Valuation Ratios

Quick Answer

Valuation ratios help fundamental analysts judge whether a stock is overvalued, undervalued, or fairly priced. Price-to-earnings (P/E) compares price to a company's earnings; price-to-book (P/B) compares price to its accounting value. Both are most useful compared against industry peers, the market average, or the company's own history, not read alone.

The exam covers two valuation ratios: P/E and P/B. Each highlights a different question about how the market is pricing a stock.

What Does the Price-to-Earnings (P/E) Ratio Show?

P/E is the most widely used valuation metric for stocks. It shows how much investors are willing to pay for each dollar of earnings.

Formula: P/E equals Market Price Per Share divided by Earnings Per Share (EPS).

How is EPS itself calculated? EPS equals (Net Income minus Preferred Dividends) divided by Common Shares Outstanding. Preferred dividends are subtracted first because that income belongs to preferred shareholders, not common shareholders.

How Do You Calculate P/E in an Example?

Stock price: 60 dollars.

EPS: 4 dollars.

P/E ratio: 60 dollars divided by 4 dollars equals 15.

Interpretation: investors are willing to pay 15 dollars for every 1 dollar of this company's earnings.

How Do You Interpret a High or Low P/E?

Higher P/E: investors expect higher future growth (or the stock may be overvalued).

Lower P/E: investors expect lower growth (or the stock may be undervalued).

Growth stocks typically have higher P/E ratios than value stocks.

P/E is meaningless if the company has negative earnings (losses).

Exam Tip: Gotchas

A high P/E does not automatically mean overvalued; it may reflect justified growth expectations. A low P/E does not automatically mean undervalued; it may reflect legitimate concerns. Always compare P/E to industry peers, not in isolation.

How Does a Stock Split Affect the P/E Ratio?

A stock split (for example, 2-for-1 or 3-for-1) increases the number of shares outstanding and cuts both the market price and EPS by the same proportion.

Because the price and EPS move together, the P/E ratio itself does not change.

Example: a 50 dollar stock with EPS of 2.50 dollars has a P/E of 20 (50 dollars divided by 2.50 dollars). After a 2-for-1 split, the price falls to 25 dollars and EPS falls to 1.25 dollars, so the P/E is still 25 dollars divided by 1.25 dollars equals 20.

What Does the Price-to-Book (P/B) Ratio Show?

P/B compares the market's valuation of a company to its accounting (book) value.

Formula: P/B equals Market Price Per Share divided by Book Value Per Share.

Total book value (shareholders' equity) equals Total Assets minus Total Liabilities. It includes the preferred holders' share.

Book value per common share equals (Total Assets minus Total Liabilities minus Preferred Stock) divided by Common Shares Outstanding.

Preferred stock comes out first because preferred holders have a priority claim on assets ahead of common shareholders. When a company has no preferred stock outstanding, the formula reduces to Shareholders' Equity divided by Common Shares Outstanding.

How Do You Calculate P/B in an Example?

Stock price: 45 dollars.

Book value per share: 30 dollars.

P/B ratio: 45 dollars divided by 30 dollars equals 1.5.

Interpretation: the market values this company at 1.5 times its book value.

How Do You Interpret P/B Above or Below 1.0?

P/B greater than 1.0: the market values the company above its book value (common for profitable companies).

P/B less than 1.0: the market values the company below its book value (may indicate undervaluation or distress).

Particularly useful for financial companies (banks, insurance) and asset-heavy industries.

Less useful for companies with significant intangible assets (technology, services).

Exam Tip: Gotchas

Book value is an accounting measure based on historical cost, not market value, so a company's true worth may differ significantly from it. P/B below 1.0 could mean the stock is a bargain or that the company is in trouble; context matters.

How Do the Valuation Ratios Compare?

P/E: Formula: Price divided by EPS. Best used for: Comparing growth expectations. Limitation: Meaningless with negative earnings.

P/B: Formula: Price divided by Book Value Per Share. Best used for: Asset-heavy and financial companies. Limitation: Ignores intangible assets.

What Should You Check on Exam Day?

P/E is meaningless when earnings are negative; check for that before trusting the ratio.

EPS equals (Net Income minus Preferred Dividends) divided by Common Shares Outstanding; do not forget to subtract preferred dividends.

A stock split does not change the P/E ratio; price and EPS adjust by the same proportion.

Neither a high P/E nor a low P/B is automatically good or bad; both need a peer or historical comparison.

Book value is historical-cost accounting, not current market value.

Additional Details

Published: 2026-11-02T21:59:23.883Z