Return on Ad Spend (ROAS) Calculator

Return on ad spend, or ROAS, compares revenue attributed to advertising with the direct media spend used to generate it. The multiple equals attributed revenue divided by ad spend. A campaign producing $5,000 of revenue from $1,000 of spend has a 5.00 ROAS, often written as 5:1. Expressed as a percentage, the same result is 500 percent. ROAS describes gross revenue efficiency, not investment profit. Attribution must be consistent. Revenue and spend should cover the same campaign, channels, geography, and conversion window. Platforms may claim the same conversion, view-through rules can assign revenue without a click, and privacy limits can leave some sales unobserved. Comparing platform dashboards without reconciling attribution settings can therefore overstate total incremental revenue. Controlled experiments, holdouts, media-mix models, or carefully designed first-party tracking may provide a stronger view of causality. Optional funnel metrics add context. Cost per conversion equals spend divided by conversions. Cost per click equals spend divided by clicks. Conversion rate equals conversions divided by clicks. A high ROAS with few conversions may not scale, while a low cost per click can still be unprofitable if traffic does not convert. The conversion definition should represent a meaningful action and remain consistent across campaigns. A 1.00 ROAS means attributed revenue equals ad spend, but it is usually below economic break-even. Product cost, fulfillment, payment fees, discounts, returns, agency fees, creative production, and overhead still need to be covered. If contribution margin before advertising is 40 percent, a rough revenue break-even ROAS is 1 divided by 0.40, or 2.5. Customer lifetime value can justify lower first-purchase ROAS only when repeat behavior, margin, and retention are measured reliably. Use ROAS with incremental profit, acquisition cost, average order value, lifetime value, volume, and confidence in attribution. Segment by channel, audience, creative, product, and new versus returning customers. Short windows can favor fast-converting tactics and undervalue brand activity, while long windows can capture unrelated demand. The calculator subtracts ad spend from revenue for a simple bridge but deliberately labels it revenue less spend, not profit. It is a diagnostic for campaign comparison and planning, not proof that advertising caused every reported sale or that a campaign created shareholder value.