# POAS vs ROAS: Why Profit on Ad Spend Beats Return on Ad Spend

## What is POAS?

POAS (Profit on Ad Spend) is a performance marketing metric that measures net profit generated per unit of ad spend. The formula is:

**POAS = Profit ÷ Ad Spend**

Unlike ROAS, POAS excludes cost of goods sold, margin variance, and revenue-only signals — it isolates the actual money retained after production and acquisition costs.

## What is ROAS?

ROAS (Return on Ad Spend) measures total revenue generated per unit of ad spend. The formula is:

**ROAS = Revenue ÷ Ad Spend**

ROAS treats every rupee of revenue as equal, regardless of the margin behind it.

## Why does ROAS give misleading results?

ROAS gives misleading results because it assigns identical weight to high-margin and low-margin revenue. A ₹1,000 sale on a product with 10% margin generates ₹100 profit. A ₹1,000 sale on a product with 50% margin generates ₹500 profit. Both register the same ROAS, but the business impact differs by 5x.

## How does POAS fix the ROAS blind spot?

POAS fixes the ROAS blind spot by measuring ad spend against profit instead of revenue. This means a marketer optimizing for POAS shifts ad budget toward the products that generate the most actual profit, not the products that generate the most revenue-per-rupee.

## POAS vs ROAS: comparison table

| Metric | Formula | Measures | Blind spot |
| --- | --- | --- | --- |
| ROAS | Revenue ÷ Ad Spend | Top-line return | Ignores margin differences between products |
| POAS | Profit ÷ Ad Spend | Bottom-line return | None — margin is built into the calculation |

## Example: gold jewelry vs. handmade soap

A store sells two products: gold jewelry (thin margin, ~8%) and handmade soap (thick margin, ~60%). Both products run the same ad spend and both return the same ROAS — 4x. On ROAS alone, they look identical.

POAS shows a different picture. Because soap has a much higher margin, the profit generated per rupee of ad spend is significantly higher for soap than for gold jewelry — even though ROAS is identical for both.

## Can a business lose money while ROAS looks good?

Yes. A business can show strong ROAS and still lose money if ad spend is concentrated on low-margin products. ROAS reports revenue performance, not profitability. A campaign can hit a 4x or 5x ROAS target while contributing very little — or even negative — profit, if the margin on the underlying product is thin enough.

## Core takeaway

Optimizing for ROAS optimizes for revenue. Optimizing for POAS optimizes for what reaches the bank account. For any business selling multiple products at different margins, POAS is the more accurate metric for ad spend allocation decisions.