What is a good ACOS for Amazon ads?

For most FBA sellers a healthy ACOS sits between 15% and 30%. Above 30% is a warning sign unless your product margin is very high - the right target always depends on your profit margin.

ACOS vs ROAS, which matters more?

Both matter, but neither shows profit. ACOS tells you the share of sales spent on ads; ROAS tells you revenue per ad dollar. Ad ROI - net profit after COGS and ad spend - is the number that tells you whether a campaign is actually making money.

Is Amazon PPC worth it for FBA sellers?

Yes, for most products PPC is the fastest way to generate initial sales and ranking signals. The key is to measure net ad ROI, not just ACOS: a campaign can run at 25% ACOS and still be profitable when your margin is healthy.

How to lower ACOS quickly?

Five levers: reduce bids on low-converting keywords, add negative keywords, improve listing conversion (images, bullets, reviews), shift from broad to phrase/exact match, and time your spend around peak demand seasons.

Free alternatives to Helium 10 and Jungle Scout in 2026?

With Helium 10 raising prices and Jungle Scout reorganizing into the Catalyst line, free tools like ylishi.tools cover the core metrics FBA sellers need - FBA fee estimates, ad ROI, and promotion ROI - with no monthly subscription.

Amazon Ads ROI Calculator (2026) — Free ACOS & ROAS Tool

Last updated: 2026-09-18

Enter your ad spend, attributed sales, and cost of goods to instantly see your ACOS, ROAS, and true net return on advertising. No signup, no credit card — a free alternative to paid Amazon seller suites.

Ad ROI Calculator

Ad Spend ($)

Attributed Sales ($)

COGS + Other Costs ($)

What Is Amazon Ad ROI?

Amazon Ad ROI (Return on Investment) measures the net profit generated from your advertising spend relative to the cost. While many sellers focus solely on ACOS (Advertising Cost of Sale), true ROI reveals whether your ads are actually growing your bottom line. For FBA sellers, this is critical: high sales volume doesn’t equal profit if ad costs eat into margins. Measuring ROI helps you distinguish between campaigns that drive traffic and those that drive sustainable profit.

ACOS vs ROAS: What's the Difference?

Metric	What It Measures	Formula	Good Value
ACOS	Percentage of sales spent on ads	Ad Spend / Attributed Sales	15%–30%
ROAS	Revenue generated per dollar spent	Attributed Sales / Ad Spend	3.0–6.0+

ACOS tells you how much you’re spending to earn $1 in sales. ROAS tells you how much sales you earn per $1 spent. Both are useful, but neither shows profit — that’s where ROI comes in.

How to Calculate Amazon Advertising ROI (Step by Step)

Let’s walk through a real example:

Item	Amount
Ad Spend	$500
Attributed Sales	$2,000
COGS	$900

Step 1: Calculate gross profit = Sales - COGS = $2,000 - $900 = $1,100
Step 2: Calculate net ad profit = Gross profit - Ad spend = $1,100 - $500 = $600
Step 3: Calculate ad ROI = Net ad profit / Ad spend = $600 / $500 = 120%
Step 4: ACOS = $500 / $2,000 = 25%
Step 5: ROAS = $2,000 / $500 = 4.0

This means your ads generated $600 in net profit — a 120% return. Even with a 25% ACOS, your campaign is profitable because your product margin is healthy. Use our FBA fee calculator to factor in all costs and get a complete picture.

Free vs Paid Amazon Tools in 2026

In 2026, Helium 10 raised prices and dropped its Starter plan, while Jungle Scout reorganized into the Catalyst line with Growth Accelerator at $34/mo. As subscription costs rise, smaller FBA sellers are turning to free, no-frills tools like ylishi.tools to track core metrics without monthly fees.

How to Lower Your ACOS

Optimize bids: Reduce bids on low-converting keywords and increase bids on high-ROAS terms.
Use negative keywords: Block irrelevant searches that waste spend without sales.
Improve listing quality: Higher conversion rates from better images, bullet points, and reviews reduce ACOS naturally.
Test targeting match types: Use phrase and exact match to reduce wasted impressions from broad match.
Time campaigns around seasons: Increase spend during peak demand and pause during lulls to maintain healthy ACOS.

For a full strategy on maximizing promotional ROI, check out our Promotion ROI Calculator to compare ad performance with coupon and deal campaigns.

More Free Amazon Seller Tools

Estimate FBA fees and compare promotion strategies at no cost.

FBA Fee Calculator Promotion ROI Calculator