The Book-To-Market Ratio is one measure of a company's worth. The ratio compares the book value of a company to its market value. A company's book value is determined by examining its historical cost, also known as accounting value. The market capitalization of a company is calculated by its share price in the stock market and the number of shares outstanding.What is the book-to-market ratio?The book-to-market ratio, sometimes called the P/B ratio, is a financial ratio that measures the value of a company's shares in relation to the company's book value. The book value is the total value of a company's assets, minus any liabilities. The market value is the current price of a company's shares on the stock market.The book-to-market ratio is calculated by dividing the market value of a company's shares by the book value of the company's assets.A high book-to-market ratio indicates that a company's shares are undervalued in relation to its assets. A low book-to-market ratio indicates that a company's shares are overvalued in relation to its assets. The book-to-market ratio is used by investors to identify companies that may be undervalued or overvalued. It is also a useful tool for analyzing a company's financial health.The book-to-market ratio is not the only factor to consider when assessing a company's value. Other factors, such as earnings, cash flow, and debt, can also be important. Investors should consider the book-to-market ratio in conjunction with other ratios and factors to get a comprehensive picture of a company's value.