There is no tool to quantify a risk-reward ratio because the variable on either side of that equation has infinite possibilities. I’m not sure that you are using the right term when you say risk-reward ratio. On the risk side, you can identify the beta of a stock. That represents how volatile a stock is compared to the market. There are many other measurements of so-called “risk” but the term risk is misused on Wall Street and is often used as a substitute for “volatility” which is not risk.
The expected return is rather simple to calculate. Pick a date in the future and discount the earnings and cash flow from that date until now and multiply that by the growth of earnings. That’s where the target expectation should be.