ACOS Break-Even Calculator
Most operators optimise toward a category-average ACOS — without checking whether that number even fits their unit economics. This calculator gives you your real break-even ACOS based on your actual sell price, COGS, FBA fees and target margin. The number you get is the number you should be running campaigns toward.
Your unit economics
Enter your numbers.
Your break-even ACOS
Target ACOS
26.0%
Run at this ACOS to keep ~20% margin
Gross profit / unit
$13.79
46.0% of sell price
Profit-per-unit sensitivity
What you actually keep at different ACOS levels.
| ACOS | Ad spend / unit | Profit / unit |
|---|---|---|
| 5% | $1.50 | +$12.29 |
| 15% | $4.50 | +$9.29 |
| 25% | $7.50 | +$6.29 |
| 35% | $10.50 | +$3.30 |
| 46%Break-even | $13.80 | $-0.00 |
How to use it
Numbers are a starting point.
A conversation gets you to the answer.
This tool models the maths cleanly, but every brand has category-specific quirks the model can't see — competitive intensity, seasonal skew, catalogue depth, launch stage. If you'd like a senior view on how the numbers apply to your specific account, book a call and we'll walk through it together.
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