The risk/reward ratio helps investors manage their risk of losing money on trades. Even if a trader has some profitable trades, he will lose money over time if his win rate is below 50%. The risk/reward ratio measures the difference between a trade entry point to a stop-loss and a sell or take-profit order. Comparing these two provides the ratio of profit to loss, or reward to risk.
Investors often use stop-loss orders when trading individual stocks to help minimize losses and directly manage their investments with a risk/reward focus. A stop-loss order is a trading trigger placed on a stock that automates the selling of the stock from a portfolio if the stock reaches a specified low. Investors can automatically set stop-loss orders through brokerage accounts and typically do not require exorbitant additional trading costs.