Why Financial Ratios Matter in IB Interviews
Financial ratios are the language of fundamental analysis. In investment banking interviews, you will be expected to calculate, interpret, and compare ratios across companies fluently. Interviewers use ratio questions to test whether you actually understand financial statements -- not just the definitions, but how the numbers connect across the income statement, balance sheet, and cash flow statement.
This cheat sheet covers every ratio category you are likely to encounter: liquidity, profitability, leverage, efficiency, and valuation. For each ratio, we provide the formula, what it measures, and how to interpret it in the context of an interview question.
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Liquidity Ratios
Liquidity ratios measure a company's ability to meet its short-term obligations. These ratios answer a simple question: can the company pay its bills over the next 12 months?
Current Ratio
Formula: Current Assets / Current Liabilities
The current ratio is the most basic liquidity measure. A ratio above 1.0 means the company has more current assets than current liabilities -- it can theoretically cover its near-term obligations. A ratio below 1.0 is a warning sign, though it is not necessarily fatal (some businesses with strong cash flow generation operate with low current ratios).
Interview context: A healthy current ratio varies by industry. Retailers may operate at 1.0-1.5x, while capital-light software companies might carry 2.0-3.0x. Always compare to industry peers rather than citing a universal "good" number.
Quick Ratio (Acid-Test Ratio)
Formula: (Current Assets - Inventory) / Current Liabilities
The quick ratio strips out inventory, which is the least liquid current asset. This gives a more conservative picture of short-term liquidity. It is especially relevant for companies with large or slow-moving inventory (retailers, manufacturers).
Interview context: If an interviewer asks for a "more conservative" liquidity measure, the quick ratio is your answer. A quick ratio of 1.0 or above generally indicates solid short-term liquidity.
Cash Ratio
Formula: (Cash + Cash Equivalents) / Current Liabilities
The most conservative liquidity measure. It only counts cash and cash equivalents -- no receivables, no inventory. This ratio tells you whether the company could pay off all current liabilities immediately with cash on hand.
Interview context: Very few companies maintain a cash ratio above 1.0 because holding that much cash is inefficient. This ratio is most useful for distressed companies where you want to know the absolute floor of liquidity.
Profitability Ratios
Profitability ratios measure how effectively a company converts revenue into profit at various levels of the income statement. These are among the most frequently tested ratios in interviews.
Gross Margin
Formula: (Revenue - COGS) / Revenue
Gross margin tells you how much profit a company retains after accounting for the direct costs of producing its goods or services. It reflects pricing power, production efficiency, and input cost management.
Interview context: Gross margins vary enormously by industry. Software companies can have 80%+ gross margins, while grocery retailers operate at 25-30%. Always frame your analysis relative to the industry.
Operating Margin (EBIT Margin)
Formula: Operating Income (EBIT) / Revenue
Operating margin captures profitability after accounting for both COGS and operating expenses (SG&A, R&D). It measures how efficiently a company runs its core business operations, excluding the effects of capital structure and taxes.
Interview context: Operating margin is a better measure than gross margin for comparing companies with different operating cost structures. A company with high gross margins but bloated SG&A will have a lower operating margin -- and that tells you something important about management efficiency.
Net Profit Margin
Formula: Net Income / Revenue
Net margin is the bottom line -- what percentage of each revenue dollar ultimately flows to shareholders after all expenses, interest, and taxes. It captures everything: operational efficiency, capital structure decisions, and tax management.
Interview context: Net margin is affected by leverage (interest expense) and tax rates, making it less useful for comparing companies with different capital structures. Use operating margin for cleaner comparisons.
Return on Equity (ROE)
Formula: Net Income / Shareholders' Equity
Return on equity measures how effectively a company uses shareholder capital to generate profit. A high ROE indicates efficient use of equity capital.
Interview context: ROE can be misleading for highly leveraged companies. A company with very little equity (lots of debt) will show a high ROE even if its operations are mediocre. Use the DuPont decomposition (ROE = Net Margin x Asset Turnover x Equity Multiplier) to diagnose whether high ROE is driven by operational excellence or financial leverage.
Return on Assets (ROA)
Formula: Net Income / Total Assets
ROA measures how efficiently a company uses its total asset base to generate profit. Unlike ROE, it is not affected by capital structure because it looks at total assets regardless of how they are financed.
