Are you an Amazon FBA seller tired of staring at stagnant sales figures and wondering what's next? You're not alone. Many sellers get discouraged when their initial burst of sales slows down. But what if there's more to the story than just the headline numbers?

While sales figures are undoubtedly important, there's a whole world of valuable information hidden beneath the surface. These "hidden metrics" provide deeper insights into your Amazon FBA business and greatly help you identify areas for improvement and unlock new growth potential.

In this blog, we'll dive deeper into three crucial hidden metrics that every FBA seller should be tracking.

Here are the three most crucial indicators that can turn the Amazon FBA profit tables for you.

1. Inventory Performance Index (IPI):

This metric goes beyond just the number of units you sell and sheds light on how efficiently you're utilizing Amazon's storage space. A healthy IPI score can save you money and ensure you have the inventory you need to meet customer demand.

2. Return on Ad Spend (ROAS):

Not all clicks and impressions are created equal. ROAS helps you understand the true effectiveness of your advertising efforts. By tracking ROAS, you can identify which ad campaigns are generating actual sales and optimize your spending for maximum return.

3. Customer Acquisition Cost (CAC):

Knowing how much it costs to acquire a new customer is essential for long-term profitability. CAC allows you to evaluate the efficiency of your marketing efforts and identify areas where you can attract customers at a lower cost.

Buckle up and get ready to explore these gems of metrics with more details to secure your Amazon FBA success!

Inventory Performance Index (IPI)

What is IPI?

The Inventory Performance Index (IPI) is a metric developed by Amazon to assess the efficiency of your inventory management within the FBA program. It essentially measures how well you're utilizing Amazon's storage space and reflects your ability to keep in-stock inventory while avoiding unnecessary storage fees.

Here's a breakdown of what IPI considers:

Storage Fees: This includes both standard and removal order fees incurred for storing your inventory in Amazon fulfillment centers.

Excess Inventory:  IPI takes into account the amount of inventory that has been in storage for extended periods, indicating potential overstocking.

Sell-Through Rate: This refers to the rate at which your inventory is being sold. A high sell-through rate demonstrates efficient inventory management.

By analyzing these factors, IPI provides a single score that indicates your overall inventory performance.

Why is IPI Important for FBA Sellers?

Maintaining a good IPI score is crucial for your success as an FBA seller. Here's why:

Storage Restrictions: A low IPI score can lead to storage limitations. Amazon may restrict the amount of inventory you can store in their fulfillment centers, hindering your ability to meet customer demand.

Increased Fees: Sellers with consistently low IPI scores may face additional storage fees as a penalty for inefficient inventory management. These fees can significantly eat into your profits.

On the other hand, a healthy IPI score offers significant benefits:

Improved Storage Eligibility:  A good IPI score ensures you have ample storage space to accommodate your inventory needs. This allows you to maintain healthy stock levels and
avoid stockouts.

Cost Savings: By optimizing your inventory management based on IPI, you can minimize storage fees and maximize your profit margins.

How to Track and Improve IPI?

Tracking your IPI is easy. You can find your current score and historical data within your Seller Central account under the "Inventory" tab.  Look for the "Inventory Performance Index" section.

Here are some strategies to keep your IPI in good standing:

Forecasting Demand: Accurately forecasting product demand is essential. Utilize sales data, seasonality trends, and competitor analysis to predict future sales and adjust inventory levels accordingly.

Managing Inventory Levels:  Avoid overstocking by setting appropriate reorder points for your products. Regularly review your inventory levels and adjust them based on sales trends. Amazon also offers inventory management tools like FBA Replenishment Orders to automate this process.

Long-term Partnership With A Reliable Supplier: Establishing a long-term partnership with a reliable wholesale supplier is indispensable. Find a wholesaler who not only offers retailer-friendly prices but also holds an effective logistics network.

Using FBA Inventory Tools: Seller Central provides several tools to help you manage your inventory effectively. Utilize tools like "Inventory Age" reports to identify slow-moving products and consider clearance sales or promotions to move them.

Case Study

Sarah is an Amazon FBA seller who sells handmade candles. Initially, Sarah wasn't paying close attention to her IPI and ended up with a significant amount of leftover seasonal stock after the holidays. This led to excess inventory fees and storage limitations. By implementing IPI tracking and utilizing inventory forecasting tools, Sarah was able to predict demand for upcoming seasons and adjust her inventory levels accordingly. This resulted in a significant improvement in her IPI score that allowed her to avoid storage restrictions and optimize her storage costs.

