01
Enter ad spend and ad revenue
Pull these from your Amazon Ads console for the period you want to analyse. Ad spend is your total cost; ad revenue is the sales attributed to those ads.
Amazon ACOS Calculator
Calculate Amazon ACOS, break-even ACOS, and net profit from your ad campaigns.
Updated Reviewed by Sajid Hussain· Editor
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Last updated
June 7, 2026
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Amazon advertising profitability
ACOS tells you where you spent — break-even ACOS tells you if it paid off
ACOS (Advertising Cost of Sales) is your ad spend divided by ad-attributed revenue, expressed as a percentage — the number Amazon uses to measure how efficiently your campaigns convert spend into sales. A 25% ACOS means 25 cents of every ad-sales dollar paid for the ad itself. Without your gross margin alongside it, ACOS alone cannot tell you whether a campaign is profitable.
ACOS (Advertising Cost of Sales) is the percentage of ad revenue consumed by ad spend. A 25% ACOS means 0.25 of every ad dollar earned went to pay for the ad. Amazon shows this in your Ads console — but without your gross margin in the picture, ACOS alone tells you nothing about profit.
Break-even ACOS is where the real clarity begins. It equals your gross margin percentage. A product with 35% gross margin has a 35% break-even ACOS. Run above this and your advertising is actively losing money on every sale. Run below it and you are profitable — the gap between your actual ACOS and your break-even is your safety margin.
Target ACOS goes one step further: it is the ACOS that leaves a specific profit percentage after ads. If you want to keep half your gross margin as profit and spend the other half on ads, your target ACOS is half your gross margin. This gives you a concrete bid target rather than just a ceiling.
This calculator computes all three in real time. Enter your ad spend, ad revenue, and gross margin — you get your ACOS, break-even, and target instantly, along with net profit from ads and profit per dollar spent.
Quick facts
- Metrics computed
- ACOS · break-even · target · ROAS · net profit
- Inputs required
- 3 core numbers from your Ads console
- Break-even logic
- Tied to your actual gross margin
- Profit visibility
- Net profit and profit per ad dollar
- Works globally
- 9 regions · auto currency
- Time to first result
- < 5 seconds
How it works
From ad spend to a clear profitability verdict in 4 steps
Three numbers from your Amazon Ads console plus your gross margin are enough to know whether your advertising is making or losing money — and exactly how much.
02
Enter your gross margin
Your gross margin before ad spend — covering product cost, Amazon fees (referral + FBA), and fulfillment. This single number sets your break-even ACOS ceiling.
03
Set your target profit allocation
Decide what share of your margin you are willing to spend on ads. 50% means half goes to ads, half stays as profit. This computes your target ACOS.
04
Read the verdict
See your ACOS vs break-even and target, net profit from ads, and profit per dollar spent — then act on the gap.
Steps to use the Amazon ACOS Calculator: Enter ad spend and ad revenue, Enter your gross margin, Set your target profit allocation, Read the verdict.
Formulas
The exact math behind every ACOS output
No black boxes. Every formula is shown below so you can verify the results yourself or replicate them in a spreadsheet.
01
ACOS
ACOS = (Ad Spend ÷ Ad Revenue) × 100
Your advertising cost as a percentage of the revenue those ads generated.
Example: 500 spend ÷ 2,000 revenue × 100 = 25% ACOS
02
ROAS
ROAS = Ad Revenue ÷ Ad Spend
The revenue multiple returned for every unit of ad spend. ROAS = 100 ÷ ACOS.
Example: 2,000 ÷ 500 = 4.0× ROAS
03
Break-even ACOS
Break-even ACOS = Gross Margin %
At this ACOS, every dollar of profit from the ad sale is consumed by the ad cost. Spend more than this and you are losing money on ads.
Example: 35% gross margin → 35% break-even ACOS
04
Target ACOS
Target ACOS = Gross Margin % × (1 − Target Profit Allocation / 100)
The ACOS that preserves your desired profit margin after allocating a portion to ads.
Example: 35% margin × (1 − 0.50) = 17.5% target ACOS
05
Net Profit from Ads
Net Profit = Ad Revenue × (Gross Margin % / 100) − Ad Spend
The actual profit from ad-driven sales after paying for the ads. Positive means ads are contributing to profit.
