GMROI Calculator
Find gross margin return on inventory investment.
Results update as you type.
How it works
GMROI, gross margin return on inventory investment, measures how much gross profit a retailer earns for every dollar invested in inventory, and this calculator computes it from gross margin and average inventory cost. You enter the gross margin in dollars earned over a period and the average cost value of the inventory you held during that period, and it returns the GMROI. This ratio is one of the most important metrics in retail and merchandising because it links profitability directly to the capital tied up in stock, answering whether your inventory is actually earning its keep. A GMROI of, say, three means every dollar invested in inventory generated three dollars of gross margin. Values above one indicate the inventory is profitable; below one means it is losing money once the investment is accounted for. GMROI is especially useful for comparing product lines, categories, departments, or suppliers on a level playing field, revealing which items deliver strong margins relative to the cash they consume and which are slow movers draining working capital. Retailers use it to make buying, pricing, markdown, and assortment decisions. Improve GMROI by raising margins, increasing turnover, or reducing average inventory. Enter your gross margin and average inventory cost to compute your GMROI.
GMROI = gross margin $ / average inventory cost $
GMROI divides the gross margin earned over a period by the average cost value of inventory held during that period. It shows how many dollars of gross profit each dollar invested in inventory returns. A GMROI above one means inventory is profitable; retailers often target values well above one, such as three or more.
Source:Retail merchandising
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter gross margin ($) and average inventory cost ($).
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
GMROI updates instantly as you type — no button to press.
Frequently asked questions
What is GMROI?
GMROI, or gross margin return on inventory investment, measures how much gross profit is earned for each dollar invested in inventory. It divides gross margin dollars by the average cost of inventory. A key retail metric, it reveals whether the money tied up in stock is generating enough profit to justify the investment.
How do you calculate GMROI?
Divide the gross margin earned over a period by the average inventory cost during that period. If you earned one hundred thousand dollars of gross margin on forty thousand dollars of average inventory, GMROI is 2.5. Use the cost value of inventory, not its retail value, and match the time periods for an accurate result.
What is a good GMROI?
A GMROI above one means the inventory is profitable after accounting for its cost, and many retailers target values well above that, such as three or more, though healthy benchmarks vary by industry and product type. Fast-moving, high-margin goods score higher, while slow sellers score lower. Compare GMROI across your own categories to guide decisions.
How is GMROI different from gross margin?
Gross margin measures profitability on sales, while GMROI measures profitability relative to the inventory investment required to generate those sales. A product can have a high margin but poor GMROI if it sells slowly and ties up lots of stock. GMROI combines margin and turnover, giving a fuller picture of inventory performance.
How can I improve GMROI?
Raise gross margin through better pricing or lower cost of goods, increase inventory turnover so the same stock generates more sales, or reduce the average inventory you carry. Because GMROI combines margin and turnover, improving either lifts it. Cutting slow-moving stock and focusing on high-return items are common ways retailers boost GMROI.