Finding Your
Break-even ACoS —
The Number That Changes Everything
Two sellers. Same 25% ACoS. One is scaling profitably. The other is losing money on every single sale. The difference? One knows their Break-even ACoS. The other does not.
A 25% ACoS means nothing on its own. Without knowing your Break-even ACoS, you are flying blind — spending ad budget with no idea whether each sale is adding to your profit or silently draining it. This guide gives you the one number that makes your entire PPC strategy make sense.
Headroom remaining: 38.6%
Status: Can scale aggressively
Over break-even by: 7.2%
Status: Losing ₹7+ on every ad sale
3 Numbers Every Amazon PPC Seller Must Know
Break-even ACoS does not exist in isolation. It works alongside two other numbers — Gross Margin and Target ACoS. Here is how all three connect.
| Metric | Seller A — High Margin | Seller B — Thin Margin | What It Means |
|---|---|---|---|
| MRP | ₹2,000 | ₹599 | Selling price on Amazon |
| Revenue in Hand | ₹1,786 (at 12% GST) | ₹535 (at 12% GST) | MRP ÷ 1.12 |
| COGS + Fees | ₹400 + ₹250 = ₹650 | ₹280 + ₹160 = ₹440 | Total product cost |
| Gross Profit | ₹1,136 | ₹95 | Revenue minus all costs |
| Gross Margin % | 63.6% | 17.8% | Gross profit ÷ revenue |
| Break-even ACoS | 63.6% Lots of room | 17.8% Very tight | = Gross Margin % |
| Actual ACoS | 25% | 25% | From Seller Central |
| Verdict | +38.6% headroom | −7.2% loss per sale | Same ACoS, opposite results |
Formulas + Worked Examples — Click to Expand
Four cards — the core formula, two real product examples, and a practical 5-step system for using Break-even ACoS in live campaigns.
Break-even ACoS = Gross Margin %
Target ACoS = Break-even ACoS × 70–80%
− COGS = ₹400
− Amazon Fees = ₹250
Gross Profit = ₹1,135.71
− COGS = ₹280
− Amazon Fees = ₹160
Gross Profit = ₹94.82
Fix pricing first, then run ads
Formulas + Worked Examples — Click to Expand
Each card contains the formula, a step-by-step worked example, and a key takeaway. Here is a free preview of the core formula:
Target ACoS = Break-even ACoS × 70–80%
If your Gross Margin is 35%, your Break-even ACoS is 35%. Any ACoS below this = profitable. Any ACoS above = losing money on every ad-driven sale.
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What You Learned in Module 2
A 25% ACoS can mean highly profitable or deeply unprofitable — depending entirely on your product margin. ACoS only makes sense compared to your Break-even ACoS.
Calculate it as (Revenue − COGS − Fees) ÷ Revenue × 100. This single number is the foundation of every campaign decision you make.
Break-even gives you the ceiling. Target ACoS gives you the operational goal — with enough buffer to stay profitable even when CPC fluctuates.
Running ads on a sub-15% break-even ACoS product is structurally unviable. No campaign optimisation can fix a margin problem.
Calculate Your Break-even ACoS Right Now
Use the free SelluxPro ACoS Calculator. Enter your selling price, COGS and Amazon fees — your Break-even ACoS, Target ACoS and campaign verdict are calculated instantly.
Free to use · No account needed · Works instantly