Inventory Turnover Calculator

Inventory turnover evaluates the number of times a company sells and replaces its stock of goods during a given period. The process relies on three core equations. First, average inventory is determined by adding the beginning inventory and ending inventory, then dividing by 2: Avg_inventory = (Begin_inventory + End_inventory) / 2. Next, the turnover ratio is calculated by dividing the cost of goods sold (COGS) by the average inventory: Inventory_turnover = COGS / Avg_inventory. Finally, to find how many days it takes to sell your entire inventory, divide the total days in the year by your turnover ratio: Inventory_Days = Year_days / Inventory_turnover.

Imagine a retail business that starts the year with $50,000 in inventory (Begin inventory) and ends the year with $70,000 in inventory (End inventory). Over the course of the 365-day year, their total cost of goods sold (COGS) amounts to $360,000. First, we find the average inventory: ($50,000 + $70,000) / 2 = $60,000. Next, we calculate the inventory turnover ratio by dividing COGS by the average inventory: $360,000 / $60,000 = 6. This means the company completely sold and replaced its stock 6 times during the year. Finally, to find the inventory days, we divide 365 by the turnover ratio: 365 / 6 = approximately 60.8 days to turn stock into sales.

To maximize the utility of your inventory metrics, always use the cost of goods sold rather than retail sales revenue in your numerator to avoid inflating your turnover ratio. Furthermore, monitor your seasonal trends closely; if your business experiences heavy spikes in demand, calculate turnover quarterly rather than annually to catch sluggish items before they become obsolete.