Amazon ACoS Estimator
Estimate your Amazon PPC ACoS based on selling price, average CPC, conversion rate, and profit margin.
Example Calculation
Let’s say your product selling price is $25, your average CPC is $1, and your conversion rate is 10%.
With a 10% conversion rate, you need about 10 clicks to generate one order.
Your estimated advertising cost per order is:
$1 / 10% = $10
Your estimated ACoS is:
$10 / $25 = 40%
Amazon ACoS Estimator Formula
This calculator uses the following formula to estimate your Amazon PPC ACoS before launching or scaling your ads:
Estimated ACoS = CPC / （Conversion Rate × Selling Price） × 100%
CPC means the average cost you pay for each ad click. Conversion rate means the percentage of clicks that turn into orders. Selling price is the product price used to calculate advertising cost as a percentage of sales.
What Is a Good ACoS on Amazon?
A good ACoS depends on your profit margin, product lifecycle, advertising goal, and competition level.
If your product profit margin is 30%, your break-even ACoS is around 30%. In this case, an ACoS below 30% may be profitable, while an ACoS above 30% may mean you are losing money on ads.
However, a higher ACoS may be acceptable during a new product launch, keyword ranking campaign, or aggressive market expansion. For mature products, sellers usually need to keep ACoS below the break-even point to maintain profitability.
How to Lower Your Amazon ACoS
To lower your ACoS, you can either reduce your CPC, improve your conversion rate, or increase your selling price.
- Improve listing conversion rate: Optimize your main image, title, bullet points, A+ content, reviews, and pricing.
- Reduce wasted clicks: Add negative keywords and remove irrelevant search terms.
- Optimize keyword bids: Lower bids for high-spend, low-conversion keywords.
- Separate campaigns by keyword intent: Brand terms, exact keywords, broad keywords, and product targeting should be managed differently.
- Monitor profit margin: ACoS alone is not enough. Sellers should also consider product cost, FBA fees, referral fees, and promotion costs.
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Amazon ACoS Estimator FAQ
What is ACoS on Amazon?
ACoS stands for Advertising Cost of Sales. It measures how much you spend on Amazon ads to generate sales. The basic formula is Ad Spend ÷ Ad Sales × 100%.
How do you estimate ACoS before running ads?
You can estimate ACoS by using your expected CPC, conversion rate, and selling price. The formula is Estimated ACoS = CPC /（Conversion Rate × Selling Price） × 100%.
What is break-even ACoS?
Break-even ACoS is the ACoS level where your advertising cost equals your profit margin. If your profit margin is 30%, your break-even ACoS is around 30%.
Is a lower ACoS always better?
Not always. A lower ACoS may mean higher profitability, but it can also limit sales growth. During product launches, sellers may accept a higher ACoS to gain ranking and visibility.
How can I improve my estimated ACoS?
You can improve your estimated ACoS by lowering CPC, increasing conversion rate, improving listing quality, optimizing keywords, and increasing product price or average order value.