Wasted ad dollars can seriously reduce your profits. If you run Amazon PPC campaigns, you’ve likely wondered about the “right” ACOS. Many sellers struggle to understand if their ACOS is healthy. With experience guiding sellers to $10K+ months, we know mastering Advertising Cost of Sales (ACOS) can impact your profits.

This guide covers everything you need to know about ACOS in Amazon advertising. We’ll look at benchmarks, calculations, real examples, and practical tips. Whether you’re new to Sponsored Products or an experienced seller getting ready for peak season, you’ll find tools here to help you reach your PPC goals and improve your return on ad spend (ROAS). Here’s what you’ll learn next: First, understand the formula behind ACOS; then explore the nuances specific to FBA sellers, and finally, discover pro optimization hacks to refine your strategy. Let’s get started.

What Is a Good ACOS for Amazon PPC?

First, what is ACOS? Advertising Cost of Sales (ACOS) is a key Amazon PPC metric that shows what percentage of your sales from ads you spend on advertising. The formula is (Ad Spend / Ad Revenue) x 100. A lower ACOS means your ads are more efficient because you’re spending less to earn more.

So, what counts as a good ACOS? It depends on your profit margins, product category, and where your business is at. Experts say to stay within the 15% to 30% range for Amazon PPC. If you’re between 15% and 30%, you’re in a healthy zone. Above 35%, it’s time to diagnose and optimize quickly.

For example, if your product has a 40% profit margin before ads, you can handle a higher ACOS and still make money. If your margin is only 20%, you’ll need a lower ACOS to stay profitable. If you use voice search, try asking, ‘Hey Siri, what’s a good ACOS on Amazon?’ and aim for under 30%.

Practical example: Let’s say you’re selling a $20 gadget. You spend $5 on ads and generate $25 in sales. Your ACOS is ($5 / $25) x 100 = 20%. That’s solid! It means for every dollar in sales, you’re only shelling out 20 cents on ads. Now, if your ACOS creeps to 40%, you’re spending 40 cents per dollar—eating into profits fast.

To lower your ACOS, try these quick wins:

• Refine keywords: Bid on long-tail terms like “best wireless earbuds for running” instead of broad ones.
• Negative keywords: Block irrelevant searches to avoid wasting spend.
• Ad scheduling: Run campaigns during peak hours using dayparting tools.
• A/B test creatives: Swap images and copy to boost click-through rates (CTR).

Keep in mind, ACOS is not just about getting the lowest number. It’s about finding the right balance between visibility and profitability in your Amazon PPC strategy.

Good ACOS for Amazon FBA

If you’re an Amazon FBA seller, ACOS hits different because of those extra fees (storage, fulfilment, referrals—oh my!). FBA streamlines shipping, but it also eats into margins, so your “good” ACOS needs to account for that. Generally, aim for 20-30% to keep your FBA business thriving. Why is it higher than non-FBA? Because FBA fees can add 15-20% to your costs, squeezing your pre-ad profits.

For FBA newbies, a good ACOS during launch might be higher (30-40%) as you build momentum and reviews. Once established, dial it down to 15-25% for sustained growth. (“Ultimate Amazon Product Launch Strategy Guide for 2025”, 2025) Voice search tip: If you’re asking Alexa, “What’s a good ACOS for Amazon FBA?”—target under 25% for most categories to maximise your ROI.

Real-life example: An FBA seller I know sells kitchen gadgets at $30 each. After Amazon FBA fees (about $10), their margin is 30%. They set PPC bids to hit a 20% ACOS, spending $6 on ads per $30 sale. Result? $14 profit per unit after everything. If ACOS jumped to 35%, profit drops to $9.50—still okay, but not ideal for scaling.

Pro tips for FBA ACOS success:

• Factor in all costs: Use tools like Seller Central’s profit calculator to include FBA fees in your break-even ACOS.
• Bundle products: Increase average order value (AOV) to spread ad costs thinner.
• Monitor TACOS: Total ACOS (including organic sales) for a fuller picture of ad impact on overall revenue. To calculate TACOS, use the formula: (Ad Spend / Total Revenue) x 100. This allows you to assess not just the immediate efficiency of your advertising spend but also how your ads are influencing overall sales. For example, if you spend $100 on ads and your total revenue is $1000, your TACOS would be ($100 / $1000) x 100 = 10%. Aim to keep this percentage low to ensure ads are enhancing rather than hindering your total profitability.

For FBA sellers, a good ACOS is more than just a number. It helps you stay ahead of competitors and maintain your Prime status.

Amazon ACOS Benchmarks by Category

ACOS varies across Amazon’s different categories. What works in electronics may not work in beauty. Here are 2025 benchmarks from industry reports, specifically the 2025 Teikametrics Industry Report, to help you see if your PPC is competitive in your category.

