Whystock uses a trailing P/E relative model adjusted for return on equity (ROE) to estimate fair value. This gives you a quick sense of whether a stock is trading above or below its historical fair multiple.
Fair P/E = 18 + (ROE × 20). Fair Value = (Current Price ÷ Trailing P/E) × Fair P/E.
The base P/E of 18 reflects a typical market multiple; we add a premium for higher ROE (capital efficiency). The upside/downside percentage is the difference between fair value and current price.