Side-by-side: what each metric answers
Ask ROAS: “How much revenue did ads drive per dollar?” Ask POAS: “How much gross profit did ads drive per dollar?” The first supports growth narratives. The second supports sustainable growth.
Impact on Smart Bidding and tROAS
Google’s Target ROAS optimizes toward conversion value. If values are revenue-based, the algorithm chases top-line. If values are profit-based (POAS-weighted), the same tROAS target chases margin.
This is the highest-leverage upgrade most stores miss: not a new campaign structure, but honest conversion values from ERP or store COGS data.
Recommended workflow for marketing + finance
Report ROAS weekly for familiarity. Review POAS daily for activation decisions. Align promo calendars with POAS floors so merchandising and ads do not fight.
- Monday: POAS by campaign — pause or trim sub-100% POAS tests.
- Wednesday: SKU-level POAS — adjust feeds and A/C/X labels.
- Friday: ROAS + POAS summary for leadership — show revenue and profit efficiency.
POAS vs ROAS at a glance
| ROAS | POAS | |
|---|---|---|
| Formula | Revenue ÷ ad spend | Gross profit ÷ ad spend |
| Best for | Reporting, top-line growth | Bidding, budgets, SKU decisions |
| Data needed | Conversion value (often revenue) | COGS, fees, shipping, refunds |
| Risk | Over-scales low-margin SKUs | Needs accurate cost data |
| Smart Bidding | Optimizes to revenue values | Optimizes to profit values |
Frequently asked questions
Common questions about this topic — tap to read answers.
Can POAS be higher than ROAS numerically?
They are different units (profit/spend vs revenue/spend). A 180% POAS can coexist with 350% ROAS on the same account — compare trends, not absolute numbers to each other.
Which metric should agencies bill against?
Agencies often contract on ROAS for simplicity. Progressive agencies add POAS or profit KPIs to align incentives with client margin.
