On the way down historical price to sales or price to book is a better method to use to "call the bottom".

What is considered a good price to book ratio?

It is difficult to pinpoint a specific numeric value and definitively declare it a "good" price-to-book (P/B) ratio, in terms of indicating a stock is undervalued and therefore a good investment. It is more helpful to identify some general parameters, or a range for P/B value, and then consider various other factors and valuation measures that more accurately interpret the P/B value and forecast a company's potential for growth.

The P/B ratio has been favored by value investors for decades and is widely used by market analysts. Traditionally, any value under 1.0 is considered a good P/B value, indicating a potentially undervalued stock. However, value investors often consider stocks with a P/B value under 3.0.

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