Debt-to-equity ratio, explained
The debt-to-equity ratio is one of the quickest ways to gauge whether a company is financed sensibly or leaning too hard on borrowed money. Here's the formula, a worked example, and what actually counts as a "good" ratio.
What it measures
The debt-to-equity (D/E) ratio compares how much of a company is funded by debt versus how much by its owners' money (shareholders' equity). It answers a simple question: if things went wrong, how much of a cushion is there before lenders are exposed? A company drowning in debt is fragile; one funded mostly by equity has room to absorb shocks.
The formula
Both figures come straight off the balance sheet. Some analysts use only interest-bearing debt rather than all liabilities — both are valid, as long as you're consistent when comparing companies.
Worked example
A company's balance sheet shows £400m of total debt and £500m of shareholders' equity:
A ratio of 0.8 means the company has 80p of debt for every £1 of equity — a fairly conservative, comfortable position for most businesses.
What's a good debt-to-equity ratio?
There's no single magic number — it depends heavily on the industry. As a rough rule of thumb:
| Ratio | Broad read |
|---|---|
| Under 1.0 | Conservative — debt is well covered by equity |
| 1.0 – 2.0 | Moderate — normal for many established firms |
| Above 2.0 | Higher risk — unless the sector typically runs hot |
The sector caveat matters a lot. Utilities, banks and real estate routinely run high D/E because their cash flows are stable and predictable, so more debt is normal and safe. Software and other asset-light businesses usually run low. Judging a utility by a software company's standard — or vice versa — gives you the wrong answer. Always compare a company against its own sector.
Why it matters for value investing
A strong balance sheet is one of the four pillars Oak Growth checks on every company, because debt is what turns a temporary problem into a permanent one. A great business with too much debt can still be a poor investment if a downturn forces it to raise money at the worst possible time. Healthy leverage is a precondition for durability — which is exactly what long-term investors are buying.
Use it alongside, not instead of, other measures. D/E tells you about financial structure, not profitability or value. Pair it with returns on equity, free cash flow and a valuation measure to get the full picture — which is what a full analysis does.