Inventory Turnover Calculator
Enter your cost of goods sold (COGS) and beginning and ending inventory values to calculate how efficiently a business converts stock into sales.
How many times inventory was sold and replaced in the period
- 1
Average inventory
(80,000 + 120,000) ÷ 2 = 100,000 - 2
Inventory turnover
500,000 ÷ 100,000 = 5How many times the average inventory balance is sold and replaced in the period. - 3
Days inventory outstanding (DIO)
365 ÷ 5 = 73 days
How does this calculator work?
Inventory Turnover = COGS ÷ Average Inventory. It shows how many times stock is sold and replenished in a year. Days Inventory Outstanding (DIO) = 365 ÷ Turnover converts this to the average days an item spends in stock before being sold.
Formula
How this is calculated
The inventory turnover ratio measures how many times a company sells and replaces its entire inventory stock within a period, typically a fiscal year. It is computed by dividing the cost of goods sold (COGS) — the direct cost of producing the goods sold — by the average inventory held over the same period. Average inventory is the simple mean of the opening and closing balances and smooths seasonal peaks. A higher ratio indicates faster-selling goods and more efficient use of capital tied up in stock; a lower ratio can signal slow-moving inventory, overordering or weak sales.
The companion metric, days inventory outstanding (DIO), converts the ratio into a more intuitive time-span: 365 divided by the turnover ratio gives the average number of days inventory sits on the shelf before being sold. A DIO of 60, for instance, means the company holds each unit for about two months on average. Retailers typically aim for turnovers of 4–12×, whereas manufacturers or distributors of bulky goods often run lower.
The right target depends heavily on industry, product perishability and supply-chain lead times. Grocery chains routinely exceed 20× while jewellers or aircraft-parts suppliers may turn inventory fewer than twice per year. Always benchmark the ratio against sector peers and compare across reporting periods for trend analysis.
Frequently asked questions
It depends entirely on the industry. Fast-moving consumer goods (grocery, apparel) often target 8–12× per year, while slow-moving industrial goods may be healthy at 2–4×. Compare your ratio to sector-specific benchmarks and your own historical trend rather than a single universal threshold.
Inventory is recorded at cost, not at selling price, so using COGS keeps the numerator and denominator on the same cost basis. Using revenue would inflate the ratio and make cross-company comparisons misleading.
An unusually high ratio can mean strong sales efficiency, but it can also signal understocking — the company may be running out of inventory and losing sales. Balance turnover targets against stockout risk and customer service levels.
Also known as
TG we-Calculate Editorial Team. (2026). Inventory Turnover Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/inventory-turnover-calculator
TG we-Calculate Editorial Team. "Inventory Turnover Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/inventory-turnover-calculator.
TG we-Calculate Editorial Team, "Inventory Turnover Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/inventory-turnover-calculator
@misc{wecalculate_inventory_turnover_calculator, title = {Inventory Turnover Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/inventory-turnover-calculator}}, year = {2026}, note = {TG we-Calculate} }
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