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Inventory Turnover Calculator

Calculates inventory turnover, days of stock on hand, weeks of cover, sell-through rate and GMROI from your cost of goods sold.

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Enter your figures and press Calculate.
In short Inventory Turnover Calculator is a free online tool on inputtesthub.com that calculates inventory turnover, days of stock on hand, weeks of cover, sell-through rate and GMROI from your cost of goods sold. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Inventory Turnover Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Inventory Turnover Calculator

The Inventory Turnover Calculator calculates inventory turnover, days of stock on hand, weeks of cover, sell-through rate and GMROI from your cost of goods sold. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Seeing how long your capital sits on a shelf.
  • Comparing two product lines on return rather than on margin.
  • Setting a weeks-of-cover target for buying.

Details

General retailRoughly 4–6 turns a year
Groceries12 or more
Furniture and jewellery1–2
GMROI above 3Generally healthy
Both sides at costMixing retail value inflates the ratio

The maths behind it

This tool uses turnover = cost of goods sold ÷ average inventory at cost. Days inventory outstanding = days in the period ÷ turnover, and GMROI = gross profit ÷ average inventory at cost. Every intermediate value is shown on screen, so the result can be checked by hand.

Both sides of the fraction must be at cost. Using retail-valued inventory against cost-based COGS is the most common way this number ends up flattering, and it flatters most on high-margin lines — exactly where the error is easiest to believe.

Where this tool stops

Average inventory taken as one figure hides seasonality, which for most retailers is where the money is stuck. A simple average of opening and closing stock will read very differently from a monthly average across a year with a peak in it.

Frequently asked questions

What is a good inventory turnover ratio?
It is meaningless without the category. Groceries turn a dozen times a year and jewellery once or twice, and both can be well run. The useful comparison is against your own history and against lines within the same shop — a ratio that is falling while margin is flat means capital is backing up.
Why is GMROI better than turnover on its own?
Because turnover ignores what you earn per turn. A line that turns eight times on a 10% margin returns less per pound of stock than one turning three times on a 45% margin. GMROI multiplies the two together and answers the question that actually matters: what does a pound tied up in this product earn?
Is the Inventory Turnover Calculator free?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Is what I paste into the Inventory Turnover Calculator stored?
No. The Inventory Turnover Calculator runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
How is the result calculated?
It uses turnover = cost of goods sold ÷ average inventory at cost. Days inventory outstanding = days in the period ÷ turnover, and GMROI = gross profit ÷ average inventory at cost. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What is the Inventory Turnover Calculator used for?
The jobs it is built for: seeing how long your capital sits on a shelf. Comparing two product lines on return rather than on margin. Setting a weeks-of-cover target for buying. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Where does the Inventory Turnover Calculator stop being reliable?
Average inventory taken as one figure hides seasonality, which for most retailers is where the money is stuck. A simple average of opening and closing stock will read very differently from a monthly average across a year with a peak in it. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the key numbers for the Inventory Turnover Calculator?
General retail is Roughly 4–6 turns a year. Groceries is 12 or more. Furniture and jewellery is 1–2. These are printed on the page itself, so you do not have to take them on trust.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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