Ratio Analysis at a Glance
The Hook
A single number on a statement means very little on its own. Is 200,000 dollars of profit impressive? You cannot know until you ask: on how much? Ratios answer exactly that question, turning raw numbers into instant judgments, and a handful of them let you size up any company at a glance.
Plain English
Ratios are simply one number divided by another, and they exist because absolute numbers are hard to judge in isolation. They fall into four families, each answering a different question. Liquidity ratios ask: can the company pay its short-term bills? The current ratio (current assets divided by current liabilities) is the classic one. Leverage ratios ask: how much debt is the company carrying? The debt-to-equity ratio (total debt divided by equity) is the headline. Efficiency ratios ask: how well does the company use what it has? Asset turnover (revenue divided by assets) is a good example. Profitability ratios ask: how much profit does the company squeeze out, and on what base? This family includes the three return ratios: ROA (return on assets) measures profit against everything the company owns, ROE (return on equity) measures profit against what the owners put in, and ROIC (return on invested capital) measures profit against all the money invested in the business, both debt and equity. Together these four families let you read strength, risk, and quality fast.
The Math
Every ratio is profit or revenue measured against the base that produced it. The return ratios differ only by which base you use. ROA uses total assets, ROE uses owners' equity, and ROIC uses total invested capital (debt plus equity). Comparing them reveals how much of a company's returns come from genuine operating performance versus from simply borrowing a lot.
- Current ratio (liquidity) = current assets / current liabilities
- Debt-to-equity (leverage) = total debt / total equity
- Return on assets (ROA, profitability) = net income / total assets
- Return on equity (ROE, profitability) = net income / total equity
A company has current assets of 300,000 dollars and current liabilities of 150,000 dollars. Current ratio = 300,000 / 150,000 = 2.0. A current ratio of 2.0 means it has two dollars of short-term assets for every dollar of short-term bills, a comfortable cushion. Now leverage: the company has total debt of 400,000 dollars and total equity of 200,000 dollars. Debt-to-equity = 400,000 / 200,000 = 2.0. That means it carries two dollars of debt for every dollar of owners' money, which is fairly aggressive. In two quick divisions you have learned the company can cover its near-term bills but leans heavily on borrowing, two facts that no single raw number on the statement could have told you.
A company earns net income of 100,000 dollars. It has total assets of 1,000,000 dollars and total equity of 400,000 dollars (the rest is funded by debt). Return on assets (ROA) = 100,000 / 1,000,000 = 10 percent. Return on equity (ROE) = 100,000 / 400,000 = 25 percent. ROE is much higher than ROA, and the gap is the fingerprint of leverage. Because the company funded a lot of its assets with debt, the owners' smaller slice of equity earns a higher return. A wide gap between ROE and ROA is a signal: the company is using borrowed money to amplify returns, which lifts the upside but also raises the risk if things turn.
Two companies both earn 10 percent ROA, so they look equally good at a glance. Dig into efficiency with asset turnover (revenue divided by assets). Company A has revenue of 2,000,000 dollars on assets of 1,000,000, so asset turnover = 2,000,000 / 1,000,000 = 2.0. It generates two dollars of sales per dollar of assets. Company B has revenue of 500,000 dollars on the same 1,000,000 of assets, so asset turnover = 500,000 / 1,000,000 = 0.5, just fifty cents of sales per dollar of assets. Same ROA, but Company A works its assets four times harder and likely earns its returns on thinner margins through volume, while Company B relies on fatter margins on fewer sales. Efficiency ratios reveal how a company actually earns its returns, not just whether it does.
The Lingo
- Liquidity ratio
- A measure of whether a company can pay its short-term bills, such as the current ratio (current assets over current liabilities).
- Leverage ratio
- A measure of how much debt a company carries, such as debt-to-equity (total debt over total equity). Higher means more borrowing.
- Efficiency ratio
- A measure of how well a company uses what it has, such as asset turnover (revenue over assets). Higher means harder-working assets.
- Return on assets (ROA)
- Net income divided by total assets. How much profit the company earns on everything it owns.
- Return on equity (ROE)
- Net income divided by total equity. How much profit the company earns on what the owners put in.
- Return on invested capital (ROIC)
- Profit measured against all capital invested, both debt and equity. A clean read on how well the business uses its funding.
Practice
In the Room
The Trap
Reading any single ratio in isolation, especially ROE. A sky-high ROE can look like excellence when it is really just heavy borrowing, because piling on debt shrinks the equity base and inflates the return. Always pair ratios: read ROE next to ROA to see how much is leverage, and read profitability next to liquidity to make sure a profitable company can still pay its bills. And always compare to something, the company's own history or its peers, because a ratio with no benchmark is just a number. The clarifying question: high or low compared to what, and what is driving it?
Quick Check
Q1.What does a liquidity ratio like the current ratio tell you?
Q2.Current assets are 300,000 dollars and current liabilities are 150,000 dollars. What is the current ratio?
Q3.Net income is 100,000 dollars and total assets are 1,000,000 dollars. What is ROA?
Q4.A company has an ROA of 10 percent but an ROE of 25 percent. What does the gap most likely tell you?
Q5.Two companies both have a 10 percent ROA. Why might you still prefer one over the other?
Practice Out Loud
An investor says: this company has a 30 percent ROE, that settles it, let us invest. In 60 seconds, explain why ROE alone is not enough and which other ratios you would check first. The AI will push back with: are you saying a high ROE is a bad sign?
Try it in real life
This week, pick one company you follow and find one real world example of ratio analysis at a glance. Write down what you noticed in two sentences.
Wrap up this lesson
Submitting the Quick Check counts. Or mark it here when you feel ready.