The GMROI formula
GMROI = Gross Margin ÷ Average Inventory Cost (at cost, not retail value). For example, if a product line generates $50,000 in gross margin over a year and you carried an average of $20,000 worth of that inventory (at cost) during the year, GMROI is 2.5 meaning every dollar tied up in that inventory generated $2.50 of gross profit.
A GMROI of 1.0 means you broke even relative to the capital tied up (ignoring other holding costs); higher is better. What counts as a "good" GMROI varies significantly by industry, so it is most useful compared against your own historical trend or your own product lines against each other, rather than a universal benchmark.
Why GMROI matters more than margin alone
Margin percentage tells you how profitable a sale is, but not how efficiently that profit was generated relative to the inventory investment required. A product with a 60% margin that sits in stock for eight months before selling ties up capital much longer than a product with a 30% margin that turns over in three weeks the second product can easily have a better GMROI, because the same capital can be reinvested and turned into profit multiple times in the period it takes the first product to sell once.
This is why GMROI is a useful lens for deciding which product lines to expand, which to prune, and where to focus purchasing and merchandising attention especially when comparing across categories where margin and turnover both differ.
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