Using Cash Flow Analysis vs. P/E to Value Stocks

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Many investors believe that cash flow ratios are a better measurement of a stock’s value than Price Earnings Ratio or P/E. Why? Because the amount of cash a company is capable of generating is one of the more important measures of its health. You'll probably hear more about P/E than almost any other metric on valuation, but it can't really give you an accurate picture of a company’s ability to generate cash, which is ultimately the bottom line.

Key Takeaways

  • The P/E ratio, or the ratio of a stock's price to its earnings per share (EPS), is a metric that can help investors decide the value of a stock.
  • Cash flow equals net income plus depreciation and amortization, while free cash flow shows how much cash a company generated in the past 12 months.
  • Price to cash flow or price to free cash flow ratios show how well a company generates available cash, unlike EPS which only looks at net income.
  • Any of these ratios can help investors decide whether the market has overvalued or undervalued a stock compared to others in the same industry.

What P/E Is 

P/E represents the ratio of a stock’s price to its Earnings Per Share, referred to as EPS. It's an important metric if for no other reason than many people think it is. When a company’s P/E is very high or low, it gets top billing on the news. It snags a lot of attention. 

Metrics that examine a company’s price relative to its cash position are equally important, but they're overlooked by many. In fact, they might even be more important.

The Importance of Cash

The reality is that without cash, a company won’t last long. That might seem obviously simple, but many, many companies have failed simply because cash is in too short supply. So how do you use cash flow ratios to see if a company is under- or over-valued, which is the same purpose of P/E? Two primary measurements shed light on a company’s valuation.

Price to Cash Flow

Price to cash flow is determined by dividing the stock’s price by cash flow per share. Many prefer this measurement because it uses cash flow rather than net income the way computing EPS does. 

Cash flow is a company’s net income with the depreciation and amortization charges added back in. These charges reduce net income, but they don't represent actual outlays of cash so they artificially reduce the company’s reported cash. Because these expenses don’t involve actual cash, the company has more cash than the net income figure indicates.

Free Cash Flow

Free cash flow is a refinement of cash flow that goes a step further and adds in one-time expense capital expenses, dividend payments, and other non-occurring charges back to cash flow. The result is how much cash the company generated in the previous 12 months. Divide the current price by the free cash flow per share and the result describes the value the market places on the company’s ability to generate cash.

Undervalued and Overvalued Stock

Like the P/E ratio, both these cash flow ratios may imply where the markets value a specific company. Lower numbers relative to a company's industry and sector suggest the market has undervalued its stock, or the market may perceive that cashflow is unsustainable in the long run. Conversely, higher numbers than its industry and sector might mean the market has either overvalued the shares or that the market anticipates a future increase in those cashflows.

Valuation Calculations

Thankfully, you don’t have to do all these calculations yourself. Many websites include these valuation numbers for your consideration, including Their detailed quotes offer both cash flow ratios. Just enter a stock in the quote box on the top bar if you use Reuters, then click on “Ratios” in the left column links.

The Bottom Line

Like all ratios, these don’t tell the whole story. Be sure to look at other metrics to verify relative value. But these cash flow ratios can give you some significant clues as to how a company is performing and to how the market values its stock as a whole.