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Inventory Turnover Calculator
Measure how efficiently a company converts inventory into sales. Enter any US-listed ticker to pull COGS and inventory from live filings — or input values manually — then benchmark the turnover ratio and days inventory outstanding against your sector.
Enter a ticker to calculate inventory turnover
Try WMT, COST, or any product-based US-listed company. The calculator pulls COGS and two periods of inventory from live filings, computes turnover and days inventory outstanding, and benchmarks it against your sector.
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What Is Inventory Turnover?
Inventory turnover tells you how many times a company sells through and replaces its entire stock of goods in a year. It is one of the clearest windows into operational discipline: a retailer that turns inventory 12 times a year is converting shelf stock into cash far faster — and tying up far less working capital — than one turning it 4 times. The formula is deliberately simple:
| Term | What it means |
|---|---|
| COGS | Cost of Goods Sold — the direct cost of the inventory actually sold |
| Average Inventory | (Beginning Inventory + Ending Inventory) ÷ 2 |
| = Inventory Turnover | COGS ÷ Average Inventory — how many times inventory cycles per year |
| Days Inventory Outstanding | 365 ÷ Turnover — the average days a unit sits before selling |
Turnover only becomes meaningful in context. A 4× ratio is a red flag for a grocery chain but perfectly healthy for an aerospace manufacturer with multi-year build cycles. That is why this calculator pairs every result with a sector benchmark and a color-coded verdict — so you can tell at a glance whether inventory management is a competitive strength or a drag on the balance sheet.
How to Use This Calculator
Enter a ticker or go manual
Type any US-listed ticker to auto-populate COGS and two periods of inventory from live filings — or switch to Manual to enter your own numbers.
Pick the sector
Choose the company's industry so the verdict compares its turnover to the right benchmark — a grocer and a defense contractor are judged on very different scales.
Read turnover and DIO
The calculator shows the turnover ratio, days inventory outstanding, and a color-coded verdict: green for above average, yellow for average, red for below average.
Compare to peers
Use the asset turnover screener to see how efficiently the whole balance sheet — not just inventory — generates sales.
Key Concepts
Why average inventory, not ending?
Inventory can swing sharply within a year — think of a retailer stocking up before the holidays. Using the average of beginning and ending balances smooths out that seasonality and gives a fairer denominator than a single balance-sheet snapshot.
Turnover vs. days inventory (DIO)
They are two views of the same fact. A turnover of 10× means inventory cycles ten times a year, which is the same as holding it about 37 days on average. DIO (365 ÷ turnover) is often easier to reason about because it maps directly to calendar time.
When high turnover misleads
Very high turnover can signal lean, efficient operations — or chronic understocking that costs sales through empty shelves. Read turnover alongside revenue growth and gross margin before calling it a strength.
The working-capital link
Every dollar sitting in inventory is a dollar not available for reinvestment or distribution. Slow turnover is a hidden drag on free cash flow — the input that ultimately drives valuation in a discounted cash flow model.
Frequently Asked Questions
What is inventory turnover?
Inventory turnover measures how many times a company sells through and replaces its inventory in a year. It equals COGS divided by average inventory. Higher turnover means stock moves quickly and less cash is tied up in inventory.
How do you calculate inventory turnover?
Inventory Turnover = COGS ÷ Average Inventory, where Average Inventory = (Beginning + Ending Inventory) ÷ 2. A firm with $500,000 COGS and $100,000 average inventory turns over 5.0× a year.
What is a good inventory turnover ratio?
It depends on the sector. Grocery runs 12–20×, general retail 8–12×, manufacturing 4–8×, and aerospace 2–5×. Compare a company to its sector benchmark rather than a single universal threshold.
What is Days Inventory Outstanding (DIO)?
DIO = 365 ÷ Inventory Turnover. It converts the ratio into the average number of days a company holds inventory before selling it. A 5.0× turnover equals roughly 73 days of inventory on hand.
FINISHED THE NUMBERS?
A calculator gives you one number. The report gives you the argument.
Inventory turnover in context — working capital efficiency, margin trends, and whether the operating model actually converts sales into cash — on any public company.
See a sample report →