Nine calculators, each built around one accounting formula, none of them asking for your email first.
Most "business calculator" sites bury the actual math behind a lead-capture form or a chat widget that wants your phone number before it will divide two numbers for you. BusinessCalc skips that step. Type in your revenue and costs, get your margin, close the tab.
Nine tools cover the questions that come up constantly when you run a business and only occasionally when you don't: profit margin (gross, operating, net), break-even point, markup versus margin conversions, what a contractor's rate actually nets after self-employment tax, business valuation using the SDE multiple method brokers use for owner-operated companies, plus narrower jobs like counting business days for a contract deadline, amortizing a student loan, pricing landscaping work, and running CPM math for ad buys. Seven articles walk through the formulas in more depth for anyone who wants the reasoning, not just the output.
Every formula on this site is a standard accounting or tax calculation, the same one you'd find in a small-business finance textbook. Nothing is proprietary or estimated from a black box. The editorial standards page covers where each formula comes from and how often the underlying figures, like the self-employment tax rate, get reviewed. The authors page covers who writes what.
Nothing. Every calculator runs in your browser with JavaScript; the revenue, costs, and rates you type in never get sent to a server. See the privacy policy for the specifics on analytics and ad cookies, which is a separate question from whether your inputs leave the page. They don't.
