ROI Calculator

Return on investment, usually shortened to ROI, compares the net gain from an activity with the amount invested in that activity. An ecommerce owner might use it for a new product order, packaging equipment, a subscription that saves labor, a website redesign, or a broader promotion where the relevant return can be estimated.

ROI provides a percentage that makes differently sized projects easier to compare. It does not automatically define which revenue or cost belongs in the comparison. The usefulness of the output depends on including realistic expenses and choosing a return amount that reflects the same period and decision as the investment cost.

Subtract investment cost from return amount to find net return. Divide that net return by investment cost, then multiply by 100. A positive result indicates the entered return exceeded investment, while a negative result indicates the project has not recovered its entered cost.

When investment cost is zero, ROI cannot be defined and the tool displays N/A. If a project continues producing benefits for many months, calculate using a clearly stated period or use more detailed finance methods where time, cash flow timing, risk, taxes, and residual value are material.

Sellers make tradeoffs with limited cash: reorder a product, test a sales channel, improve creative, or pay for operations software. ROI creates a common starting measure for those options. It is particularly useful when a high revenue project also requires a high upfront commitment and cannot be judged on sales alone.

ROI should not replace cash-flow planning, margin analysis, or ad-specific ROAS. An inventory investment may have acceptable ROI but tie up funds too long; an ad campaign may have positive ROAS but lose money after product cost. Use the calculator as an estimate, document assumptions, and verify substantial decisions against reliable financial records.