By keeping a close eye on your IPI and implementing these strategies, you can ensure efficient inventory management, avoid unnecessary fees, and pave the way for a more profitable FBA business.

Return on Ad Spend (ROAS):

Understanding Your Advertising ROI

In the fast-paced world of Amazon FBA, advertising plays a crucial role in driving sales and product visibility. However, simply throwing money at ads isn't enough. To ensure your advertising efforts are truly effective, you need to understand the concept of Return on Ad Spend (ROAS).

What is ROAS?

ROAS is a metric that measures the efficiency of your advertising campaigns. It essentially tells you how much revenue you generate for every dollar you spend on advertising. By calculating your ROAS, you can assess whether your advertising efforts are translating into actual sales and profitability.

Here's the formula for calculating ROAS:

ROAS = Total Ad Sales / Total Ad Spend

Why is ROAS Important for FBA Sellers?

Many sellers rely on vanity metrics like clicks or impressions to gauge the success of their ads. However, these metrics don't tell the whole story. Just because someone clicks on your ad doesn't guarantee a sale.

ROAS provides a much clearer picture. By focusing on ROAS, you gain valuable insights like:

Profitability of Campaigns:  A high ROAS indicates that your ad campaigns are generating more revenue than they're costing you. This allows you to identify the campaigns that are truly driving your business forward.

Efficiency of Spending:  Analyzing ROAS helps you identify areas where you can optimize your advertising budget. By focusing on campaigns with high ROAS, you can maximize
your return on investment (ROI).

How to Track and Improve ROAS?

Finding your ROAS data is easy. Within your Seller Central account, navigate to the Advertising section. Here, you'll find detailed reports on the performance of your advertising campaigns, including total ad spend and ad sales generated.

Here are some strategies to improve your ROAS and get the most out of your advertising budget:

Target the Right Audience:  Ensure your ads are reaching the right people by utilizing effective targeting strategies. Leverage demographics, interests, and product behavior data to narrow down your audience and ensure your ads are seen by potential
customers who are genuinely interested in your products.

Optimize Ad Copy and Bids:  The quality of your ad copy directly impacts click-through rates (CTR) and conversion rates. Craft compelling ad copy that highlights the unique selling points of your product and encourages clicks. Additionally, consider optimizing your bids to ensure your ads are displayed prominently for relevant searches.

A/B Testing:  Don't be afraid to experiment! A/B testing allows you to compare different versions of your ad copy, visuals, and targeting strategies. By analyzing the results, you can identify which elements resonate best with your target audience and refine your campaigns for maximum effectiveness. 

Case Study:

John is an FBA seller of athletic wear who initially focused on maximizing clicks on his advertising campaigns. However, his sales figures weren't reflecting the high click-through rate. After discovering ROAS, John realized his campaigns weren't generating enough revenue to justify the ad spend. By implementing A/B testing, John optimized his ad copy to target a more specific audience of fitness enthusiasts. Additionally, he adjusted his bids to prioritize higher placements for relevant keywords. As a result of these optimizations, John's ROAS improved significantly, indicating that his ads were now reaching the right audience and driving actual sales.

By tracking and analyzing your ROAS, you gain the power to make data-driven decisions about your advertising efforts. By focusing on maximizing ROAS, you can ensure your advertising dollars are working hard for you and propelling your FBA business toward sustainable growth.

Customer Acquisition Cost (CAC):

Acquiring new customers is the lifeblood of any business, and the world of Amazon FBA is no exception. You pour your heart and effort into creating high-quality products, but attracting customers requires additional investment. This is where Customer Acquisition Cost (CAC) comes into play.

What is CAC?

CAC is a metric that reveals the average cost associated with acquiring a new customer. In simpler terms, it tells you how much you're spending on marketing and sales efforts to convert a single visitor into a paying customer. Understanding your CAC is crucial for evaluating the long-term profitability of your FBA business.

Here's the formula for calculating CAC:

CAC = Total Marketing & Sales Spend / Number of New Customers Acquired

Why is CAC Important for FBA Sellers?

While acquiring new customers is essential, it shouldn't come at an unsustainable cost. Knowing your CAC allows you to:

Maintain Profitability:  A healthy business model ensures your CAC is lower than the average customer lifetime value (CLTV). CLTV represents the total revenue a customer generates throughout their relationship with your brand. If your CAC is higher than CLTV, you're essentially losing money on every new customer acquired.

