Gross Profit Margin Calculator

This calculator separates the three profit lines that a single margin figure hides. Enter revenue and cost of goods sold for the gross profit and gross margin, then add operating expenses and a tax rate to see the operating and net margins alongside it, each as a percentage of revenue. The second mode starts from units sold, selling price and direct cost per unit, and adds the gross profit per unit, the operating profit after fixed costs and the break-even point. Cost of goods sold means the direct cost of what you sold; anything that would still be owed if you sold nothing belongs in operating expenses, and putting a cost on the wrong side moves the gross margin without changing the net. The tax figure is a flat percentage of operating profit, not a tax return.