These benchmarks come from aggregated Amazon ad data. If your ACOS is above average for your category, it’s time to audit bids and keywords. For instance, in electronics, a 24% ACOS means you’re spending $0.24 per sales dollar—fine if margins are 40%, but tweak if not.

Example: A beauty seller targeting “organic face cream” sees a 32% ACOS. By switching to exact-match keywords and adding negatives, they drop to 25%—boosting profits by 20%.

Use these as a starting point, but always benchmark against your own historical data for personalised insights.

How to Calculate Target ACOS

To figure out your target ACOS, match it to your pre-ad profit margin percentage. For example, if your margin is 30%, set your target ACOS at 30% or lower to avoid losing money.

Step-by-step formula:

1. Find your profit margin: (Selling Price – All Costs) / Selling Price x 100. Exclude ad spend here.
2. Set target ACOS: Aim below your margin. Target ACOS = Desired Profit Margin After Ads.
3. Monitor: Use Amazon’s reports or tools like Helium 10 for real-time calcs.

Example: Product sells for $50. Costs (COGS + fees) = $30. Margin = ($50 – $30) / $50 x 100 = 40%. Target ACOS: Under 40%. If you want 20% net profit, set the target at 20%.

Voice search optimised: “Alexa, how do I calculate target ACOS on Amazon?”—Subtract desired profit from your margin!

Tools like free ACOS calculators can automate this. Consider using popular options such as Helium 10, SellerApp, or even the basic Amazon Revenue Calculator. These tools help you track and adjust your ACOS effectively as costs fluctuate. Adjust quarterly for optimal results.

ACOS vs ROAS on Amazon

ACOS and ROAS are two sides of the same coin in Amazon PPC. ACOS measures cost efficiency (lower is better), while ROAS (Return on Ad Spend) measures revenue return (higher is better). Formula: ROAS = Ad Revenue / Ad Spend. They’re inverses: ROAS = 1 / (ACOS / 100). (“7 Amazon PPC Optimization Tips to Reduce ACoS in 2025”,)

For example, 25% ACOS = 4x ROAS ($4 revenue per $1 spent). ACOS is great for cost control, but ROAS shines for scaling—especially in growth phases.

When to use which? Focus on ACOS for tight margins; ROAS for big-picture ROI. Both help optimise Sponsored Display or Brands campaigns.

In practice: A 20% ACOS (5x ROAS) means strong performance. If ROAS dips below 3x, reassess.

Strategies to Optimise Your ACOS in 2025

To hit that good ACOS, layer in advanced tactics:

• Bid adjustments: Use automatic bidding but override for top performers.
• Seasonal tweaks: Ramp up during Prime Day; lower post-holidays.
• DSP integration: Combine with Amazon Demand Side Platform for broader reach.
• Data-driven decisions: Track CTR, CVR, and impressions weekly.

Example: During Q4, a toy seller boosts bids, accepting a 35% ACOS for volume, then dials back to 25% in Q1.

Conclusion: Nail Your ACOS and Watch Profits Soar

Whew, we’ve covered a lot—from what a good ACOS for Amazon PPC looks like (15-30%, folks!) to category benchmarks, calculations, and the ACOS vs ROAS showdown. Remember, success in Amazon FBA isn’t about chasing the lowest number; it’s about aligning ACOS with your goals for sustainable growth.

Ready to supercharge your PPC? If you need hands-on help, visit boostxllc.com to book a free consultation. You’ll walk away with a personalized 3-point ACOS reduction plan to enhance your campaign performance and profitability. What’s your current ACOS? Drop it in the comments!

FAQs

What ACOS should I aim for with a 30% profit margin?

With a 30% pre-ad margin, target an ACOS of 20-25% or lower to leave room for net profits. This ensures ads don’t eat all your earnings—calculate break-even as your margin percentage.

How does ACOS differ between launch, growth, and maturity phases?

In launch, expect 30-50% ACOS for visibility. Growth phase: 20-30% as sales ramp. Maturity: Under 20% for efficiency, focusing on maintenance bids.

Is 25% ACOS always better than 35% ACOS?

Not always! A 35% ACOS might be satisfactory for high-margin products or aggressive scaling, while 25% could limit reach in competitive categories. Prioritise profitability over the number.

How do I adjust target ACOS for seasonal spikes?

During peaks (e.g., holidays), raise target ACOS by 10-15% for volume. Post-spike, lower it to rebuild margins—use historical data to forecast.

When should I optimise for TACoS instead of ACOS?

Switch to TACoS (Total ACOS) when ads drive significant organic sales, like in maturity phases. It measures overall ad impact on total revenue, ideal for brand-building.