Key takeaways
- Margin is on revenue, markup is on cost. A 50% markup is a 33% margin.
- Gross, operating and net margins measure different layers and must not be mixed.
- Break-even is a range, because fixed costs are only fixed within a capacity band.
- A profitable business can fail on cash. Measure both.
- A ratio only means something in comparison, and only if defined consistently.
Margin and markup use different denominators
Gross margin divides gross profit by revenue. Markup divides the same gross profit by cost. A 50% markup does not produce a 50% margin, so label pricing targets carefully.
Break-even depends on contribution
Unit contribution is selling price less variable cost. Divide fixed costs by contribution to estimate the volume required before operating profit. Validate that costs are correctly classified for the decision horizon.
Working capital is not the same as cash
Working capital subtracts current liabilities from current assets. The current ratio divides them. Inventory and receivables may not convert to cash quickly, so review aging and liquidity alongside the headline metric.
Runway is a cash-timing estimate
Divide unrestricted cash by monthly net burn for a simple runway. A detailed forecast should model collections, payroll dates, taxes, capital purchases, financing events and seasonal changes.
Margin and markup are computed on different bases
Margin divides profit by revenue. Markup divides profit by cost. A 50% markup is a 33% margin, and confusing the two is the most consistent source of underpricing in small businesses. Because the error is proportionally larger at higher percentages, businesses that believe they are pricing at a healthy markup can discover their margin is far thinner than assumed.
Gross, operating and net margin measure different layers
Gross margin covers only direct costs and tells you whether the core offering is economically sound. Operating margin adds overhead and tells you whether the business is efficient at its current scale. Net margin adds financing, tax and unusual items. Comparing a competitor's net margin to your gross margin is meaningless, and mixing the layers is a common reason two people looking at the same accounts disagree about profitability.
Break-even is a contribution-margin calculation
Fixed costs divided by contribution margin per unit gives the volume required to cover fixed costs. The critical input is the split between fixed and variable, which is rarely clean: semi-variable costs like utilities and part-time labour behave differently across ranges, and costs treated as fixed are usually only fixed within a range of output. Break-even is therefore a range instead of a point, and it moves when capacity steps.
Profit is an opinion, cash is a fact
Accrual accounting recognizes revenue when earned and expenses when incurred, which is the right basis for measuring performance and the wrong one for surviving. A profitable business fails when receivables are slow, inventory absorbs cash, or growth requires funding working capital faster than operations generate it. Every business needs both a profit measure and a cash measure, and confusing them is the classic reason a growing company runs out of money.
Working capital and liquidity ratios describe short-term resilience
Current assets less current liabilities measures the buffer available for near-term obligations. The quick ratio strips out inventory, which matters because inventory is the current asset least likely to convert to cash quickly when it is most needed. A healthy current ratio driven entirely by slow-moving inventory can coexist with an inability to make payroll.
Burn rate and runway are estimates that should be conservative
Net burn is cash out less cash in. Runway is unrestricted cash divided by net burn. The simple calculation assumes burn stays constant, which it rarely does: hiring, seasonality, tax payments and capital purchases all move it. A runway figure is most useful when computed against a forecast that includes known lumpy outflows, and when a conservative case is run alongside the expected one.
Ratios are comparative instruments
A single ratio in isolation carries little information. Its meaning comes from comparison: to the same business over time, to industry norms, or to a plan. A margin that looks poor in one sector is strong in another, and a trend across periods usually says more than any single period's value. Consistency of definition across the comparison matters more than the precise definition chosen.
Definitions must be written down and kept stable
Whether shipping sits in cost of goods or operating expense, whether owner compensation is included, how returns and discounts are handled: these choices change every ratio downstream. They are legitimate choices. But they must be documented and applied consistently, otherwise period-to-period comparisons measure accounting changes , not business performance.
Worked with real numbers
What this looks like in the gross margin calculator
The guidance above is easier to judge against figures. Using the gross margin calculator worked example, moving cost of goods sold from $120,000 to $180,000 changes the gross margin from 28.0% to 52.0%.
| Cost of goods sold | Gross margin | Gross profit |
|---|---|---|
| $120,000 | 52.0% | $130,000 |
| $135,000 | 46.0% | $115,000 |
| $150,000 | 40.0% | $100,000 |
| $165,000 | 34.0% | $85,000 |
| $180,000 | 28.0% | $70,000 |
Open the Gross Margin Calculator to use your own numbers →
The inputs behind those figures
| Input | Value | Definition |
|---|---|---|
| Revenue | $250,000 | Enter the revenue used in your scenario. |
| Cost of goods sold | $150,000 | Enter the cost of goods sold used in your scenario. |
What goes wrong
Common mistakes
Each of these produces an answer that looks reasonable, which is why they survive review. To catch them in essential business finance ratios, rerun the gross margin calculator with a different assumption and check whether the result moves in the direction the guidance predicts, since an error that survives that test is usually in one of the inputs and not in the arithmetic.
| The mistake | Why it misleads | Do this instead |
|---|---|---|
| Pricing on markup while thinking in margin | The two are computed on different bases, and the gap widens at higher percentages. | Decide the target margin first, then derive the markup that achieves it. |
| Treating all overhead as fixed in a break-even | Semi-variable costs move with volume and fixed costs step at capacity thresholds. | Split costs into fixed, variable and semi-variable, and compute break-even as a range. |
| Managing to profit without a cash forecast | Receivables, inventory and growth in working capital consume cash that the profit figure does not show. | Run a cash forecast alongside the profit and loss, including tax and capital outflows. |
| Comparing your ratio to an industry figure defined differently | Classification choices change every downstream ratio. | Confirm the definition behind any benchmark, or compare against your own trend instead. |
People also ask
Frequently asked questions
What is the difference between margin and markup?
Margin is profit divided by revenue. Markup is profit divided by cost.
Can a business have positive working capital and low cash?
Yes. Current assets may be concentrated in inventory or receivables that are not immediately liquid.
What is the difference between margin and markup?
Margin is profit divided by revenue. Markup is profit divided by cost. An item costing 100 and selling for 150 carries a 50% markup and a 33% margin. Pricing decisions made in markup terms while targets are set in margin terms consistently produce thinner profits than intended.
How do I find my break-even point?
Divide total fixed costs by the contribution margin per unit, which is price less variable cost per unit. The result is the volume needed to cover fixed costs. The answer depends heavily on how costs are classified, so treat it as a range and re-run it when capacity or cost structure changes.
Why is my business profitable but out of cash?
Usually because profit is recognized when earned while cash arrives later, and because growth consumes working capital. Rising receivables, increasing inventory, or paying suppliers faster than customers pay you all absorb cash that the profit figure never reflects. The cash conversion cycle calculator quantifies the gap.
What is a healthy current ratio?
It depends on the sector and on what the current assets consist of. A ratio that looks comfortable but is composed mainly of slow-moving inventory offers little protection, which is why the quick ratio, excluding inventory, is often the more informative figure for near-term resilience.
How should I calculate runway?
Divide unrestricted cash by net monthly burn for a simple figure, then refine it with a forecast that includes hiring plans, seasonality, tax payments and capital purchases. The simple version assumes a constant burn, which is almost never true, so run a conservative case alongside it.
Which input moves the gross margin most in the gross margin calculator?
Ranked by how far each moves the gross margin across the range tested: revenue (12.1%, 30%) and cost of goods sold (12.0%, 30%).
How much does revenue matter in the gross margin calculator?
The worked example uses $250,000. Holding every other input at its worked-example value, moving revenue from $225,000 to $275,000 takes the gross margin from 33.3% to 45.5%, a swing of 30% of the worked-example figure.