Inventory turnover and days
Calculate inventory turns and average inventory days using period cost of goods sold and opening and closing stock at cost. Turns refer to the entered period, not automatically a year. Use the same currency, cost basis and period throughout.
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How it works
Formula
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Sources
- BDC — inventory turnover ratioSources reviewed: 2026-10-30
Assumptions and limitations
Use the same currency, cost basis and period throughout. The average of two stock snapshots can miss seasonal swings. Zero cost of sales gives zero turns and undefined inventory days; no industry benchmark is assumed.
How to use this tool
Set up the inputs
Enter cost of goods sold, not revenue. Enter opening and closing inventory at cost and the number of days covered by those figures.
Worked examples
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Estimate days of stock from annual costs
(18,000 + 22,000) / 2 = 20,000; 120,000 / 20,000 = 6; 365 / 6 ≈ 60.8333 d.
Frequently asked questions
How should I read the result from Inventory turnover and days?
Turns refer to the entered period, not automatically a year. Inventory days is a ratio-based average, not the age of individual items.
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The calculation or transformation runs in your browser. The tool does not send its input values or generated output to an application server. Loading a page still makes infrastructure requests; optional analytics and Google consent messages have separate controls.
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Help and feedback
Consult the linked sources for definitions and reference data. Contact Support if you have a question or notice a problem.
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