CFO's Guide to Advertising Metrics
POASvsROAS
The definitive comparison of Profit on Ad Spend versus Return on Ad Spend. Why CFOs prefer POAS and how a 4x ROAS can still mean break-even.
What is the difference between POAS and ROAS?
POAS (Profit on Ad Spend) measures the gross profit generated per pound spent on advertising. ROAS (Return on Ad Spend) measures only the revenue generated.
The critical difference: ROAS ignores product margins. A 4x ROAS on a 25% margin product equals break-even, returning zero profit. POAS reveals true advertising profitability by accounting for the actual costs of goods sold.
The Formulas
ROAS
Formula
Revenue ÷ Ad Spend
Why It Matters
Shows top-line efficiency but ignores margins. A high ROAS can still mean losing money on every sale if product costs exceed the revenue margin.
Example
£10,000 revenue ÷ £2,500 ad spend = 4x ROAS
POAS
Formula
Gross Profit ÷ Ad Spend
Why It Matters
Reveals true advertising profitability. Accounts for COGS, ensuring every pound spent on advertising generates actual commercial return.
Example
£2,500 gross profit ÷ £1,000 ad spend = 2.5x POAS
Side-by-Side Comparison
How POAS and ROAS compare across key decision criteria.
POAS vs ROAS Feature Comparison
| Feature | ROAS | POAS |
|---|---|---|
| What it measures | Revenue generated | Profit generated |
| Accounts for product margins | ||
| Shows true commercial return | ||
| CFO-friendly reporting | ||
| Platform-native metric | ||
| Quick benchmark comparison | With setup | |
| Prevents hidden losses | ||
| SKU-level decision making | Misleading | Accurate |
For commercial decision-making, POAS provides the accuracy that finance teams require.
Real Example: When 4x ROAS Means Break-Even
The ROAS View
Product Price: £100
Ad Spend: £25
Revenue Generated: £100
ROAS: 4x ✓
Looks great in the dashboard
The POAS Reality
Product Price: £100
COGS (75%): -£75
Gross Profit: £25
Ad Spend: -£25
Net Profit: £0
Break-even at best
The takeaway: A 4x ROAS on a 25% margin product generates zero profit. Only POAS reveals this truth before it damages your P&L.
Why CFOs Prefer POAS
P&L Integration
POAS uses the same language as finance: profit, margin, contribution. It connects marketing to the P&L rather than existing in a parallel reporting universe.
Board Defensibility
When asked 'What did we get for our ad spend?', POAS provides an answer that finance understands: actual pounds of profit generated.
SKU-Level Decisions
POAS enables accurate decisions about which products deserve ad spend. ROAS treats all revenue equally, hiding the margin differences that determine profitability.
Frequently Asked Questions
What is the difference between POAS and ROAS?
POAS (Profit on Ad Spend) measures gross profit generated per pound of advertising, while ROAS (Return on Ad Spend) measures revenue. A 4x ROAS on a 25% margin product equals break-even, returning zero profit. POAS reveals true advertising profitability by accounting for product costs and margins.
Why do CFOs prefer POAS over ROAS?
CFOs prefer POAS because it connects advertising to the P&L. ROAS can show impressive numbers while the business loses money on every sale. POAS uses the same language as finance teams: profit, contribution margin, and commercial return. It makes advertising investment defensible in board meetings.
How do you calculate POAS?
POAS is calculated by dividing gross profit by advertising spend. For example, if you spend £1,000 on ads and generate £2,500 in gross profit (revenue minus COGS), your POAS is 2.5x. This means you're making £2.50 in profit for every £1 spent on advertising.
What is a good POAS target?
A good POAS target depends on your business model and overhead structure. Generally, a POAS above 1.5x indicates healthy profitability. Subscription businesses with high LTV may accept lower initial POAS. The key is that POAS must cover your operating costs and desired profit margin.
Can ROAS ever be useful?
ROAS is useful for platform-level efficiency tracking and quick benchmarking, but it should never be the primary decision metric. Use ROAS as a directional indicator, but make budget and bidding decisions based on POAS or contribution margin to ensure commercial viability.
When to Use Each Metric
Use ROAS When…
- •Quick-benchmarking platform efficiency across campaigns
- •Comparing performance across similar-margin product groups
- •Reporting to stakeholders who only need directional trends
- •You sell a single product with uniform margins
Use POAS When…
- Making budget allocation or bidding decisions
- Reporting to CFOs, boards, or finance teams
- Managing SKUs with different margin profiles
- Deciding which products deserve ad spend
- Scaling campaigns without destroying profitability
Related Resources
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