Inventory Turnover Calculator
Stock sitting on a shelf is cash sitting on a shelf too. This tool shows how many times you sell and replace your stock in a year, and how many days it sits before it sells.
How your stock cycle breaks down
What this means
Fill in the fields above and calculate to see a plain language reading of your result.
To improve this
Your next step will appear here once you calculate your result.
What inventory turnover actually tells you
Inventory turnover counts how many times you sell and replace your entire stock in one period. A grocery store restocks fast. A furniture shop restocks slowly. Neither is wrong, but each should be judged against its own kind of business.
Picture a small bakery. If it buys flour and sells it as bread within three days, its stock barely sits still. Now picture a furniture shop. A sofa might sit on the floor for two months before someone buys it. Both businesses can be healthy. They just move stock at very different speeds.
The ratio on its own only tells half the story. Inventory days, the second number this calculator gives you, turns that ratio into something you can picture. It tells you how many days, on average, a dollar of stock sits before it turns into a sale.
Breaking down the formula
Three simple steps turn your raw numbers into the two results above. No complex math, just addition, division, and one more division.
Cost of goods sold is used instead of sales revenue because inventory is recorded at cost, not at the price you sell it for. Comparing cost to cost keeps the ratio honest.
Meet a small shoe store. It started the year holding $40,000 worth of shoes and ended the year holding $50,000 worth. Across the year it spent $270,000 buying stock that it went on to sell, its cost of goods sold.
Average inventory: ($40,000 + $50,000) ÷ 2 = $45,000.
Inventory turnover: $270,000 ÷ $45,000 = 6.0 times a year.
Inventory days: 365 ÷ 6.0 = about 61 days. A pair of shoes sits in this store for roughly two months before it sells.
That sits inside the typical retail range, so this store is neither struggling to sell nor dangerously understocked. It has room to speed things up before the next shoe season starts.
Why the same stock problem shows up in every business
Money spent on stock is money you cannot spend on rent, wages, or growth until that stock sells. Slow turnover quietly drains cash even while the business looks busy on paper.
A high inventory days number often points to overbuying, weak sales, or stock that has fallen out of demand. A very low number can also be a warning. It can mean you keep running out of popular items and losing sales you should have made.
- Rising inventory days over several periods usually signals a slowdown building up.
- Falling inventory days usually means sales are picking up or buying has gotten sharper.
- Always compare your ratio against businesses in your own industry, never against a different one.
Frequently asked questions
Want the fuller cash picture?
Inventory is only one piece of how fast your cash moves through the business. See the whole cycle with the Working Capital Calculator next.