About the ROE Calculator
How efficiently does a company turn shareholders' money into profit? Return on equity answers that question directly, and it's one of the metrics Warren Buffett has long pointed to as a sign of a well-run business. This calculator computes it from two numbers pulled straight off a company's financial statements.
How It Works
The calculator divides net income by average shareholder equity and expresses the result as a percentage. That's the entire calculation - no adjustments, no averaging periods beyond whatever equity figure you enter.
Examples
Solid profitability
$120,000 in net income against $800,000 in average shareholder equity produces an ROE of 15%, meaning the company generated 15 cents of profit for every dollar of equity.
Comparing two companies
A second company with the same $120,000 net income but only $400,000 in equity shows a 30% ROE, twice as high, though a closer look might reveal that lower equity base comes from more debt financing rather than better operations.
Advantages
- Straightforward single-formula calculation with no hidden assumptions
- Flags explicitly that ROE can be inflated by leverage, unlike simpler ROE tools
- Useful for quickly comparing profitability across companies of different sizes
Common Mistakes
- Confusing ROE (a company-level metric based on shareholder equity) with ROI (a return on a specific investment amount)
- Comparing ROE across companies without checking whether one is far more leveraged than the other
- Using a single point-in-time equity figure instead of an average, which can distort the ratio in a year with major buybacks or losses
Edge Cases to Watch For
- ROE ignores how that equity was built, so a company that's taken on heavy debt to shrink its equity base (through buybacks, for instance) can show an inflated ROE without actually becoming more efficient.
- A company with negative shareholder equity produces a meaningless or misleadingly negative ROE, since the formula assumes a positive equity base.
- Using average equity over the period (rather than a single point-in-time balance) generally produces a more accurate figure, since equity can change significantly within a year from earnings, dividends, and buybacks.
Common Use Cases
- Evaluating how efficiently a company generates profit from its equity base
- Comparing profitability across companies in the same industry
- Screening for potentially high-quality, capital-efficient businesses