Interview context: ROA is better for comparing companies with different leverage levels. A company with 5% ROA and conservative leverage may actually be a better operator than a competitor with 15% ROE that is loaded with debt.
Return on Invested Capital (ROIC)
Formula: NOPAT / Invested Capital, where NOPAT = EBIT x (1 - Tax Rate) and Invested Capital = Total Equity + Total Debt - Cash
ROIC is the gold standard profitability metric for fundamental analysis. It measures the return a company earns on all capital invested in the business, stripping out the effects of capital structure and excess cash.
Interview context: Compare ROIC to the company's WACC. If ROIC > WACC, the company is creating economic value. If ROIC < WACC, it is destroying value -- even if it appears profitable on a net income basis.
Leverage Ratios
Leverage ratios measure a company's debt load and its ability to service that debt. These are critical in credit analysis and heavily tested in LevFin and restructuring interviews.
Debt-to-Equity Ratio
Formula: Total Debt / Total Shareholders' Equity
The debt-to-equity ratio is the most straightforward measure of financial leverage. It tells you how much debt a company uses relative to equity to finance its operations.
Interview context: Higher ratios indicate more aggressive use of leverage. What counts as "high" depends on the industry -- utilities and REITs routinely carry higher D/E ratios than technology companies because their cash flows are more stable and predictable.
Debt-to-EBITDA (Total Leverage)
Formula: Total Debt / EBITDA
This is the most commonly used leverage metric in leveraged finance and credit analysis. It tells you how many years of EBITDA it would take to pay off all debt, assuming no other uses of cash.
Interview context: In LBO analysis, a typical leveraged buyout might target 4.0-6.0x Debt/EBITDA for the initial capital structure. Investment-grade companies usually carry 1.0-3.0x. Anything above 6.0x is considered very highly leveraged.
Net Debt-to-EBITDA
Formula: (Total Debt - Cash and Cash Equivalents) / EBITDA
Net leverage is a more accurate picture of a company's debt burden because it accounts for cash that could be used to pay down debt immediately.
Interview context: Always specify whether you are discussing gross or net leverage. A company with 5.0x gross leverage but 3.0x net leverage has a significant cash cushion that changes the credit picture.
Interest Coverage Ratio
Formula: EBIT / Interest Expense
The interest coverage ratio measures a company's ability to pay interest on its outstanding debt from operating income. A higher ratio means the company has more cushion.
Interview context: An interest coverage ratio below 1.5x is a red flag -- the company has very little margin for error in making its interest payments. Below 1.0x means the company cannot cover its interest expense from operations, which is unsustainable. Investment-grade companies typically maintain coverage above 3.0x.
Fixed Charge Coverage Ratio
Formula: (EBIT + Fixed Charges) / (Interest Expense + Fixed Charges)
This is a broader version of the interest coverage ratio that includes lease payments and other fixed obligations. It provides a more comprehensive view of a company's ability to meet all of its fixed financial commitments.
Efficiency Ratios
Efficiency ratios (also called activity ratios) measure how well a company manages its assets and working capital. They are especially important for analyzing retailers, manufacturers, and other asset-intensive businesses.
Inventory Turnover
Formula: COGS / Average Inventory
Measures how many times a company sells and replaces its inventory during a period. Higher turnover indicates more efficient inventory management.
Interview context: Amazon might turn inventory 8-10x per year, while a luxury goods company might turn it 2-3x. The key is comparing to peers within the same industry.
Days Sales Outstanding (DSO)
Formula: (Accounts Receivable / Revenue) x 365
DSO measures the average number of days it takes to collect payment after a sale. Lower DSO means faster collection and better working capital efficiency.
Interview context: DSO is a key driver of working capital in financial models. If an interviewer asks you to project working capital, you will use DSO (along with DIO and DPO) to forecast receivables.
Days Inventory Outstanding (DIO)
Formula: (Inventory / COGS) x 365
DIO measures how many days of inventory a company holds on average. Lower DIO indicates faster inventory turnover.
Days Payable Outstanding (DPO)
Formula: (Accounts Payable / COGS) x 365
DPO measures how long a company takes to pay its suppliers. Higher DPO means the company is holding onto cash longer, which benefits working capital.
