The right calculator,right when you need it.

FBM Calculators Hub brings 25 free business, freelance, and marketing calculators into one practical library for freelancers, founders, small-business owners, and campaign teams. Use them to check profit margin, markup, break-even revenue, ROI, ROAS, customer acquisition cost, freelance rates, project prices, billable hours, CPM, CPC, CTR, conversion rate, and more. Every calculator works without an account, and your inputs stay in your browser.

Each tool shows the formula behind the result, explains every input, walks through a worked example, and calls out common mistakes and practical limits. That transparency makes it easier to verify the calculation, compare assumptions, and understand what the answer can—and cannot—tell you before you use it in a pricing, budgeting, hiring, or campaign decision.

Choose a category below or open a calculator directly from the homepage. The tools are free, require no signup, and use one consistent format so you can move from a quick estimate to the supporting method without hunting through hidden steps.