12 Amazon Advertising KPIs Every Seller Should Track

Most Amazon sellers track ACoS. That is the beginning and end of their analytics practice. They watch that single number go up or down and make decisions accordingly — pausing campaigns when it rises, increasing bids when it falls.

This is like trying to drive cross-country using only the speedometer. You have one piece of information, and you are making a thousand decisions based on it while ignoring everything else the dashboard is trying to tell you.

Here are the 12 metrics that actually paint a complete picture of Amazon advertising performance — what each one means, why it matters, and what to do when it moves in the wrong direction.

Cost Metrics

1. ACoS (Advertising Cost of Sale)

ACoS is ad spend divided by ad-attributed revenue, expressed as a percentage. If you spend $100 on ads and those ads generate $500 in sales, your ACoS is 20%.

Your target ACoS is not 20%. Your target ACoS depends entirely on your margins. The critical number is your break-even ACoS — the maximum ACoS at which you make zero profit. Calculate it like this:

Break-Even ACoS = (Revenue − COGS − Amazon Fees − Fulfillment) / Revenue

If your break-even ACoS is 35%, an ACoS of 30% is profitable. An ACoS of 40% is bleeding money. Context is everything.

2. TACoS (Total Advertising Cost of Sale)

TACoS divides your total ad spend by your total revenue — not just ad-attributed revenue. This captures your advertising cost relative to your entire business, including organic sales.

TACoS is the better long-term health metric because it shows whether advertising is building your organic position or just subsidizing it. A business with improving TACoS over time is gaining organic momentum. A business with flat or rising TACoS is becoming more dependent on paid traffic.

If your ACoS looks fine but your TACoS is high, you probably have weak organic ranking and are paying for visibility that should come for free.

3. ROAS (Return on Ad Spend)

ROAS is the inverse of ACoS, expressed as a multiplier: revenue divided by spend. A 5:1 ROAS means $5 of revenue for every $1 spent. Many sellers prefer this framing because it feels more intuitive.

Target ROAS varies by category and margin. A high-margin consumable might run profitably at 4:1 ROAS. A low-margin commodity needs 8:1 or higher. Know your number.

Traffic Metrics

4. Impressions

Impressions measure how many times your ad was shown. Impressions alone mean nothing — a million impressions that never convert just means you are visible to the wrong people.

Where impressions become useful: when they drop unexpectedly. A sudden fall in impressions usually means your bid dropped below the competitive threshold, your budget is being exhausted too early in the day, or your listing was suppressed by Amazon. Any of these is worth investigating immediately.

5. Click-Through Rate (CTR)

CTR is clicks divided by impressions. The Amazon benchmark varies by category and placement, but a good Sponsored Products CTR in competitive categories is typically 0.35% to 0.5%. Sponsored Brands top-of-search often runs higher.

Low CTR usually points to one of three problems:

• Your main image is not compelling enough to earn a click in search results
• Your title does not match what the shopper is looking for
• Your price is visibly higher than the competition

High CTR with poor conversion rate means you are attracting the wrong clicks — either the title over-promises or the listing underdelivers.

6. Cost Per Click (CPC)

CPC is what you pay for each click. Rising CPC in a campaign means competition is intensifying. If your CPC rises but your conversion rate stays flat, your ACoS will deteriorate. The solution is either to improve your conversion rate to justify the higher CPC, or to find lower-competition keywords with comparable intent.

Conversion Metrics

7. Conversion Rate (CVR)

Conversion rate is orders divided by clicks. Amazon’s category average is typically 8% to 12% for Sponsored Products, significantly higher than most e-commerce channels because shoppers on Amazon have high purchase intent.

A conversion rate below category average usually means a listing problem, not an advertising problem. Poor images, thin bullets, low review count, or off-market pricing all depress CVR. No amount of bid optimization fixes a listing that does not convert.

8. Cost Per Acquisition (CPA)

CPA is total ad spend divided by number of orders. This is your cost to acquire one customer through advertising.

CPA is the metric that ties directly to your unit economics. If your product grosses $15 in margin and your CPA is $12, you are barely surviving. If your CPA is $4, you are scaling profitably. Calculate the CPA at which your advertising is still profitable, then optimize toward it.

Audience and Competitive Metrics

9. Impression Share

Impression share tells you what percentage of eligible impressions your ads captured. If there were 100,000 searches for your target keyword and you appeared in 40,000 of them, your impression share is 40%.

Low impression share means either your budget ran out before all those searches happened (budget-limited impression share) or your bid was too low to win the auction (rank-limited impression share). Amazon tells you which.

A product launch should target aggressive impression share on core keywords. An established product with strong organic ranking can afford lower impression share — you are supplementing organic, not substituting for it.

10. New-to-Brand Rate

New-to-brand metrics tell you what percentage of your attributed sales came from customers who had not purchased from you before in the past 12 months. This is available for Sponsored Brands and Sponsored Display campaigns.

High new-to-brand rate in prospecting campaigns is healthy — it means you are actually finding new customers. Low new-to-brand rate means you are mainly capturing sales from people who would have found you anyway. This is not always bad (brand defense is legitimate) but it is important to know.

Revenue and Efficiency Metrics

11. Total Sales vs. Ad-Attributed Sales

This gap is your organic revenue — sales that happened without advertising assistance. Track how this ratio changes over time.

A healthy advertising strategy should increase organic sales over time, not just subsidize ad-attributed sales. If your total sales are growing but the ratio of organic to paid is improving, your advertising is building equity. If total sales only grow when you increase ad spend, you have no organic flywheel.

12. Return Rate

Return rate is not an advertising metric per se, but it lives in the analytics that advertising sellers should monitor because it directly affects the value of every sale your advertising drives.

A high return rate means your advertising is acquiring sales that are likely to be reversed. Your ACoS looks fine, but a chunk of your “revenue” will disappear. If return rates spike after a specific campaign or keyword, that traffic may be creating false expectations your product cannot meet.

Building a Dashboard Around These 12 Metrics

The goal is not to watch all 12 metrics equally. Structure your review cadence like this:

Daily: ACoS, spend, impressions (flag anomalies only)

Weekly: CTR, CVR, CPC, CPA — the performance levers. Make bid and budget adjustments.

Monthly: TACoS, new-to-brand rate, organic vs. paid revenue split. Strategic health check.

Quarterly: Return rate, lifetime value by acquisition channel, impression share trends. Business-level review.

When a metric moves, look for correlated movements in the others before making changes. ACoS rising because CVR fell requires different action than ACoS rising because CPC climbed. The metrics tell a story — read the whole thing.

At AZvertising, our reporting framework covers all of these metrics for every client account, with clear benchmarks and action triggers built in. If your current reporting stops at ACoS and you want to see the full picture, let us show you what you are missing.