POAS (Profit on Ad Spend)

What Is POAS?

Many advertisers optimize for ROAS and overlook the fact that high-revenue products aren’t automatically profitable. POAS solves this problem by factoring in purchase prices, shipping costs, and returns. When you pass POAS as a conversion value to Google Ads, Smart Bidding optimizes not for revenue but for actual profit — which can significantly increase your profitability.

POAS (Profit on Ad Spend) is an evolution of the classic ROAS and measures the actual profit per invested advertising dollar. While ROAS sets revenue against advertising costs, POAS takes into account actual margins, product costs, and operational expenses. A ROAS of 500 percent sounds impressive, but can still be unprofitable for products with low margins.

The calculation is simple: POAS = Profit / Ad Spend. A POAS of 1.0 means break-even; anything above is profitable. The challenge lies in data provision: you must transmit profit per conversion to Google instead of revenue. This requires either adjusted conversion values in tracking or the use of Conversion Value Rules to convert revenue values to a profit basis.

For practice, POAS is the more honest metric. A product with 80 percent margin can tolerate a lower ROAS than a product with 10 percent margin. When you feed Value-Based Bidding with profit data instead of revenue data, Smart Bidding automatically optimizes for POAS. This is particularly relevant for stores with heterogeneous margins. Switching from ROAS to POAS optimization requires clean margin data from your ERP or inventory management system.