Example: 2,000 × 0.35 − 500 = 700 − 500 = 200
06
Profit per Dollar of Ad Spend
Profit per Dollar = (Break-even ACOS − Actual ACOS) / 100
Positive means every dollar in ad spend generates profit; negative means every dollar is a loss.
Example: (35 − 25) / 100 = 0.10 → 0.10 profit per ad dollar
Worked example
500 ad spend, 2,000 ad revenue, 35% margin: the full ACOS picture
A realistic scenario walked step by step — all numbers hand-verified so you can replicate the logic yourself.
Scenario
You spent $500.00 on Amazon ads and generated $2,000.00 in ad-attributed sales. Your gross margin is 35% and you want to allocate 50% of that margin to advertising.
1
Step 1 · Calculate your ACOS
$500.00 ÷ $2,000.00 × 100 = 25% ACOS. In ROAS terms: $2,000.00 ÷ $500.00 = 4.0×.
ACOS 25% · ROAS 4.0×
2
Step 2 · Find your break-even ACOS
Break-even ACOS = gross margin = 35%. Any ACOS below 35% means ads are profitable. Your 25% ACOS sits 10 percentage points below break-even — you have headroom.
Break-even ACOS 35%
3
Step 3 · Set your target ACOS
35% margin × (1 − 50%) = 17.5% target ACOS. At this ACOS, half your margin pays for ads and the other half stays as profit.
Target ACOS 17.5%
4
Step 4 · Check net profit from ads
$2,000.00 × 35% = 700 gross margin from ad sales. Subtract $500.00 ad spend: 700 − $500.00 = $200.00 net profit from ads.
$200.00 net profit from ads
The takeaway
With a 25% ACOS well below your 35% break-even, your ads are profitable and have room to scale. Your 25% ACOS is also above your 17.5% target, meaning you could tighten bids slightly to improve profit margin.
Industry benchmarks
What ACOS looks like across Amazon categories
Compare your ACOS to real-world benchmarks by product category. These ranges reflect competitive, established listings — new product launches typically run higher ACOS intentionally.
| Metric | Poor | Average | Good | Excellent |
|---|---|---|---|---|
ACOS — Fashion & Apparel Jungle Scout State of the Amazon Seller 2024 | > 30% | 20–30% | 12–20% | < 12% |
ACOS — Consumer Electronics Helium 10 Benchmark Data 2024 | > 20% | 12–20% | 7–12% | < 7% |
ACOS — Home & Kitchen Jungle Scout State of the Amazon Seller 2024 | > 35% | 22–35% | 15–22% | < 15% |
ACOS — Beauty & Personal Care Helium 10 Benchmark Data 2024 | > 28% | 18–28% | 10–18% | < 10% |
ACOS — Toys & Games Jungle Scout State of the Amazon Seller 2024 | > 30% | 20–30% | 12–20% | < 12% |
Tool comparison
Calcrux vs. other ACOS tools
| Feature | Feature | Calcrux (free) | SellerApp ACOS Tool | Manual spreadsheet |
|---|---|---|---|---|
| Break-even ACOS tied to your margin | ||||
| Target ACOS with profit allocation | ||||
| Net profit from ads | ||||
| Profit per dollar of ad spend | ||||
| ROAS alongside ACOS | ||||
| No signup required | ||||
| Works in any currency | ||||
| Instant results, no download |
Common mistakes
ACOS mistakes that make profitable campaigns look unprofitable — and vice versa
Judging ACOS without knowing break-even
Why it matters
A 25% ACOS is great on a 40% margin product and a loss on a 20% margin product. Without break-even ACOS, the number is meaningless.
Fix
Always calculate break-even ACOS (= your gross margin %) before evaluating any campaign.
Using selling price as gross margin
Why it matters
Gross margin must subtract COGS, Amazon referral fees, FBA fees, and fulfillment costs — not just leave the selling price untouched. Overstating margin makes campaigns look more profitable than they are.
Fix
Calculate gross margin as: (Selling Price − COGS − Amazon Fees − Fulfillment) ÷ Selling Price × 100.
