Why wholesale distributors are measuring GMROI to improve inventory profitability

Wholesale distributors are under constant pressure to balance inventory investment and maintain healthy profitability. Rising costs and tighter margins across many product categories mean distributors must pay closer attention to how their inventory value contributes to profit.

One metric that has become increasingly important for distributors is GMROI, or gross margin return on investment. According to the new Phocas Wholesale Distribution Inventory Trends Report, GMROI is now the most measured metric among wholesalers. It is often relied on it to determine which products to discount when inventory levels become too high.

Understanding and using GMROI can help distributors evaluate inventory profitability and improve inventory management jobs such as pricing and purchasing.

What is GMROI?

Gross margin return on inventory investment (GMROI) measures how much gross profit a business earns for every dollar invested in inventory. The metric connects two core factors of the wholesale distributors business and that is gross margin dollars and the average inventory cost required to generate those profits.

Many companies track sales growth or profit margin, but these numbers alone do not reveal whether the inventory investment required to generate those sales is efficient. A distributor might sell large volumes of products but still struggle with profitability if too much cash is tied up in inventory or if those products have lower margins.

GMROI helps solve this problem by showing the relationship between gross margin and inventory value. Because it combines both profitability and inventory efficiency, the metric provides a clearer picture of overall inventory profitability.

For distributors that manage thousands of SKU items across multiple product lines, this insight is particularly valuable. Another finding in the Phocas Wholesale Distribution Inventory Trends Report was 70% of distributors carry more than 5,000 SKUs so another contributing factor as to why this metric is measured so widely.

Why wholesalers measure GMROI

The Phocas Wholesale Distribution Inventory Trends Report found that GMROI is now the most measured metric among wholesalers. Distributors rely on it because it directly connects inventory performance to profit generation.

One major advantage of GMROI is that it links inventory investment with gross profit in a single calculation. While metrics like inventory turnover show how quickly items sell and profit margin measures product profitability, GMROI combines these factors to reveal how efficiently inventory produces profit.

This makes GMROI especially useful for identifying underperforming inventory. Distributors often carry a wide range of products across many product categories, and some of these items may not generate enough profit relative to their cost. When a product produces low GMROI, it may indicate that the company is holding too much inventory, that the product has a weak margin, or that demand is slower than expected.

By identifying these issues, purchasing, sales and finance can improve overall inventory management by adjusting purchasing decisions and reducing excess inventory.

Another reason distributors use GMROI is that it supports more accurate forecasting. When businesses understand which products deliver a higher GMROI, they can prioritize those items when planning future inventory purchases. This ensures that future inventory investment is directed toward products that generate stronger returns.

A typical explanation of the GMROI formula

The GMROI formula is straightforward and easy to apply.

The most common way to calculate GMROI
Gross Margin Dollars ÷ Average Inventory Cost

This GMROI calculation compares the profit generated from product sales with the amount of money invested in inventory.

To calculate gross margin dollars, businesses subtract cost of goods sold (COGS) from total sales. In other words, gross profit represents the revenue remaining after the direct cost of the products has been removed.

The second part of the equation is average inventory cost, which represents the typical value of inventory held during a specific time period. Companies often calculate this by averaging the beginning inventory value with the ending inventory cost.

When these numbers are combined, the result shows how much profit the business generates for every dollar invested in inventory.

For example, if a distributor generates $50,000 in gross margin dollars while maintaining an average inventory cost of $25,000, the GMROI would be 2. This means the company earns two dollars of gross profit for every dollar invested in inventory.

This simple calculation makes GMROI one of the most practical inventory management metrics available.

When to calculate GMROI

Most distributors calculate GMROI regularly to monitor changes in inventory profitability over time. Businesses commonly measure GMROI monthly, quarterly or annually depending on their reporting cycles.

Shorter reporting intervals allow companies to detect changes in performance more quickly. For example, calculating GMROI monthly allows distributors to monitor changes in inventory turnover, product demand and pricing strategies.

