Break-Even ROAS & POAS
The formula that tells you if you can actually afford to scale. Plus POAS: the metric that replaces ROAS for serious brands.
1. The ROAS Lie
Platform ROAS = Revenue / Ad Spend. That's it. It ignores every cost in your business.
Example: your CM2 margin is 49%. Your break-even ROAS is 1 / 0.49 = 2.04x.
Your platform says 3x ROAS. You think you're printing money. But if your break-even is 2.8x, you're barely surviving. The gap between "looks profitable" and "is profitable" kills brands.
2. The Formula, Step by Step
No shortcuts. Real numbers.
The leverage point
A 5% improvement in COGS drops your break-even from 2.8x to 2.2x. That's like getting 20% more efficient without touching a single ad. Fix your costs before you optimize your campaigns.
3. ROAS Headroom
This number tells you if you can scale. It's the gap between where you are and where you break even.
Fragile. Don't scale.
One bad week or seasonal CPM spike wipes your margins. Fix costs first.
Scale carefully.
You have a buffer but not much. Increase budget in small steps. Monitor weekly.
Green light.
Healthy headroom. You can absorb efficiency dips when scaling. Push harder.
4. POAS: The Next Level
Profit on Ad Spend. Not Revenue on Ad Spend. This is where serious brands operate.
Why POAS beats ROAS
Break-even is always 1.0
Dead simple. No margin math needed. If POAS is above 1, you're making money.
Accounts for product-level margins
A €200 order with 20% margin and a €50 order with 60% margin are very different. ROAS treats them the same. POAS doesn't.
Stops chasing bad revenue
Those high-revenue, low-margin orders that look good on your ROAS dashboard? POAS ignores them. Because they don't make you money.
How it works in practice
ProfitMetrics and KickBite send actual profit to Google and Meta via server-side tracking. Your Smart Bidding optimizes for profit, not revenue. The algorithm chases the orders that actually make you money.
When to implement POAS
When you have variable margins across products and Smart Bidding keeps chasing the wrong orders. If all your products have similar margins, ROAS and POAS will give you similar results. No need to overcomplicate.
POAS target of 1.5 means you want €1.50 profit for every €1 spent. Clean. Simple.
Credit: ProfitMetrics pioneered POAS bidding. If you're ready for this level, check them out.
The CMO Lens
Knowing your break-even is table stakes. A CMO uses it as a decision filter every week. Should we launch that campaign? Check break-even first. Should we test that new channel? What headroom do we need? The formula is simple. Making it the default lens for every spending decision is what separates operators from optimizers.
Calculate Your Break-Even
Plug in your numbers. See your break-even. Know your headroom. Takes 60 seconds.