GMROI Calculator

How to use the GMROI Calculator

Measure gross margin dollars earned per currency unit invested in average inventory at cost. Enter a gross profit amount, not a percentage.

Formula

GMROI = gross margin amount ÷ average inventory cost.

Worked example

$30,000 gross margin dollars divided by $12,000 average inventory gives 2.5× GMROI.

Interpretation and limitations

Use matching periods and a representative average inventory balance. This is a gross-return measure and does not subtract every operating expense.

GMROI questions

Does 2.5× mean 250% net profit?

No. It means $2.50 of gross margin for each $1 held in average inventory under the selected period and valuation.

Which gross margin input is required?

Enter the currency amount of gross profit. Entering 40 for a 40% margin would be incorrect unless the gross profit actually equals 40 currency units.

Continue your calculation

For the next step, use the Gross Profit Calculator or the Inventory Turnover Calculator. Review each tool’s input definitions before carrying a result into another calculation.

Frequently asked questions

Is this calculator free?

Yes. It runs in your browser and does not require an account.

How should I use the result?

Use the result as a planning estimate and verify business-critical decisions against your source records.