Mixing date ranges between spend and sales
Why it matters
Amazon ads have a 14-day attribution window. Ad spend this week may generate sales reported next week. Comparing spend from one period to sales from another distorts ACOS.
Fix
Use matching date ranges for both spend and attributed sales when pulling from your Ads console.
Running high ACOS indefinitely on mature listings
Why it matters
High ACOS may be acceptable during a product launch when you are buying rank and reviews. On a mature listing with established organic rank, high ACOS means wasted budget.
Fix
Review ACOS quarterly. Once a listing has strong organic rank, tighten bids to bring ACOS toward your target.
Treating ACOS as the only success metric
Why it matters
ACOS ignores organic revenue. A campaign with a 35% ACOS that is driving significant organic rank uplift (visible as falling TACoS) may be creating much more value than its ACOS suggests.
Fix
Track TACoS (Total ACOS) alongside ACOS to capture the full impact of advertising on your business.
Pro tips
How to use ACOS to run tighter, more profitable campaigns
Bid to your target ACOS
Max bid = Target ACOS × Conversion Rate × Selling Price. If your target ACOS is 17.5% and your conversion rate is 10%, bid no more than 1.75 per click on a 10 selling-price keyword to stay on target.
Segment campaigns by margin
High-margin products can sustain a higher break-even ACOS. Give them bigger budgets and broader match types. Low-margin products need tighter exact-match campaigns to stay profitable.
Track ACOS by keyword
Campaign-level ACOS hides the keywords that are dragging performance. Pull search term reports weekly and pause any keyword where ACOS exceeds your break-even for three consecutive weeks.
Set a launch ceiling
During launch, set an ACOS ceiling equal to your gross margin (break-even). Once the listing has 30+ reviews and organic rank, begin tightening toward your target ACOS.
Track TACoS alongside ACOS
If your ACOS is flat but TACoS is falling, your ads are building organic rank — a strong sign. Rising TACoS with flat ACOS means you are becoming more reliant on paid traffic. Use the Amazon TACoS Calculator to track both.
Who uses this
When sellers reach for the ACOS Calculator
The Amazon ACOS Calculator works across every stage of the workflow.
Private label seller reviewing monthly ad performance
Pulls spend and sales from the Ads console, enters gross margin, and immediately sees whether the month was profitable — or which campaigns crossed the break-even line.
New seller setting bids for a product launch
Calculates break-even ACOS from margin before spending anything, uses it as a ceiling to prevent ads from losing money before reviews accumulate.
Amazon PPC agency reporting to clients
Runs client spend and revenue through the calculator during monthly reviews to give a profit-based verdict — not just an ACOS percentage — that clients actually understand.
Seller scaling an ad budget
Checks current ACOS vs target ACOS before increasing spend. If there is headroom below target, scaling is safe. If ACOS is already above target, the listing needs optimisation first.
Seller comparing campaigns across multiple products
Runs each product through the calculator with its own gross margin to get a product-specific break-even ACOS — because the same ACOS means different things for a 50%-margin product vs. a 15%-margin product.
Glossary
Amazon advertising terms explained simply
Every important term you'll encounter in this calculator and the broader topic.
- ACOS (Advertising Cost of Sales)
- Ad spend divided by ad revenue, expressed as a percentage. A 25% ACOS means 0.25 of every ad dollar earned went to pay for the ad. Lower is generally better, but the threshold for "good" depends on your gross margin.
- ROAS (Return on Ad Spend)
- Ad revenue divided by ad spend — the revenue multiple returned per unit of spend. A 4× ROAS means every 1 in ad spend returned 4 in sales. ROAS = 100 ÷ ACOS.
- Break-even ACOS
- The ACOS at which ad profit is exactly zero — equal to your gross margin percentage. Spend above this and every ad sale loses money. The single most important number for evaluating campaign profitability.
- Target ACOS
- The ACOS that preserves a desired profit margin after ad spend. Calculated as Gross Margin × (1 − Target Allocation %). Used to set bid ceilings that keep campaigns profitable.
