In this guide
Wondering how much you can spend on ads before this SKU loses money? Our Amazon Profit Margin Calculator shows your break-even ACoS and max ad spend per unit at your target margin. Stop guessing your bid ceiling. Start protecting margin.
How it works
Three inputs. Profit and break-even ACoS in seconds.
- Enter sale price. Input your Amazon listing price per unit.
- Enter all-in cost. Add COGS, shipping, and Amazon fees per unit.
- Set target margin. Pick the net margin % you want to keep. Default 25%.
Pro tip: Use the break-even ACoS output as your max bid ceiling on every campaign.
Why break-even ACoS matters
Most Amazon sellers set ad bids without knowing margin headroom. They overbid and lose money on otherwise profitable SKUs.
By knowing break-even ACoS, you can:
- Set max bid ceilings per SKU before you launch.
- Spot loss-leader products that need a price fix.
- Compare actual ACoS against your break-even line.
- Verify margin reads against Brand Analytics.
With your break-even line clear, every bid decision protects profit.
What makes this tool different
- Break-even ACoS output: Surfaces your max ACoS ceiling. Most profit calcs skip this.
- Three easy inputs: Sale price, all-in cost, target margin. No FBA fee lookup required.
- Pairs with sibling calcs: Use our ACoS calc to compare actual vs break-even.
- Built for Amazon sellers: Tuned for Sponsored Products, Sponsored Brands, and Sponsored Display.
Frequently asked questions
What is profit margin, and why does it matter?
Profit margin is net profit divided by revenue, shown as a percentage. It shows how much you keep per dollar sold on Amazon.
How do you calculate break-even ACoS?
Sale price minus all-in cost, divided by sale price, times 100. Equals your pre-ad profit margin %.
What's a good profit margin on Amazon?
Healthy private-label brands target 15-25% net margin after ads. Category, sourcing model, and ad spend affect the right band for you.
How does break-even ACoS help me lower ad costs?
Bidding above your break-even ACoS loses money per unit sold. Pair with our ACoS calc to check actual vs break-even weekly.
Is this calculator free?
Yes. The Profit Margin Calculator is free. No signup, no catch.
Last updated Oct 4, 2026 by the Amplivus strategy team.
