Cross-Border Seller Calculators
Break-Even ACOS Calculator
Find the highest advertising cost of sales your margin can support before profit reaches zero.
Calculator inputs
Calculation results
Enter your inputs, then select Calculate to view the results.
Formula
Break-even ACOS formula
Break-even ACOS equals pre-advertising profit divided by selling price.
How to use this calculator
- Enter commercial inputs
Enter the selling price and all non-advertising costs so the calculator can determine pre-ad profit.
- Compare ACOS thresholds
Review break-even ACOS against your current and target advertising cost of sales.
- Set a safer target
Use the threshold for planning and leave a margin for returns, taxes, and other unmodeled costs.
Worked example
Example inputs
- Selling price
- $40
- Pre-ad profit
- $10
Calculation
$10 ÷ $40 × 100% = 25%.
What the result means
25% break-even ACOS.
How to use the result
ACOS below 25% leaves profit before unmodeled costs; 25% produces zero profit; above 25% loses money.
Common mistakes
- Using profit after advertising instead of pre-ad profit.
- Setting target ACOS exactly at break-even with no safety margin.
FAQ
Frequently asked questions
Should my target ACOS equal break-even ACOS?
Usually no. A lower target leaves room for profit and normal cost variation.