GMROI (gross margin return on inventory) measures how many gross-margin dollars a retailer earns for every dollar invested in inventory at cost. It is calculated as gross margin ($) ÷ average inventory at cost. A GMROI of 2.5× means $2.50 of margin is earned per $1.00 of inventory held.

What is a good GMROI for apparel?

It varies by category and model — there is no universal target. Full-price fashion and accessories often run higher, while basics and replenishment categories with deeper inventory can run lower and still be healthy. Use GMROI to compare categories against each other and against plan, not against a fixed number.

How is GMROI different from gross margin percentage?

Gross margin percentage measures profitability on sales alone. GMROI adds the inventory dimension: a category can have a strong margin percentage but a weak GMROI if it carries too much stock to generate it. GMROI rewards margin earned efficiently against the inventory investment.

How can apparel brands improve GMROI?

By protecting margin (fewer reactive markdowns) and by holding less inventory to earn it — sharper assortments, better size curves, tighter open-to-buy, and faster replenishment of what sells. GMROI improves when buying and planning decisions stay connected to actual sell-through rather than drifting in separate spreadsheets.

// Tools

GMROI calculator

GMROI (gross margin return on inventory) is how many gross-margin dollars you earn per dollar of inventory — gross margin ($) ÷ average inventory at cost. A result above 1.0× means margin exceeds the inventory investment.

Net sales ($)

Cost of goods sold ($)

Average inventory (at cost, $)

Enter net sales, COGS, and average inventory to see GMROI.

// How it works

01
Enter net sales and COGS
Net sales and cost of goods sold for the period.
02
Enter average inventory at cost
Average inventory value at cost over the same period.
03
Read GMROI
GMROI = gross margin ($) ÷ average inventory at cost. Above 1.0× means margin exceeds the inventory investment.

// Reading the result · where spreadsheets break

Read GMROI against plan and against your other categories, not against a single benchmark. Below 1.0× the category is not returning its margin on the inventory it ties up; a high figure can flag underbuying as easily as efficiency. The useful question is whether GMROI is trending toward plan as the season trades.

In a spreadsheet, GMROI is a month-end snapshot — margin lives in one file, inventory at cost in another, and the two are reconciled by hand after decisions are already made. By the time a weak category surfaces, the lever left is markdown. The value is in seeing it where buying decisions happen, while there is still time to act.

// FAQ

Frequently asked questions

What is GMROI?: GMROI (gross margin return on inventory) measures how many gross-margin dollars a retailer earns for every dollar invested in inventory at cost. It is calculated as gross margin ($) ÷ average inventory at cost. A GMROI of 2.5× means $2.50 of margin is earned per $1.00 of inventory held.
What is a good GMROI for apparel?: It varies by category and model — there is no universal target. Full-price fashion and accessories often run higher, while basics and replenishment categories with deeper inventory can run lower and still be healthy. Use GMROI to compare categories against each other and against plan, not against a fixed number.
How is GMROI different from gross margin percentage?: Gross margin percentage measures profitability on sales alone. GMROI adds the inventory dimension: a category can have a strong margin percentage but a weak GMROI if it carries too much stock to generate it. GMROI rewards margin earned efficiently against the inventory investment.
How can apparel brands improve GMROI?: By protecting margin (fewer reactive markdowns) and by holding less inventory to earn it — sharper assortments, better size curves, tighter open-to-buy, and faster replenishment of what sells. GMROI improves when buying and planning decisions stay connected to actual sell-through rather than drifting in separate spreadsheets.

// Related resources

See the connected workflow in RetailNorthstar →

GMROI is most actionable at the category and class level, tracked against plan. RetailNorthstar surfaces it where buying decisions happen — see more retail tools.

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