How do you calculate inventory turnover and why is it useful?

How do you calculate inventory turnover and why is it useful?

• A. COGS divided by ending inventory; measures stock valuation accuracy.
• B. Ending inventory divided by COGS; measures time to sell stock.
• C. COGS divided by average inventory; measures efficiency of inventory usage.
• D. Average inventory divided by revenue; measures gross margin.

Answer: (C)

Inventory turnover shows how efficiently a business uses its stock to generate sales by indicating how many times you sold and replaced the inventory during a period. The best way to calculate it is cost of goods sold divided by average inventory. Using COGS matters because it reflects the actual cost of the goods that left the stock and were sold, aligning with the period’s sales activity and expense recognition. Using average inventory in the denominator smooths out fluctuations in inventory levels over the period, giving a truer picture than ending inventory alone, which can be distorted by timing. This measure is useful for judging operational efficiency, planning purchases and production, and managing working capital. It also lets you compare performance across periods or against industry benchmarks. For example, if COGS is $500,000 and average inventory is $100,000, turnover is 5, meaning the inventory turned over five times during the period; the approximate days in inventory would be about 365 divided by 5, roughly 73 days. Using ending inventory divided by COGS would give a ratio that’s not the turnover itself, and using average inventory divided by revenue would mix inventory with revenue in a way that doesn’t reflect how quickly inventory is sold.

Inventory turnover shows how efficiently a business uses its stock to generate sales by indicating how many times you sold and replaced the inventory during a period. The best way to calculate it is cost of goods sold divided by average inventory. Using COGS matters because it reflects the actual cost of the goods that left the stock and were sold, aligning with the period’s sales activity and expense recognition. Using average inventory in the denominator smooths out fluctuations in inventory levels over the period, giving a truer picture than ending inventory alone, which can be distorted by timing.

This measure is useful for judging operational efficiency, planning purchases and production, and managing working capital. It also lets you compare performance across periods or against industry benchmarks. For example, if COGS is $500,000 and average inventory is $100,000, turnover is 5, meaning the inventory turned over five times during the period; the approximate days in inventory would be about 365 divided by 5, roughly 73 days.

Using ending inventory divided by COGS would give a ratio that’s not the turnover itself, and using average inventory divided by revenue would mix inventory with revenue in a way that doesn’t reflect how quickly inventory is sold.