Return On Equity Calculator

The owner's question

Profit tells you the company made money. It does not tell you whether that was impressive.

Eight million of profit is remarkable from a business with twenty million of owners' capital in it and unremarkable from one with four hundred million. Same profit, completely different achievement, and the only way to tell them apart is to divide.

Return on equity does that division. Net income over shareholders' equity, expressed as a percentage.

ROE = (Net income after tax / Shareholders' equity) × 100

Read it as the return the owners earned on the capital they have tied up in the business. It is the number a shareholder cares about most directly, because it is denominated in their own money rather than the company's total resources.

The calculator wants two figures and gives the percentage to three decimal places. Both come off the published accounts, net income from the bottom of the income statement, shareholders' equity from the balance sheet.

Working one out

A company earns 8,000,000 after tax on shareholders' equity of 40,000,000.

8,000,000 divided by 40,000,000 is 0.2. Times 100 gives 20 percent.

So for every hundred of owners' capital in the business, the business produced twenty of profit in the year.

Worth converting that into something you can feel. At 20 percent, retained earnings alone would double the equity base in under four years, if nothing were paid out and the return held. That is why ROE is watched so closely by long term shareholders. It is not just this year's performance, it is roughly the speed at which the owners' stake compounds.

Now, before that number means anything, there is one thing that has to be checked, and it is not on the income statement.

Why a bigger ROE is not always a better company

Equity is the denominator. So anything that shrinks equity raises ROE, whether or not the business improved.

Take two companies earning identical profit.

B's return on equity is double A's. B's return on assets is half. Same profit in both cases.

What B has done is fund itself mostly with borrowed money, so there is very little owners' capital for the profit to be spread across. The return per unit of owner capital is spectacular precisely because there is so little of it.

That is not fraud, and it is not always a bad idea. Borrowing to fund a business that earns more than the interest costs is the ordinary mechanics of finance. But the shareholders in B are carrying a great deal more risk for their 40 percent, and if trading turns down the same leverage works in reverse and does so violently.

So the habit worth forming is simple. Never read an ROE without looking at the ROA next to it. If ROE is high and ROA is ordinary, the gap is borrowed money. Our return on assets calculator gives you the other half in one step.

The two are joined by an exact relationship, incidentally:

ROE = ROA × (Total assets / Shareholders' equity)

Check it on B. Return on assets of 8 percent times an assets-to-equity ratio of 5.00 gives 40 percent. That second term has a name, the equity multiplier, and it is a pure leverage measure. A multiplier of 1.00 means no debt at all.

Splitting it into three

There is a decomposition that turns ROE from a verdict into a diagnosis, and it has been the standard way of doing this since a chemicals company invented it in the 1920s.

ROE = Profit margin × Asset turnover × Equity multiplier

Multiply the three and the revenue and asset terms cancel, leaving net income over equity. It is the same ratio, opened up.

Run it on Company B, which turns over 60,000,000 of revenue.

Margin is 8 over 60, which is 13.33 percent. Turnover is 60 over 100, which is 0.60. Multiplier is 100 over 20, which is 5.00.

13.33 percent times 0.60 times 5.00 gives 40.00 percent. Same answer, but now you can see where it came from: healthy margins, sluggish asset use, and a great deal of leverage.

Two companies with an identical 20 percent ROE can be entirely different animals. One a high margin business that barely borrows, the other a thin margin operation running on debt. The single number cannot tell them apart. These three can.

Which equity figure to use

The calculator takes whatever you type, so the choice is yours, and it is worth making deliberately since analysts do not all make the same one.

Year-end or average? Equity at the balance sheet date is the simplest and is what most people use. But net income was earned across the whole year, while year-end equity is a single day's snapshot that already includes that year's retained profit. Matching a full year's income against an opening-plus-closing average is arguably more consistent, and many published figures do it that way. Either is defensible. Being consistent between the companies you compare is not optional.

Total equity or common equity? If there is preferred stock, the strict version subtracts preferred equity from the denominator and preferred dividends from the numerator, so that what remains is the return to ordinary shareholders. For most companies there is no preferred stock and the question does not arise.

