Devised inside the DuPont company around 1912–1920 by the engineer F. Donaldson Brown (who took it to General Motors), the decomposition rests on nothing but multiplying by 1, twice:
ROE = NI/Equity = (NI/Revenue) × (Revenue/Assets) × (Assets/Equity)
net margin × asset turnover × financial leverageHow does the DuPont formula work?
Revenue cancels between the first two factors and assets between the last two. Balance-sheet terms are averages. The middle two factors also give ROA = net margin × asset turnover, so you can equally write ROE = ROA × leverage.
Each factor is a strategy lever:
- Net margin: the price lever. How much of each sale survives? Raised by pricing power, mix, cost discipline.
- Asset turnover: the speed lever. How many rupees of sales does each rupee of assets generate per year? Raised by utilization, velocity, asset-light design.
- Financial leverage: the balance-sheet lever
= average total assets ÷ average total equity. How many rupees of assets stand on each rupee of shareholders' money? It rises with borrowing, but also with any other liability. Payables, deferred revenue, provisions all push assets above equity. So the factor measures more than debt. A debt-free company running on supplier credit shows leverage above 1, and that kind is free and benign. The survival ratios in Ratio Toolkit II give this lever its full treatment.
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Worked example: Hindustan Unilever against Walmart
The centerpiece is Hindustan Unilever against Walmart. One is an Indian FMCG and the other a US retailer, and they earn nearly the same ROE from opposite machines. All figures are illustrative, modeled on ~FY24/FY25 scale, so pull the actual filings (HUL annual report from hul.co.in or BSE; Walmart 10-K from SEC EDGAR):
| Illustrative | HUL (₹ cr) | Walmart ($bn) |
|---|---|---|
| Revenue | 62,000 | 680 |
| Net income (parent) | 10,300 | 19.5 |
| Average total assets | 77,500 | 256 |
| Average equity (parent) | 51,000 | 88 |
| Net margin | 16.6% | 2.9% |
| Asset turnover | 0.80× | 2.66× |
| Financial leverage | 1.52× | 2.91× |
| ROE (product) | ≈ 20.2% | ≈ 22.2% |
| Check: NI ÷ avg equity | 10,300 ÷ 51,000 = 20.2% | 19.5 ÷ 88 = 22.2% |
| ROA (margin × turnover) | 13.3% | 7.6% |
Run the multiplication yourself once by hand. For HUL it's 0.166 × 0.80 × 1.52 = 0.202, and for Walmart 0.0287 × 2.66 × 2.91 = 0.222. Now read what the arithmetic says. HUL is margin-led. Of every sales rupee, 16.6 paise survives, but each rupee of assets produces only ₹0.80 of sales a year, on a barely levered balance sheet. Its ROE is earned at the price tag, because brands let it charge far above cost. Walmart is turnover-led. Under 3 cents per dollar survives, but each dollar of assets is forced through the till 2.7 times a year. Moderate leverage amplifies the result, and it's mostly supplier credit and leases, not desperation borrowing. Walmart's ROE is earned at checkout speed.
Same destination, opposite roads, and the road tells you what to watch. HUL dies if pricing power erodes, so gross margin is its vital sign. Walmart dies if velocity stalls, so its vital signs are turnover and comparable sales. That's what "reading strategy off the arithmetic" means, and from now on you'll do it for every company you tear down.
Are the three levers equally good?
One warning before the 5-step version. The three levers aren't equally admirable. Margin and turnover are operating achievements, hard to build and hard for competitors to copy. Leverage is available to any board with a phone line to a bank. A 24% ROE built as 7.5% ROA × 3.2 leverage and a 24% ROE built as 16% ROA × 1.5 leverage are different animals wearing the same coat. Before you applaud the first one, it also has to pass the coverage tests. DuPont is there to stop you at this question.