Gross Margin Return on Inventory Calculator
GMROI measures gross margin earned relative to average inventory investment at cost over a selected period.
How to use this calculator
- Enter gross margin dollars and average inventory cost for the same period.
- Confirm that all inputs use the stated units and the same population, period or scope.
- Change one assumption at a time when comparing scenarios.
Formula used by the gmroi calculator calculator
GMROI = gross margin dollars ÷ average inventory cost
- GMROI = gross margin dollars ÷ average inventory cost
- Period lengths, inventory valuation methods and gross-margin definitions must be consistent to compare results.
- Inputs are validated against required ranges and outputs are rounded for readability.
Worked examples
Worked example
18,000 gross margin dollars and 12,000 average inventory cost.
GMROI is 1.5× for the stated period.
GMROI is 1.5× for the stated period.
Understanding the result
GMROI measures gross margin earned relative to average inventory investment at cost over a selected period.
Period lengths, inventory valuation methods and gross-margin definitions must be consistent to compare results.
Important notes
Period lengths, inventory valuation methods and gross-margin definitions must be consistent to compare results.
Use the result as a calculation aid for the inputs supplied; confirm critical specifications independently.
Frequently asked questions
What does 1.5× mean?
It means 1.50 currency units of gross margin per currency unit of average inventory cost during that period.
Is it annualised automatically?
No; use a consistent reporting period when comparing figures.
How do I use this calculator?
Enter gross margin dollars and average inventory cost for the same period.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- How to Calculate ROI — Learn the return on investment formula and how to interpret profit, cost, and percentage return.
- APY vs Interest Rate: What Is the Difference? — Understand APY, nominal interest rates, and how compounding changes the effective annual return.
- Markup — Learn what markup means, how markup is calculated from cost and selling price, and how it differs from margin.
This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.