Watch for buybacks. A company repurchasing its own shares reduces equity directly, which lifts ROE without a penny of extra profit. If ROE has climbed while net income has not, check the share count before congratulating anyone.

And a caution about the denominator itself. Shareholders' equity is book value, an accounting figure built from historical cost. A company that has written assets down heavily, or bought back stock above book, can end up with very small or even negative equity, at which point the ratio stops carrying any useful meaning. If equity is close to zero the percentage will be enormous and worthless.

And whether the number is actually enough

Here is the part that turns ROE from a description into a judgement.

Twenty percent sounds good. Good compared with what?

The honest benchmark is the return shareholders could get elsewhere at similar risk, which is the cost of equity. If that is 12 percent, a 20 percent ROE means the business is creating value at a rate of eight percentage points a year on every unit of owner capital. If the cost of equity is 22 percent, the same 20 percent ROE means the business is quietly destroying value despite being profitable.

That comparison has a name and a tool. Residual income charges the company for its equity capital and reports what is left, and it turns negative at exactly the point where ROE falls below the cost of equity. Our residual income calculator does that subtraction, and our WACC calculator helps establish the rate to compare against.

Two other things worth doing before drawing conclusions. Look at several years rather than one, because a single year can be flattered by an asset sale or a tax item. And compare within an industry, since capital intensity varies so much that a software company and a utility are not on the same scale at all.

Questions people ask

What counts as a good ROE?

It depends on the industry and on what shareholders could earn elsewhere at similar risk. The meaningful test is whether ROE exceeds the cost of equity, not whether it clears a fixed number.

What is the difference between ROE and ROA?

ROE divides profit by the owners' capital only. ROA divides it by everything the company controls, debt funded assets included. The gap between them is leverage, and ROE equals ROA multiplied by the equity multiplier.

Can a high ROE be a bad sign?

It can. Heavy borrowing, aggressive buybacks or written-down assets all shrink equity and inflate the ratio without improving the business. Check the ROA and the debt level before treating a high figure as good news.

Should I use average equity?

It is arguably more consistent, since income is earned over a period and year-end equity is a single date. Either works. What matters is using the same basis for every company you compare.

What about a company making a loss?

ROE would be negative, and the ratio stops being informative once equity is very small or negative itself. For loss making or thinly capitalised companies, look at the underlying trend rather than the percentage.

Where do I get the two numbers?

Net income from the bottom of the income statement, shareholders' equity from the balance sheet. For a listed company both are in the annual filing.

Why three decimal places?

Because ROE differences between companies are often fractions of a point, and rounding to whole numbers would flatten distinctions that matter when you are ranking a list.

References

A note on the sources. The two inputs are defined items on the published accounts rather than quantities anyone invents, and the Securities and Exchange Commission's guide for investors sets out what shareholders' equity is and where net income sits, in language written for people reading a set of accounts for the first time. The argument in the last section, that a profitable company can still be failing its owners if it does not clear its cost of equity, is stated in those terms by CFA Institute, and is the basis of the residual income approach to valuation.

1. U.S. Securities and Exchange Commission, Beginners' Guide to Financial Statements, on shareholders' equity as the amount owners have invested and on where net income appears in the accounts. https://www.sec.gov/about/reports-publications/investorpubsbegfinstmtguide
2. CFA Institute, Residual Income Valuation, on the fact that an income statement charges for debt capital through interest expense but not for equity capital, so a company can report positive net income while failing to add value for shareholders. https://www.cfainstitute.org/insights/professional-learning/refresher-readings/2026/residual-income-valuation
3. U.S. Securities and Exchange Commission, Beginners' guide to financial statements, Investor.gov glossary entry. https://www.investor.gov/introduction-investing/investing-basics/glossary/beginners-guide-financial-statement
4. Brealey, R.A., Myers, S.C., and Allen, F., Principles of Corporate Finance, McGraw-Hill Education, chapters on financial statement analysis and the decomposition of return on equity.