How to Use the Return on Equity Calculator
Return on equity (ROE) shows how much profit each dollar of owners' money produced. The formula is net income ÷ average equity × 100, and this calculator uses the average of beginning and ending equity as the denominator.
Ending equity alone is a poor denominator when shares were issued or dividends paid during the period, because the closing balance no longer represents the capital actually at work. Averaging the two balances smooths that out. If you are entering a quarter or a half-year, put the real length in the period field: the annualized figure is the period ROE shown on screen multiplied by 12 ÷ that number of months.
ROE rises when equity shrinks, so a company can lift it simply by taking on more debt — always read it next to the debt-to-equity ratio. A DuPont breakdown (net margin × asset turnover × financial leverage) helps identify which of the three is driving the change. With zero or negative equity the ratio stops being meaningful, so the calculator pauses instead of printing a number.
Frequently Asked Questions
You can, but if shares were issued or dividends paid mid-period the closing balance misstates the capital actually employed. The beginning-and-ending average reduces that distortion.
Yes. Enter 3 in the period field and you get both the quarterly ROE and an annualized figure scaled by 12 ÷ 3. Treat the annualized number carefully in a seasonal business.
Not by itself. Adding debt shrinks equity and lifts ROE without any improvement in the business, so check it alongside the debt-to-equity ratio and interest coverage.