Cash Flow & Earnings Quality: The Full Ratio Lab

Why does operating cash flow matter so much?

Net income is an accounting number, and it shouldn’t be trusted blindly on its own. Earnings quality is measured by comparing net income to actual operating cash flow:

Earnings Quality Ratio = Operating Cash Flow ÷ Net Income

If this ratio is below 1 and declining over time, that’s an important warning sign: the company is booking accounting profit but not converting it into real cash — often due to a buildup in inventory or slow customer collections (accounts receivable). This is one of the most common early warning signs of financial trouble at many companies.

Return on Equity (ROE)

ROE = Net Income ÷ Total Equity

Measures how efficiently a company turns shareholders’ money into profit. Useful for comparing companies, but be careful: a heavily debt-financed company can show a high ROE not because it’s efficient, but simply because its equity base is small — always look at it alongside the leverage ratio.

Try it yourself

Change the company’s numbers below and watch every ratio (liquidity, leverage, profitability, earnings quality) update together instantly, with a rough color-coded guide for each.

Company Numbers

Current Assets400,000Current Liabilities250,000Inventory120,000Total Debt300,000Total Equity500,000Revenue1,200,000COGS750,000Net Income90,000Operating Cash Flow130,000

Calculated Ratios

Current Ratio

1.6xHealthy

Quick Ratio

1.12xHealthy

Debt ÷ Equity

0.6xHealthy

Gross Margin

37.5%

Net Margin

7.5%Worth watching

Return on Equity (ROE)

18%Healthy

Earnings Quality (OCF ÷ Net Income)

1.44xHealthy

Colors here are rough rules of thumb only — the real benchmark varies by industry.

Ready to apply this analysis to a real company across two years? Head to the case study.