Reverse-engineering a P/E ratio: how much earnings growth Alphabet's price implies

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A developer behind the Stockinsky research tool explains a method that starts from a stock's price-to-earnings ratio rather than from forecasts, asking what annual earnings growth is needed to earn a target return. The approach assumes a ten-year holding period, an exit P/E of 15, and an 8% required return for US stocks. Using Alphabet as the worked example, the author notes the stock fell 12.64% on October 29, 2026 to close at USD 283.82, leaving a P/E of 26.26x. Under those assumptions, the implied required EPS growth rate is roughly 14.2% per year. The author stresses the formula is a screening tool rather than a definitive valuation, since its inputs are deliberate assumptions.

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