- TACoS (Total Advertising Cost of Sales)
- Ad spend divided by total revenue (ad-attributed + organic), expressed as a percentage. Unlike ACOS, TACoS captures the halo effect — when ads lift organic rank, total revenue grows and TACoS falls even if ACOS stays flat.
Help & answers
Frequently asked questions
Everything you need to know about how the Amazon ACOS Calculator works.
01What is Amazon ACOS?
ACOS stands for Advertising Cost of Sales. It is your ad spend divided by ad revenue, expressed as a percentage. An ACOS of 25% means you spent 25 in ads to generate 100 in sales. Amazon shows ACOS in your Ads console — lower is generally better, but what counts as "good" depends on your gross margin.
02What is the ACOS formula?
ACOS = (Ad Spend ÷ Ad Revenue) × 100. For example: 500 spend ÷ 2,000 revenue × 100 = 25% ACOS.
03What is a good ACOS on Amazon?
A "good" ACOS is any number below your gross margin percentage. If your gross margin is 35%, then any ACOS below 35% means ads are profitable. Most experienced sellers target an ACOS of 15–25% in well-established categories. Brand-new products may intentionally run higher ACOS to build rank and reviews.
04What is break-even ACOS?
Break-even ACOS equals your gross margin percentage. At this ACOS, ad revenue exactly covers all costs including the ad spend itself — you make zero profit on ad sales. Any ACOS below this number is profitable; above it you are losing money on advertising.
05What is target ACOS?
Target ACOS is the ACOS that leaves your desired profit margin after advertising. If your gross margin is 35% and you want to spend no more than half your margin on ads, your target ACOS is 35% × (1 − 0.5) = 17.5%. Setting bids to hit this target preserves the other half as profit.
06What is the difference between ACOS and ROAS?
ACOS and ROAS express the same relationship differently. ACOS = Ad Spend ÷ Ad Revenue × 100 (a percentage). ROAS = Ad Revenue ÷ Ad Spend (a multiple). A 25% ACOS is the same as a 4× ROAS. ACOS = 100 ÷ ROAS, and ROAS = 100 ÷ ACOS.
07How do I lower my Amazon ACOS?
Lower ACOS by improving conversion rate (better images, title, bullet points, reviews), adding negative keywords to cut wasted spend, pausing low-performing keywords, shifting budget to high-converting ASINs, and using exact/phrase match instead of broad match on proven terms.
08What is the difference between ACOS and TACoS?
ACOS measures ad spend against ad-attributed revenue only. TACoS (Total Advertising Cost of Sales) measures ad spend against total revenue — both ad-driven and organic. TACoS is the truer measure of advertising efficiency because it captures the halo effect: ads that lift your organic ranking reduce TACoS even when ACOS stays flat.
09Is a high ACOS always bad?
Not always. A high ACOS during a product launch is often intentional — you are paying for visibility, rank, and reviews rather than immediate profit. Once a product establishes organic rank, reducing ACOS by tightening bids typically improves overall profitability.
10How does gross margin affect break-even ACOS?
Break-even ACOS equals gross margin percentage. A product with 40% gross margin can sustain a 40% ACOS before ads become unprofitable. A low-margin product with 15% gross margin can only sustain 15% ACOS. Higher-margin products have more headroom for advertising.
11Can ACOS be above 100%?
Yes — an ACOS above 100% means you spent more on ads than the ads generated in revenue. This happens with very broad match keywords, irrelevant placements, or campaigns left running with no optimisation. It is always a loss, regardless of your margin.
12Does this ACOS calculator work for Sponsored Brands and Sponsored Display?
Yes. ACOS is calculated the same way regardless of Amazon ad type: Ad Spend ÷ Ad Revenue × 100. Enter the spend and revenue from any Amazon Ads campaign type — Sponsored Products, Sponsored Brands, or Sponsored Display — and the break-even and target ACOS logic applies identically.
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Category
Ecommerce Seller Operations
Subcategory
ads marketing
Availability
Global · 9 markets
Price
Free forever
Topics
amazon acos calculatoracos formulaamazon advertising acoswhat is acos amazonbreak even acosacos vs roasamazon ppc acosgood acos amazonacos calculator freeadvertising cost of salesamazon ads profitabilitytarget acos calculator
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