🔥 Tier 1 - Must KnowID: acosMetric
ACoS - Advertising Cost of Sales
Amazon's primary ad efficiency metric: Ad Spend ÷ Ad Revenue (Inverse ROAS)
In Simple Words (Zero Jargon):
What percentage of your ad sales was spent on advertising (e.g. if you spent ₹25 to make ₹100 in sales, your ACoS is 25%). Lower is better.
Official Mathematical Equation
ACoS% = (Ad Spend ÷ Ad-Attributed Revenue) × 100 | ROAS = 100 ÷ ACoS
Why It Is Critical
ACoS is the heartbeat of Amazon advertising. Your Break-Even ACoS equals your product profit margin before ads. If your product margin is 45%, any ACoS below 45% is profitable.
Calculation Example & Benchmark Matrix
| Cost Component | Example Calculation (₹1,000 Product) |
|---|---|
| Product Selling Price | ₹1,000 |
| Amazon Referral Fee (12%) | ₹120 |
| FBA Fulfilment Fee | ₹80 |
| Cost of Goods Sold (COGS) | ₹350 |
| Total Variable Costs | ₹550 |
| Profit Margin Before Ads | ₹450 = 45% |
| Break-Even ACoS | 45% - any ACoS below 45% generates positive net profit |
| Target ACoS | 20-25% - leaving 20-25% pure net profit margin after ad spend |
'ACoS without knowing your product profit margin is a number with no meaning. A 30% ACoS is fantastic for a 60% margin product and bankrupting for a 20% margin product. Always calculate break-even ACoS first.'
What You Get: A margin-grounded efficiency target that tells you exactly when your Amazon advertising is making money versus losing cash.