01
Use the GMROI formula
Divide gross profit by average inventory at cost for the same period.
InventoryFREE · NO SIGNUP
GMROI Calculator
Calculate gross margin return on inventory investment directly or derive the inputs from one consistent retail period.
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01 USE IT NOW02 NO ACCOUNT03 FIELD NOTES BELOW
WORKING INPUTS
Keep margin and inventory on one cost basis.
LIVE RESULT
GMROI
1.25×Gross profit per dollar of average inventory at cost; compare like periods, categories, and accounting bases.GROSS PROFIT$150,000.00
AVERAGE INVENTORY$120,000.00
GMROI PERCENTAGE125.00%
INPUT METHODDerived
12
MARGIN ON INVENTORY CAPITAL
Make the numerator and denominator comparable.
GMROI says how many gross-margin dollars a retailer generated for each dollar held in average inventory at cost.
WORKING VIEW
1.25 GMROI$150K GROSS PROFIT · $120K INVENTORY
METHODgross profit ÷ average inventory at cost
WORKING NOTE$1.25 gross profit per inventory dollar · 125.00%
INPUTS → CLEAR OUTPUT
THE FIELD NOTES
Quick answer above. Better decisions below.
Use the result now, then read the practical notes for assumptions, examples, limitations, and the choices behind it.
$150K GROSS PROFIT · $120K INVENTORY1.25 GMROI
$1.25 gross profit per inventory dollar · 125.00%
02
Keep inventory on a cost basis
Do not divide gross profit by inventory valued at retail price.
03
Compare like with like
A higher GMROI can come from margin, faster stock movement, or both.
04
Avoid a universal benchmark
Healthy GMROI varies by category, season, assortment, and operating model.
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Use the GMROI formula
Divide gross profit by average inventory at cost for the same period.
The ratio can be shown as dollars per inventory dollar or multiplied by 100 for a percentage.
Keep inventory on a cost basis
Do not divide gross profit by inventory valued at retail price.
Use a representative average inventory balance when seasonality makes a simple beginning-and-ending average misleading.
Compare like with like
A higher GMROI can come from margin, faster stock movement, or both.
Compare the same category, period, and accounting policy before drawing a merchandising conclusion.
Avoid a universal benchmark
Healthy GMROI varies by category, season, assortment, and operating model.
The calculator reports the ratio and inputs; it does not label a business good or bad.
Questions, answered.
How do I calculate GMROI?
Divide gross profit for a period by average inventory valued at cost for that same period.
What does a GMROI of 2 mean?
It means the modeled period generated two dollars of gross profit for each dollar held in average inventory at cost.
Should average inventory use cost or retail value?
Use inventory at cost so the denominator is compatible with gross profit and comparable across periods.
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