How the Advertising Break-even Calculator works
Before you commit a launch budget, know what it has to produce. This calculator turns a planned ad spend into the number of sponsored units and the sales value at which the ads exactly pay for themselves.
Add an expected conversion rate and CPC and it forecasts how many units the spend will actually buy, so you can see the gap before spending.
Formula
- Profit before ads = Price − Product cost − Shipping − Amazon fees − Returns − Misc
- Break-even ACoS = Profit before ads ÷ Price × 100
- Units to break even = Ad spend ÷ Profit before ads
- Sales to break even = Ad spend ÷ Break-even ACoS
- Expected units = (Ad spend ÷ CPC) × Conversion rate
Example
About $12 pre-ad profit means $1,000 of ads needs 84 sponsored units; at 10% conversion and $0.85 CPC the spend buys about 118 units, so it should pay off.
Selling price: 29.99Amazon category: home_kitchenProduct cost (per unit): 7Inbound shipping (per unit): 1FBA fulfillment fee: 4.75Planned ad spend: 1000Expected conversion rate % (optional): 10Expected CPC (optional): 0.85
Frequently asked questions
Does break-even include organic sales lift?
No. It is deliberately conservative: only sponsored units count. Any organic lift is upside.
Why is break-even ACoS the same as margin before ads?
Because ACoS is ad spend as a share of sales, and the most you can spend per sale without losing money is exactly the pre-ad profit share.