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GMROI calculator

Compute gross margin return on inventory investment.

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The GMROI calculator turns Annual gross margin, Average inventory cost into GMROI, instantly and for free. For instance, with Annual gross margin = $100,000.00 and Average inventory cost = $40,000.00 it returns GMROI = 2.5.

How to use it

  1. Enter your values: Annual gross margin, Average inventory cost.
  2. Read the result instantly: GMROI.

Frequently asked questions

What does the GMROI calculator actually compute?

It takes Annual gross margin and Average inventory cost and derives GMROI from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

2 values: Annual gross margin ($) and Average inventory cost ($). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Annual gross margin = $100,000.00 and Average inventory cost = $40,000.00, the calculator returns GMROI = 2.5. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Annual gross margin = $110,000.00 and Average inventory cost = $80,000.00 instead, GMROI goes from 2.5 to 1.375 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Annual gross margin = $90,000.00 and Average inventory cost = $20,000.00, GMROI comes out at 4.5. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Running the week: issuing an invoice or a quote, knowing what is in stock and what to reorder, and seeing whether cash covers what is due.

What is the most common mistake?

Reading profit as cash. A profitable month with sixty-day payment terms can still leave the account empty — the two numbers answer different questions.

What is the difference between the GMROI calculator and the Inventory period calculator?

This one returns GMROI; the Inventory period calculator returns Inventory period (days) and Inventory turnover (×). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Cost of goods sold (COGS) calculator is the closest one after this: Compute cost of goods sold from beginning inventory, purchases and ending inventory.

What else is worth having open alongside it?

Fixed charge coverage ratio (FCCR) calculator and Quick ratio calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
ExplainerGMROI: the Inventory Number That Outranks MarginGross margin return on inventory investment divides gross margin by the cash tied up in stock. It exists because margin alone ranks products wrongly: a 60% margin turning twice a year loses to a 25% margin turning twelve times.ExplainerThe Cash Conversion Cycle: the Number That Explains Why You Are Out of CashCCC = DIO + DSO − DPO. It is the number of days your cash is out of your hands, and it is the reason a profitable, growing business runs out of money. Worked end to end, with the negative-cycle case that makes suppliers your cheapest lender.ExplainerThe EOQ Square-Root Formula, and Where It Stops Being TrueEOQ = √(2DS/H) balances ordering cost against holding cost. Its most useful property is how flat the cost curve is around the optimum — and its four failure modes are quantity discounts, lumpy demand, a finite replenishment rate, and the two inputs nobody can measure.ExplainerFixed-Charge Cover: the Ratio a Landlord or a Lender Looks AtThe same company, the same year, reads 1.02×, 1.52× or 2.56× depending on where rent is put and whether principal is grossed up for tax. Two of those pass a 1.25 covenant and one does not.ComparisonEBITDA vs EBIT vs Net Income: One P&L, Three AnswersWalked down one $10M P&L: EBITDA of $1.8M, EBIT of $1.1M, net income of $525K. The gap is 70.8 percent of EBITDA — and it is the cost of the assets and the debt the business actually runs on.ComparisonStraight-Line vs Declining-Balance DepreciationBoth methods write off exactly the same total cost. Only the timing differs — and timing is worth money. A full year-by-year schedule for one asset, the crossover year, the switch-to-straight-line convention, and the present value of the tax deferral computed at 8%.