How to Reduce ACOS on Amazon
A practical guide to improving Amazon advertising efficiency and increasing profitability.
If your Amazon ads generate sales but your ACOS is too high, your profits get reduced. This guide explains simple and practical ways to lower ACOS while increasing sales.
ROI HUNT Editorial Team · March 2026 · 12 min read
What is ACOS on Amazon?
ACOS stands for Advertising Cost of Sales. It measures how much advertising spend is required to generate revenue from ads.
ACOS Formula
ACOS = (Ad Spend ÷ Ad Revenue) × 100
Example
Lower ACOS generally means higher profitability from advertising.
Quick Summary
- ACOS = Ad Spend ÷ Ad Revenue × 100. Lower is better.
- Your break-even ACOS equals your product profit margin percentage.
- Listing quality directly affects ACOS — better listings convert more clicks into sales.
- Weekly campaign optimization is the most reliable way to reduce ACOS.
ACOS vs ROAS
Both metrics measure advertising efficiency but from different angles.
| Metric | Formula | What It Shows |
|---|---|---|
| ACOS | Ad Spend ÷ Ad Revenue × 100 | Ad cost as % of revenue — lower is better |
| ROAS | Ad Revenue ÷ Ad Spend | Revenue earned per ₹1 of spend — higher is better |
Example
Ad Spend
₹1,000
Revenue
₹5,000
ACOS
20%
ROAS
5x
What is Break-Even ACOS?
Break-even ACOS is the maximum advertising cost your product can sustain before ads start losing money.
Formula & Example
Break-Even ACOS = Profit Margin %
If ACOS stays below 40%, advertising remains profitable on this product.
What is a Good ACOS on Amazon?
A good ACOS depends entirely on your product margin. There is no universal target.
| Product Type | Typical Margin | Target ACOS |
|---|---|---|
| Low margin product | 15–25% | 10–20% |
| Medium margin product | 30–40% | 20–30% |
| High margin product | 50%+ | 30–40% |
Always calculate your break-even ACOS first. A 25% ACOS might be excellent for one product and catastrophic for another depending on margin.
Why ACOS Gets High
High ACOS usually comes from one or more of these root causes:
- Poor keyword targeting — ads showing for irrelevant searches
- Weak product listing — low conversion rate wastes every click
- Incorrect bidding strategy — overbidding on low-converting keywords
- Broad keywords consuming budget without targeted results
- Low product ratings reducing conversion rate
- Poor product images that fail to convert browsers into buyers
10 Proven Ways to Reduce ACOS on Amazon
Implement these in order for the fastest results.
Optimize Product Listings
Better images and descriptions increase conversion rates. A higher conversion rate means more sales from the same ad spend — which directly lowers ACOS.
Amazon Listing Optimization GuideUse Long-Tail Keywords
Long-tail keywords have lower competition, lower CPCs, and higher purchase intent.
Pause Poor-Performing Keywords
Identify keywords with high spend but low or zero sales. Pause them or reduce bids to stop wasting budget.
Separate Campaign Types
Running broad, phrase, and exact match keywords in the same campaign limits control. Create separate campaigns for each match type to manage bids and budgets independently.
Use Negative Keywords
Negative keywords prevent your ads from showing for irrelevant searches. Review the search term report weekly and block terms like "cheap", "free", or unrelated category terms.
Improve Product Conversion Rate
Every unsold click costs money. Better images, more reviews, and clearer descriptions turn more clicks into purchases — reducing what you spend per sale.
Adjust Bidding Strategy
Reduce bids on keywords where CPC is high but conversion is low. Increase bids on keywords that already convert well to scale what is working.
Focus on Best-Selling Products
Advertise products that already have good reviews and conversion rates. Sending traffic to weak listings wastes budget.
Use Exact Match Campaigns
Exact match campaigns target highly specific searches. They typically deliver lower ACOS because every click is from a buyer using your exact keyword.
Optimize Campaigns Weekly
Track ACOS, CPC, CTR, and conversion rate every week. Small, consistent improvements compound into major ACOS reductions over time.
Is your ACOS too high?
Our team reviews your Amazon ad account and identifies exactly where budget is being wasted.
ACOS Optimization Checklist
Listing Images
Main image on white, 6+ total, includes lifestyle and infographic
Product Title
Primary keyword in first 80 characters, benefit-focused
Pause Bad Keywords
High spend + low sales keywords paused or bid-reduced
Add Negative Keywords
Reviewed search term report and blocked irrelevant terms
Improve Reviews
Request a Review enabled for every order
Optimize Bids
Increased bids on converting keywords, reduced on non-converting
Monitor Weekly
ACOS, CPC, CTR, conversion rate reviewed every 7 days
Real Example: Before and After Optimization
This is what structured ACOS optimization can achieve over 8 weeks:
Before Optimization
After Optimization
Ad spend dropped by ₹5,000 while revenue nearly doubled. This was achieved through negative keyword cleanup, long-tail keyword targeting, listing image improvements, and weekly bid optimization.
Common Amazon ACOS Mistakes
Running only broad keywords
Broad keywords often match irrelevant searches, wasting spend on clicks that never convert.
Ignoring negative keywords
Without negatives, your budget leaks into searches that will never buy your product.
Not optimizing listings
Sending paid traffic to a weak listing is like filling a leaking bucket — fix the listing first.
Advertising low-review products
Products with fewer than 10 reviews convert poorly. Ads amplify the problem.
Not analyzing data weekly
Monthly reviews miss the window to stop wasted spend before it compounds.
Why ROI HUNT Understands Amazon ACOS Optimization
- Our team has worked with more than 200 ecommerce brands.
- We manage large-scale Amazon advertising campaigns across categories.
- We focus on profit-focused growth — not just increasing sales volume.
- We analyze campaign structure, keyword targeting, listing quality, and advertising efficiency together.
Key Takeaways
- ACOS = Ad Spend ÷ Ad Revenue × 100. Your break-even ACOS equals your profit margin %.
- Listing quality is the single biggest lever for reducing ACOS — better conversion = lower ACOS.
- Negative keywords stop budget leaking into irrelevant searches. Add them every week.
- Separate broad, phrase, and exact campaigns for better bid control.
- Optimize weekly. Small consistent improvements compound into major ACOS reductions.
Frequently Asked Questions
What is a good ACOS on Amazon?
It depends on your product margin. Many sellers target an ACOS between 15% and 30%. The most accurate benchmark is your own break-even ACOS — if your profit margin is 35%, any ACOS below 35% means your ads are profitable.
Can ACOS be reduced quickly?
Yes. Pausing poor keywords and adding negative keywords can reduce ACOS within a few weeks. Listing improvements and bid optimization have a compounding effect over time.
Does listing quality affect ACOS?
Yes. A higher conversion rate means more sales from the same number of clicks — which directly lowers ACOS. Better product images, clear titles, strong bullet points, and positive reviews all improve conversion and reduce ACOS.
How often should campaigns be optimized?
Ideally every week. Weekly optimization allows you to catch wasted spend early, add negative keywords from fresh search term data, and adjust bids before poor performance compounds.
Related Guides
Amazon PPC Strategy Guide
Build a complete Amazon advertising strategy from the ground up.
Amazon Listing Optimization Guide
Improve conversion rates to reduce ACOS without cutting ad spend.
Amazon FBA Fees and Profit Guide
Understand all cost layers before setting your advertising budget.
Amazon TACOS Explained
Learn how TACOS and ACOS work together to measure advertising health.