Profit on Ad Spend (PoAS) is a marketing metric used to evaluate the profitability of an advertising campaign. Unlike traditional metrics that focus on revenue or return on investment (ROI), PoAS specifically measures the net profit generated from advertising spending. This metric helps businesses understand the true effectiveness of their ad campaigns in terms of actual profit, rather than just revenue or gross returns, providing a more accurate picture of campaign performance and financial impact.

For example, a retailer may calculate the PoAS for an online ad campaign to determine whether the profits generated from increased sales due to the campaign justify the advertising expenses.