Value investing is easily one of the most popular ways to find great stocks in any market environment. After all, who wouldn’t want to find stocks that are either flying under the radar and are compelling buys, or offer up tantalizing discounts when compared to fair value?One way to find these companies is by looking at several key metrics and financial ratios, many of which are crucial in the value stock selection process. Let’s Principal Financial Group, Inc. PFG stock into this equation and find out if it is a good choice for value-oriented investors right now, or if investors subscribing to this methodology should look elsewhere for top picks:PE RatioA key metric that value investors always look at is the Price to Earnings Ratio, or PE for short. This shows us how much investors are willing to pay for each dollar of earnings in a given stock, and is easily one of the most popular financial ratios in the world. The best use of the PE ratio is to compare the stock’s current PE ratio with: a) where this ratio has been in the past; b) how it compares to the average for the industry/sector; and c) how it compares to the market as a whole.On this front, Principal Financial Group has a trailing twelve months PE ratio of 11.65, as you can see in the chart below:Image Source: Zacks Investment ResearchThis level actually compares favorably with the market at large, as the PE for the S&P 500 stands at about 28.84. If we focus on the long-term PE trend Principal Financial Group’s PE level puts it below its midpoint over the past five years. Moreover, the current level is fairly below the highs for this stock, suggesting it might be a good entry point.Image Source: Zacks Investment ResearchHowever, the stock’s PE also compares unfavorably with the Zacks Finance sector’s trailing twelve months PE ratio, which stands at 18.98. At the very least, this indicates that the stock is slightly undervalued right now, compared to its peers.Image Source: Zacks Investment ResearchWe should also point out that Principal Financial Group has a forward PE ratio (price relative to this year’s earnings) of just 9.88, so it is fair to expect an increase in the company’s share price in the near future.P/S RatioAnother key metric to note is the Price/Sales ratio. This approach compares a given stock’s price to its total sales, where a lower reading is generally considered better. Some people like this metric more than other value-focused ones because it looks at sales, something that is far harder to manipulate with accounting tricks than earnings.Right now, Principal Financial Group has a P/S ratio of about 1.28. This is substantially lower than the S&P 500 average, which comes in at 5.39 right now. Also, as we can see in the chart below, this is somewhat below the highs for this stock in particular over the past few years.Image Source: Zacks Investment ResearchBroad Value OutlookIn aggregate, Principal Financial Group currently has a Value Score of A, putting it into the top 20% of all stocks we cover from this look. This makes Principal Financial Group a solid choice for value investors, and some of its other key metrics make this pretty clear too.For example, the PEG ratio for Principal Financial Group is just 0.64, a level that is lower than the industry average of 0.74. The PEG ratio is a modified PE ratio that takes into account the stock’s earnings growth rate. Its P/CF ratio for Principal Financial Group is just 8.32, a level that is lower than the industry average of 13.44. Clearly, PFG is a solid choice on the value front from multiple angles.What About the Stock Overall?Though Principal Financial Group might be a good choice for value investors, there are plenty of other factors to consider before investing in this name. In particular, it is worth noting that the company has a Growth Score of D and Momentum Score of A. This gives Principal Financial Group a Zacks VGM score — or its overarching fundamental grade — of B. (You can read more about the Zacks Style Scores here >>)Meanwhile, the company’s recent earnings estimates have been encouraging. This has had a noticeable impact on the consensus estimate, as the current year consensus estimate remained unchanged in the past two months, whereas the full year 2022 estimate also remained unchanged in the past two months. You can see the consensus estimate trend and recent price action for the stock in the chart below:Principal Financial Group, Inc. Price and Consensus Principal Financial Group, Inc. price-consensus-chart | Principal Financial Group, Inc. QuoteOwing to such bearish estimate trends the stock has a Zacks Rank #3 (Hold), which is why we are looking for in-line performance from the company in the near term.Bottom LinePrincipal Financial Group is an inspired choice for value investors, as it is hard to beat its incredible lineup of statistics on this front. However, a Zacks Rank #3, it is hard to get too excited about this company overall. In fact, over the past two years, the sector has clearly underperformed the market at large, as you can see below:Image Source: Zacks Investment ResearchSo, value investors might want to wait for estimates, analyst sentiment and broader factors to turn around in this name first, but once that happens, this stock could be a compelling pick. 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