Financial ratios compare related figures to help managers investigate business performance. They are useful starting points for questions, not automatic judgments. A ratio needs a consistent definition, reliable inputs and context about the operating model.
Profitability
Net profit margin is net income divided by revenue, commonly expressed as a percentage. In an illustrative example, $300,000 of net income on $5 million of revenue gives a 6% margin. A change can reflect pricing, costs, product mix or unusual items, so the next step is to inspect the cause.
Gross margin compares revenue less cost of sales with revenue. Confirm what the business includes in cost of sales before comparing periods or organizations. A different classification can make two apparently similar margins misleading.
Liquidity
The current ratio compares current assets with current liabilities. The quick ratio uses a narrower set of liquid assets, generally excluding inventory and prepaid expenses. State the chosen definition so comparisons use the same components.
There is no universal ratio that proves a business can pay every bill. Receivable quality, inventory movement and the timing of obligations matter. Review the cash forecast alongside balance-sheet ratios.
Efficiency
Inventory turnover commonly divides cost of sales by average inventory. Asset turnover compares revenue with average total assets. A change may indicate improved use of resources, but it can also reflect stock shortages, asset sales or timing. Ask what operational change produced the movement.
Debt and interest
Debt-to-equity compares a defined measure of debt with equity. Some reports use total liabilities and others use interest-bearing debt, so the label alone is insufficient. Negative or very small equity can make the result difficult to interpret.
Interest coverage commonly compares earnings before interest and tax with interest expense. It provides one view of financing capacity but does not show all principal repayments or future cash needs.
Returns
Return on assets commonly compares net income with average assets, while return on equity compares net income with average equity. Use consistent periods and definitions. Whole-company figures may not transfer directly to a department that does not own the relevant assets, financing or tax decisions.
Use a small set together
Compare ratios over time, investigate material changes and read the underlying statements and notes. Benchmarks should reflect comparable businesses and definitions. A margin improvement that damages service or a liquidity improvement driven by unsold stock deserves further examination. Good analysis connects the number to the decision it can inform.