What does return on equity measure?
ROE compares profit attributable to shareholders with the book equity supporting that profit. It measures an accounting return, not the return an investor earns from buying shares at a particular market price. Equity is a balance-sheet amount, whereas market capitalization reflects the price investors currently pay.
Match the ownership scope. For common-shareholder ROE, use net income available to common shareholders after preferred dividends and the corresponding common equity. Do not divide a consolidated profit including non-controlling interests by equity attributable only to the parent.
ROE formula and average equity
ROE = net income ÷ average equity × 100. Average equity = (beginning equity + ending equity) ÷ 2. The opening balance should precede the income period and the closing balance should end it. Use the single-balance method only when a snapshot is appropriate or no opening balance is available, and label that choice in comparisons.
A two-point average is convenient but not time-weighted. A large share issue in December adds to closing equity even though the new capital was available for little of the year. Monthly averages can be better for material capital changes. You can enter an independently computed average in the single-balance method.
Worked example: 20% ROE
Net income is 1.5 million. Equity is 7 million at the start and 8 million at the end of the year. Average equity is 7.5 million, so ROE is 1.5 ÷ 7.5 × 100 = 20%. Using only the 8 million closing balance would give 18.75%.
Suppose the following year delivers the same profit but average equity falls to 6 million after distributions. ROE rises to 25% even though profit does not improve. The movement comes from the denominator, not stronger operating performance.
Why leverage and buybacks change ROE
Borrowing can reduce the share of assets financed by equity. If returns on those assets exceed the financing cost after tax, leverage can lift ROE. The same mechanism magnifies losses when operating performance weakens, while interest and repayment commitments remain. A high ROE should therefore be read with debt and interest coverage.
A share buyback normally reduces book equity. It can mechanically raise ROE if profit falls less than the denominator, even without sales or margin improvement. A debt-funded buyback combines that denominator effect with additional financing risk. Reconcile the change in equity before calling a rising ratio operational progress.
ROE versus ROA and ROIC
ROA here divides net income by total assets. ROE divides the same scoped earnings by equity, so the difference partly reflects financing. A simplified DuPont breakdown expresses ROE as net profit margin × asset turnover × assets-to-equity, using compatible average balances.
ROIC uses after-tax operating profit before financing costs and invested capital funded by both debt and equity. It helps separate operating returns from the financing effects that can dominate ROE.
Negative equity and other interpretation traps
Negative profit with positive equity produces a meaningful negative ROE. Negative equity is different: dividing a loss by negative equity could misleadingly show a positive percentage. This tool requires a positive denominator and flags non-positive opening or closing equity even if the average remains positive.
Very small equity, accumulated losses, large dividends and write-downs can create unusual ratios. Compare several periods, inspect equity movements and distinguish recurring profit from exceptional items. There is no single ROE target suitable for every industry or capital structure.
Frequently asked questions
Is a high ROE always good?
No. It can reflect profitable operations, but also leverage, buybacks or an unusually small equity base. Compare the profit trend, debt, distributions and risk before treating a higher percentage as an improvement.
Should ROE use net income or EBIT?
This calculator uses net income because equity holders bear interest and tax effects. EBIT is an operating measure used in other return ratios; replacing net income with EBIT changes the definition.
Can I calculate ROE with negative equity?
A mathematical quotient is possible, but a conventional return percentage is usually misleading. The tool leaves it unavailable when the chosen equity denominator is zero or negative.
Why is book equity different from market value?
Book equity reflects the accounting residual of assets after liabilities. Market value is the price investors place on shares. ROE based on book equity is not an earnings yield on the current share price.