There are three calculators that can be accessed by selecting Tools in the main menu. These calculators are very useful tools to help you manage risk.
The Quantity calculator outputs the number of shares to purchase for a given dollar risk. It bases its calculation on stop and entry prices.
The Reward vs. Risk calculator outputs the Reward/Risk ratio given the Target, Stop and Entry prices
The Entry price calculator outputs the ideal entry price for a desired Reward/Risk ratio. It bases its calculation on the Stop and Target prices.