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ROAS is not enough: profit margin and break-even ROAS
7 minutes · 9 steps · workout 3 of 6 in this module
What you'll be able to do
By the end of this workout, you'll be able to calculate break-even ROAS from gross margin, turn a campaign's ROAS into actual profit, and explain why platform-reported ROAS needs a second check.
A first look: Revenue pays for the product first. Ads get what's left
ROAS = revenue from ads ÷ ad spend. It's the easiest number to read on Meta and Google, and the easiest to misread, because revenue isn't profit. First find your gross margin: (price − product cost − shipping − payment and marketplace fees) ÷ price. That's the share of every sale you can actually spend on ads. Break-even ROAS = 1 ÷ gross margin. Below it you lose money on every order; above it you make money. On Amazon the same idea is shown upside down as ACoS (ad spend ÷ revenue); break-even ACoS is simply your margin.
Example: Green Garden's serum: price $40, product $10, shipping and fees $5. Margin = (40 − 10 − 5) ÷ 40 = 62.5%. Break-even ROAS = 1 ÷ 0.625 = 1.6. A ROAS of 2.0 that loses money for Northpack makes money for Green Garden.
What this workout covers
- Revenue pays for the product first. Ads get what's left
- Case: Two campaigns, one budget: which one made more money?
- The ROAS the platform shows you is not the whole story
- Case: Meta says 4.0, the bank account says otherwise
- Set complete: three numbers to keep next to ROAS
A question from this workout: Two campaigns, one budget: which one made more money?
Northpack ran two campaigns with $2,000 each. Campaign A sold backpacks (gross margin 40%). Campaign B sold accessories: cable organizers and packing cubes (gross margin 60%). The media buyer wants to move all the budget to Campaign A because “its ROAS is way higher.”
- Campaign A spend / revenue
- $2,000 / $6,400
- Campaign A ROAS
- 3.2
- Campaign B spend / revenue
- $2,000 / $4,400
- Campaign B ROAS
- 2.2
Which campaign produced more profit after ad spend?
- Campaign A: $6,400 × 0.40 − $2,000 = $560
- Campaign A, because a ROAS of 3.2 always beats 2.2
- They're equal, the spend was the same
- Campaign B: $4,400 × 0.60 − $2,000 = $640
Pick your answer first, then open the reasoning below.
Show the answer and the reasoning
Answer: D. Campaign B: $4,400 × 0.60 − $2,000 = $640
Profit = revenue × margin − spend. A: $6,400 × 0.40 − $2,000 = $560. B: $4,400 × 0.60 − $2,000 = $640. The lower-ROAS campaign made $80 more because its products keep more of every dollar. The most common mistake is comparing ROAS across products with different margins. ROAS only ranks campaigns fairly when the margin is the same.
The other steps work the same way: you decide first, then see why each option is right or wrong.
How you practice here
- 3 short concept cards
- 1 multiple-choice question
- 2 campaign cases with real-looking numbers
- 3 guided calculations
Part of the module: Marketing Metrics and KPIs
Knowing which numbers really matter: choosing KPIs, unit economics, profitability and setting realistic targets.
More workouts in this module
- Metric or KPI? Numbers tied to a goal
- CAC, LTV and payback period
- The North Star metric and the metric tree
- Vanity metrics: the likes and followers trap
- Setting realistic targets: past data, seasonality and budget
Programs that include this workout