GMROI By Category Calculator
Compare how many gross-margin dollars each product category returns per dollar of inventory investment — GMROI at the category level.
How it works
GMROI = gross margin dollars ÷ average inventory at cost · Gross margin = sales × margin% · Inventory turns = COGS ÷ average inventory
GMROI (gross margin return on inventory investment) answers a question sales alone cannot: how many margin dollars does a category return for every dollar tied up in its stock? It combines margin and turnover, so a low-margin category that sells fast can beat a high-margin one that sits on the shelf. A GMROI above 1.0 means the category generates more gross margin than the cost of the inventory it holds; retailers use it to compare categories and decide where to invest open-to-buy dollars.
Worked example
A category with $250,000 in annual sales at a 45% margin produces $112,500 of gross margin. Held against $60,000 of average inventory at cost, GMROI is 112,500 ÷ 60,000 = 1.88 — every inventory dollar returns $1.88 in gross margin, on about 2.29 inventory turns.
Frequently asked questions
What does a GMROI of 1.88 mean?
It means the category generates $1.88 of gross margin for every $1.00 invested in its average inventory over the year. Above 1.0 the category earns more margin than the stock costs; below 1.0 it does not.
Why is GMROI better than margin or turnover alone?
High margin with slow turns can tie up cash, while thin margin with fast turns can be very profitable. GMROI multiplies the two, so it fairly compares a slow luxury category against a fast staple category on the same scale.
Should inventory be valued at cost or retail?
GMROI uses average inventory at cost, matched against gross margin dollars. Mixing cost and retail bases produces a meaningless ratio, so keep both the margin and the inventory figure on a cost basis.
Related calculators
Educational estimate, not financial advice.