Cash Conversion Cycle (CCC)
Formula: DSO + DIO - DPO
The cash conversion cycle combines all three working capital metrics into a single number representing the number of days between paying suppliers and collecting from customers. A shorter CCC means the business generates cash more efficiently.
Interview context: Negative CCC is possible and desirable -- Amazon famously operates with a negative CCC because it collects from customers before paying suppliers. This is a competitive advantage because the business is effectively funded by its suppliers.
Valuation Ratios (Multiples)
Valuation ratios are the backbone of comparable company analysis. You must know these cold for any IB interview.
EV/EBITDA
Formula: Enterprise Value / EBITDA
EV/EBITDA is the most widely used valuation multiple in investment banking. It is capital-structure-neutral (since EV includes debt) and not distorted by depreciation policies or tax differences across jurisdictions.
Interview context: Typical EV/EBITDA multiples range from 6-8x for mature industrial companies to 15-25x+ for high-growth technology companies. Always explain why you are using EV/EBITDA rather than P/E when asked -- the capital structure neutrality is the key advantage.
EV/Revenue
Formula: Enterprise Value / Revenue
Used for companies that are not yet profitable or where margins are expected to change significantly. Common in early-stage technology and biotech valuation.
Interview context: EV/Revenue is a blunt instrument because it ignores profitability entirely. A company trading at 5x revenue with 50% margins is very different from one at 5x revenue with 10% margins. Use EV/Revenue when EBITDA-based multiples are not meaningful.
P/E Ratio
Formula: Share Price / Earnings Per Share
The P/E ratio is the most commonly cited valuation metric in public markets. It tells you how much investors are paying per dollar of earnings.
Interview context: P/E is an equity value metric (numerator is share price, which represents equity value per share), while EV/EBITDA is an enterprise value metric. Never mix enterprise and equity metrics -- this is a classic interview trap. High P/E can mean the market expects high future growth, or it can mean earnings are temporarily depressed.
P/B Ratio (Price-to-Book)
Formula: Share Price / Book Value Per Share
P/B is most relevant for financial institutions (banks, insurance companies) where book value is a meaningful representation of the asset base. A P/B below 1.0 suggests the market values the company at less than its accounting net worth.
PEG Ratio
Formula: P/E Ratio / Earnings Growth Rate
PEG adjusts the P/E ratio for growth, providing a more apples-to-apples comparison between companies growing at different rates. A PEG of 1.0 is often cited as "fair value," with below 1.0 suggesting undervaluation.
Summary Table: Key Ratios at a Glance
| Category | Ratio | Formula | What It Measures | |----------|-------|---------|-----------------| | Liquidity | Current Ratio | Current Assets / Current Liabilities | Short-term solvency | | Liquidity | Quick Ratio | (Current Assets - Inventory) / Current Liabilities | Conservative liquidity | | Profitability | Gross Margin | (Revenue - COGS) / Revenue | Production efficiency | | Profitability | ROE | Net Income / Equity | Equity efficiency | | Profitability | ROIC | NOPAT / Invested Capital | Value creation | | Leverage | D/E | Total Debt / Equity | Financial leverage | | Leverage | Debt/EBITDA | Total Debt / EBITDA | Debt capacity | | Leverage | Interest Coverage | EBIT / Interest Expense | Debt service ability | | Efficiency | CCC | DSO + DIO - DPO | Working capital efficiency | | Valuation | EV/EBITDA | Enterprise Value / EBITDA | Relative valuation | | Valuation | P/E | Price / EPS | Equity valuation |
How to Use This Cheat Sheet
Do not try to memorize every formula in isolation. Instead, build intuition for how ratios connect:
- Profitability ratios flow from the income statement
- Liquidity and leverage ratios come from the balance sheet (with some income statement inputs)
- Efficiency ratios bridge the income statement and balance sheet
- Valuation ratios combine market data with financial statement data
In interviews, the best candidates do not just recite formulas. They explain what drives changes in a ratio, how it compares across industries, and what it implies about the company's strategy and financial health.
Start drilling these ratios with our flashcard system. Practice current ratio, debt-to-equity, EV/EBITDA, and all the other core metrics until the formulas and interpretations are second nature.
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