Inventory Turnover CalculatorFree online financial calculator — instant results, no sign-up
Calculate inventory turnover and days inventory outstanding using a 365-day year.
Estimates only, based on the inputs and assumptions shown. This is not financial, investment, tax, or legal advice. Prices, rates and local rules may change; crypto scenarios do not predict returns. Confirm important decisions with a qualified professional.
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About the Inventory Turnover Calculator
The Inventory Turnover Calculator measures how many times a business sells and replaces its average inventory during a year using annual cost of goods sold and average inventory value. It also calculates days inventory outstanding using a fixed 365-day year. Together, these outputs help assess how quickly inventory moves and how long funds remain tied up in stock.
- Annual cost of goods sold ($)
- The total cost in dollars of inventory sold during the year, rather than its sales revenue; the default is $360000.
- Average inventory ($)
- The average inventory value in dollars over the same year, measured on a cost basis consistent with cost of goods sold; the default is $60000.
Formula and method
T = C / I; D = 365 / T = (365 × I) / C. With the default inputs: T = 360000 / 60000 = 6; D = 365 / 6 = 60.8333 days, rounded to four decimal places.
- CAnnual cost of goods sold, in dollars.
- IAverage inventory for the same year, in dollars.
- TInventory turnover, expressed as times per year.
- DDays inventory outstanding, expressed in days using a 365-day year.
Divide annual cost of goods sold by average inventory to calculate inventory turnover. Then divide 365 by the unrounded turnover result to calculate days inventory outstanding. With annual cost of goods sold of $360000 and average inventory of $60000, the results are inventory turnover of 6 and days inventory outstanding of 60.8333.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Annual cost of goods sold360000 $
- Average inventory60000 $
Results
- Inventory turnover6
- Days inventory outstanding60.8333
How to use the Inventory Turnover Calculator
- 1Find annual cost of goods sold for the year you want to analyze; use the default $360000 to follow the worked example.
- 2Determine average inventory for that same year on a consistent cost basis; use the default $60000 for the worked example.
- 3Enter both dollar amounts, using positive values for meaningful results for both outputs.
- 4Calculate and read the inventory turnover row: the default inputs produce 6 times per year.
- 5Read the days inventory outstanding row: the default inputs produce 60.8333 days, then compare both outputs with similar businesses or prior years.
Reading your result
The inventory turnover row shows how many times annual cost of goods sold covers average inventory: 6 means the business sells the equivalent of its average inventory six times per year. The days inventory outstanding row expresses that pace as an estimated holding period: 60.8333 means inventory is held for about 60.8 days on average before sale. Higher turnover and lower days generally indicate faster inventory movement, but unusually high turnover can also indicate insufficient stock.
Limitations
The calculator assumes a 365-day year and annual cost of goods sold matched to average inventory for the same period. Results depend on how representative the inventory average is; a beginning-and-ending balance average can miss seasonal peaks. Accounting methods, write-downs, product mix, and industry differences can affect comparisons. Days inventory outstanding is a financial estimate, not a measurement of each item's actual time in stock, and it does not measure customer payment timing or profitability. Zero average inventory makes turnover undefined; zero cost of goods sold with positive inventory gives zero turnover but no finite days inventory outstanding. Negative inputs do not provide meaningful results for this use.
Common questions
Why does this calculator use cost of goods sold instead of sales revenue?+
Inventory is normally valued at cost, so cost of goods sold provides a consistent basis for comparison. Sales revenue includes markup and would generally overstate turnover relative to this cost-based measure.
How should I calculate average inventory for this tool?+
A common approach is to add beginning and ending inventory values for the year and divide by two. If inventory varies substantially during the year, use regularly spaced inventory balances to obtain a more representative average.
Why does inventory turnover of 6 produce 60.8333 days inventory outstanding?+
The calculator divides its fixed 365-day year by turnover: 365 / 6 = 60.8333 days when rounded to four decimal places. It does not switch to a 360-day convention or a 366-day leap year.
Is inventory turnover of 6 a good result?+
There is no universal target. Compare 6 times per year and 60.8333 days with businesses that sell similar products and with your own historical results, while checking stockouts, obsolete stock, and seasonal demand.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
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Results are estimates for informational purposes and are not financial, medical or legal advice.