The debt-to-equity ratio measures how much a company relies on borrowed money relative to shareholder equity to finance its assets. It divides total liabilities by total shareholders' equity. A higher ratio means the company is more leveraged — more of its asset base is financed by debt than by equity.
This is one of the most widely used measures of financial risk because it captures the fundamental balance between what the company owes and what its shareholders own. A debt-to-equity ratio of 1.0 means liabilities and equity are equal. Above 1.0, the company has more debt than equity. Below 1.0, equity exceeds debt.
The acceptable range varies dramatically by industry. Utilities and REITs routinely operate with debt-to-equity ratios above 2.0 because their stable cash flows support higher leverage. Technology companies and consumer brands often have ratios below 0.5 because their business models are less capital-intensive. Banks and financial institutions have fundamentally different balance sheet structures and should not be compared to non-financial companies using this metric.
One important nuance: some highly profitable companies like Apple and Starbucks have negative equity due to aggressive share buyback programs that push accumulated deficit below zero. In those cases, the debt-to-equity ratio becomes mathematically meaningless (negative or extremely large) and should not be used as a risk indicator.