Many organizations also measure GMROI across different levels of their business. A distributor may evaluate GMROI by SKU, by product categories, by supplier or across entire product lines. This layered analysis helps businesses identify exactly where inventory is performing well and where adjustments may be required.

Because the metric can be measured at many levels, it becomes an important tool for both operational decision-making and strategic planning.

Using GMROI to enhance inventory management

One of the biggest benefits of GMROI is its ability to help businesses optimize inventory management.

Wholesale distributors constantly face the challenge of balancing inventory supply with demand. Holding too much inventory ties up cash and increases storage costs, while insufficient inventory can lead to lost sales and poor customer relationships and GMROI gives distributors insights into these dilemmas.

GMROI helps determine whether current inventory levels are generating adequate returns.

If a distributor notices low GMROI across certain products, it often indicates that inventory is sitting in the warehouse without generating enough profit. This can occur when items sell slowly or purchasing decisions have resulted in excess inventory.

On the other hand, products that generate higher GMROI typically combine strong demand with healthy margins. These products often justify greater inventory investment, as they deliver stronger gross margin return on inventory investment.

By focusing purchasing decisions on high-performing items, distributors can increase overall inventory profitability.

How GMROI helps with discounting decisions

Another key finding from the Phocas Wholesale Distribution Inventory Trends Report is that distributors frequently use GMROI to determine what products to discount.

When a product consistently shows low GMROI, it usually indicates that inventory is underperforming. Often this happens when the distributor has accumulated too much inventory for a particular SKU.

In these cases, discounting can help improve inventory turns and release capital tied up in slow-moving products. Reducing the price slightly may increase demand and allow the distributor to move inventory more quickly.

This approach can also help free up valuable shelf space in warehouses or distribution centers. Once slow-moving inventory is cleared, businesses can allocate that space to faster-moving or high-margin products that generate stronger returns.

Because GMROI measures both margin and inventory efficiency, it helps businesses determine whether a price reduction will ultimately improve profitability.

GMROI benchmarks

Many businesses compare their results against GMROI benchmarks to evaluate performance.

While benchmarks vary across industries, a common rule of thumb is that a GMROI above 1 indicates that inventory is generating more profit than it costs to hold.

However, many distributors and retail companies aim for a higher return to maximize inventory profitability. A good GMROI is often considered to fall between 2 and 3, while businesses with particularly strong product performance may achieve even higher results.

The right benchmark depends on the industry and the type of products sold. Businesses that sell commodity items or products with lower margins may naturally have lower GMROI values, while companies that specialize in premium or high-margin products may achieve stronger returns.

Because of this variation, many companies evaluate GMROI across individual product categories or product lines rather than relying on a single company-wide number.

Calculating GMROI and adding to dashboards or financial statements in Phocas

For organizations using Phocas, GMROI can be easily calculated as well as incorporated into analysis.

Within Phocas, teams can add GMROI as a custom calculation to dashboards or within financial statements. This allows business people to track gross margin return on inventory investment alongside other important KPIs such as revenue, COGS, profit margin and inventory turnover.

This integrated approach helps businesses understand how inventory investment impacts overall profitability.

As Phocas Inventory Analytics also allows users to analyze data by SKU, product categories and product lines, distributors can quickly identify where inventory performance is strongest and where improvements may be needed. This strong visibility supports better purchasing decisions, more accurate demand planning and improved inventory allocation across the business. In the current environment where supply chain uncertainty and rising costs continue to affect the wholesale industry, distributors need better ways to evaluate how inventory contributes to profitability.

GMROI measures the effectiveness of inventory by connecting gross margin, COGS and inventory investment into one powerful metric. By tracking gross margin return on inventory investment, businesses gain insight into which products generate the strongest returns and which products may be tying up too much capital.

It is no surprise that GMROI has become the most measured metric among wholesalers.