Profitability Calculator
See exactly how profitable a business is, layer by layer. Enter revenue, cost of goods sold, operating expenses and any other income: the tool computes gross profit, operating income, net profit, each margin and return on cost invested. Add the optional tax rate and interest expense for a full profit-and-loss view.
Planning estimate only. ROI here means return on cost invested (net profit relative to COGS plus operating expenses), not return on total business assets.
Worked example, checked against this exact tool
Revenue $250,000, COGS $100,000, operating expenses $60,000, other income $5,000, tax 21%: gross profit = 250,000 − 100,000 = $150,000 (60.00% margin). Operating income = 150,000 − 60,000 = $90,000 (36.00%). Pre-tax = 90,000 + 5,000 = $95,000; net profit after 21% tax = $75,050 (30.02% net margin). ROI on costs = 75,050 ÷ 160,000 = 46.91%.
What each layer tells you
Gross profit (revenue minus COGS) shows pricing power and production efficiency. Operating income subtracts overhead like salaries, rent and marketing, revealing whether the core business works. Net profit is the bottom line after interest, other income and tax. A healthy gross margin with a weak net margin means overhead or financing, not pricing, is the leak.
Margin vs markup: do not mix them up
Margin is profit as a share of revenue; markup is profit as a share of cost. A product that costs $60 and sells for $100 has a 40% margin but a 66.67% markup. Quotes and supplier negotiations usually talk markup; financial statements talk margin. This tool reports margins.
How to read the ROI figure
The ROI shown is net profit divided by the costs you put in (COGS plus operating expenses): for every dollar of cost, how many cents of net profit came back. It is useful for comparing product lines or campaigns, but it is not return on equity or return on assets, which need balance-sheet figures this tool does not ask for.
What competing calculators miss
Most margin tools stop at gross and net margin from two inputs. The deepest competitor adds interest and tax layers with a worked example. This page matches that depth with optional interest and tax inputs, keeps the simple four-input default for quick checks, and adds the one metric none of them show: return on cost invested, so you can compare where each dollar of spending works hardest.
Frequently asked questions
How do you calculate profitability?
Start with revenue, subtract cost of goods sold for gross profit, subtract operating expenses for operating income, then adjust for interest, other income and tax for net profit. Each margin is that profit divided by revenue, times 100.
What is a good gross profit margin?
It varies by industry: software often runs 70 to 85%, retail 25 to 40%, restaurants 60 to 70% on food before labor. Compare against your own history and direct competitors, not a universal number.
What is the difference between gross margin and net margin?
Gross margin uses gross profit (revenue minus COGS) over revenue; net margin uses net profit (after all expenses, interest and tax) over revenue. Net margin is always lower and shows true bottom-line efficiency.
What is operating income?
Revenue minus COGS minus operating expenses (salaries, rent, marketing, admin). It measures the core business before financing and tax decisions.
How is ROI calculated here?
Net profit divided by (COGS + operating expenses), times 100. It answers: for each dollar of operating cost, how much net profit was produced.
Should I include tax in profitability?
For a true bottom line, yes: enter your effective tax rate in the optional field. For comparing operations across periods or businesses, pre-tax figures are often cleaner.
What counts as cost of goods sold?
Direct costs of producing what you sell: materials, direct labor, manufacturing overhead, shipping to customers. Salaries for admin, marketing and rent go under operating expenses, not COGS.
Why is my gross margin high but net margin low?
Overhead is eating the difference: operating expenses, interest or tax. That pattern points at cost control and financing, not pricing.
Can profitability be negative?
Yes. If costs exceed revenue, margins go negative, which the tool reports plainly. Negative net margin with positive gross margin is a classic sign of an overhead problem.
How often should I check profitability?
Monthly for operating decisions, quarterly for trends. Watch margin direction over time more than any single month’s absolute number.