stop loss limited and profits trail!
How much percentage of profit is sufficient in intraday trading?
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It depends on a lot of things. On a very good day, it can be as high as 5-10% if your risk sizing is appropriate. Anything above 2% is considered decent. Considering that trading is a volatile activity to be involved with, it makes sense to net 1-2% on an average day and try to be consistent with few and small drawdowns in between. That's the real way to be successful with intraday trading.