Evaluate Marketing Efforts:  By analyzing CAC alongside the effectiveness of different marketing channels, you can identify areas for improvement. Are certain channels generating new customers at a lower cost? Should you shift your focus towards more cost-effective strategies? CAC helps you answer these questions and optimize your marketing budget.

How to Track and Reduce CAC?

Tracking your CAC is straightforward. Seller Central provides detailed reports on your advertising expenses and other marketing costs within the Advertising and Business Reports sections.

Here are some strategies to reduce your CAC and maximize the return on your marketing investment:

Focus on High-Converting Channels:  Not all marketing channels are created equal. Analyze which channels (e.g., social media marketing, influencer marketing) are generating the most new customers at the lowest cost. Focus your efforts on those channels and refine your strategies to further enhance their effectiveness.

Optimize Product Listings:  Effective product listings are essential for organic traffic and
customer acquisition. Utilize high-quality product images, compelling descriptions, and relevant keywords to ensure your products rank high in search results. A well-optimized listing can significantly improve your organic conversion rate, reducing your reliance on paid advertising and lowering your CAC.

Leverage Organic Traffic:  Organic traffic refers to visitors who discover your products through search engines or other unpaid channels. By optimizing your listings and utilizing SEO best practices, you can attract potential customers organically. This not only reduces reliance on paid advertising but also builds brand trust and loyalty, potentially increasing customer lifetime value.

Case Study

Emily is an FBA seller of high-demand household items. Initially, Emily relied heavily on paid advertising to drive traffic to her product listings. However, her CAC was high, raising concerns about profitability. By focusing on optimizing her product listings with relevant keywords and high-quality product photos, Emily's organic traffic increased significantly. This resulted in a lower CAC as she acquired new customers without relying solely on paid advertising. Additionally, Emily started engaging with potential customers on social media platforms, further building brand awareness and attracting organic traffic at no additional cost.

By keeping a close eye on your CAC and implementing these strategies, you can make informed decisions about your marketing efforts and ensure you're acquiring new customers at a sustainable cost. Remember, a lower CAC paves the way for long-term profitability and empowers your FBA business to flourish.


In the fast-paced world of Amazon FBA, focusing solely on sales figures paints an incomplete picture. By venturing beyond the surface and tracking the hidden metrics explored in this blog - Inventory Performance Index (IPI), Return on Ad Spend (ROAS), and Customer Acquisition Cost (CAC) - you unlock a treasure trove of valuable insights.

By actively tracking these hidden metrics, you gain the power to make data-driven decisions that optimize your FBA operations. These insights empower you to adjust inventory levels, refine advertising campaigns, and fine-tune your marketing strategies. Ultimately, mastering these hidden metrics paves the way for sustainable growth and propels your FBA business towards success.

Are you ready to unlock the hidden potential within your FBA business? Connect with UTN Wholesale and keep receiving valuable education and insights regarding the world of Amazon FBA!


My IPI score is low. How can I improve it quickly?

Sell off slow-moving inventory and adjust reorder points to optimize stock levels for in-demand products.

How often should I track ROAS?

Track ROAS at least weekly for ongoing campaigns. Consider individual ad group tracking for deeper insights.

What are cost-effective ways to acquire new customers?

Utilize SEO optimization and social media engagement to attract new customers at a lower cost.

Is High CAC a sign of trouble?

A high CAC compared to your CLTV (customer lifetime value) suggests you're spending too much to acquire customers.

Can removal orders help my IPI?

While they free up space, removal orders come with extra fees. Focus on optimizing inventory levels instead.

Are there tools to track hidden metrics?

Seller Central offers reports on inventory, advertising, and marketing costs. Explore third-party FBA management tools for advanced analytics.

I'm new to FBA ads. How do I track ROAS?

Set campaign goals, define your target audience, and use Seller Central's advertising reports to calculate ROAS and optimize performance.

My ads get lots of clicks but few sales. What's wrong?

A high click-through rate (CTR) means your ad grabs attention, but it doesn't guarantee sales. Focus on a good conversion rate (clicks turning into sales) for a high ROAS.

How can I optimize my product listings?

Conduct keyword research, use high-quality product images, and write compelling descriptions highlighting your product's unique selling points.

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