Unlike a number of day trading strategies where you can have a win/loss ratio of less than 50% and still make money, scalp traders must have a high win/loss ratio. This is due to the fact that losing and winning trades are generally equal in size. The necessity of being right is the primary factor scalp trading is such a challenging method of making money in the market.
Assess how much capital you're willing to risk on each trade. Many successful day traders risk less than 1% to 2% of their account per trade. If you have a $40,000 trading account and are willing to risk 0.5% of your capital on each trade, your maximum loss per trade is $200 (0.005 x $40,000). Set aside a surplus amount of funds you can trade with and you're prepared to lose. Remember, it may or may not happen.