POAS: Profit on Ad Spend as a Better North Star

POAS ties ads to profit, not revenue. Definition, formula, and when ecommerce teams should switch.

Markdown source

POAS (Profit on Ad Spend) = attributable profit ÷ ad spend. It forces the question ROAS avoids: did the ads create profit after product and selling costs, not just revenue?

The formula and why it differs from ROAS

Because POAS uses profit that already nets out COGS, fees, and shipping, it cannot be gamed by shifting spend toward whichever SKU happens to have the highest revenue-to-spend ratio.

Switching from ROAS in practice

Start by calculating POAS retroactively on last month's top-performing campaigns by ROAS. It is common to discover that several "winners" were actually break-even or worse once product-level margin enters the equation.

Operational fit

POAS is only as trustworthy as the COGS data feeding it—stale or missing per-SKU product cost will produce a POAS number that looks precise but is quietly wrong.

FAQ

What is a healthy POAS target?

It depends on category margin and growth stage—there is no universal number, but the target should map to a specific profit goal rather than a round figure picked for convenience.

Can POAS replace ROAS entirely in reporting?

Many teams keep ROAS for campaign-level bid optimization but use POAS for budget allocation and SKU-mix decisions, where profit accuracy matters most.

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CostRadar calculates POAS automatically from synced COGS, fees, and ad spend, so the switch from ROAS does not require a spreadsheet rebuild.