Inventory Turnover Guide: Formula, Benchmarks & Improving Inventory Efficiency
Inventory turnover measures how many times a company sells and replaces its inventory in a period. High turnover means efficient capital use; low turnover means cash is locked in slow-moving stock. Learn the formula, industry benchmarks, and improvement strategies.
Inventory Turnover Formula and Days Inventory Outstanding
Two versions of the inventory turnover formula are in common use, and the difference matters for benchmarking accuracy. Version 1 — COGS-based (most accurate): Inventory Turnover = Cost of Goods Sold ÷ Average Inventory Average Inventory = (Beginning Inventory + Ending Inventory) ÷ 2 This version is preferred because COGS and inventory are both sta
Industry Benchmarks: What Is a Good Inventory Turnover Ratio?
Inventory turnover norms vary enormously by industry based on product perishability, product complexity, demand volatility, and supply chain structure. Comparing your turnover against the correct industry benchmark — not a generic target — is essential. High-turnover industries (low DIO): Grocery/supermarkets: 20–30× per year (12–18 DIO). Perishabl
The True Cost of Inventory: Carrying Costs Explained
Low inventory turnover is not just an abstract efficiency metric — it has a direct dollar cost through carrying costs. Carrying costs represent all the expenses of holding inventory over time. Carrying cost components: Capital cost: The opportunity cost of cash tied up in inventory. If you hold $1,200,000 in inventory and your cost of capital is 10
Strategies to Improve Inventory Turnover
Improving inventory turnover requires either reducing average inventory held (without increasing stockouts) or increasing COGS throughput (selling more at the same or lower inventory level). Most improvement programs address both. Demand forecasting improvement: Poor demand forecasting is the root cause of most inventory problems — both overstockin
Frequently Asked Questions
What is inventory turnover ratio?
Inventory turnover ratio measures how many times a business sells and replaces its inventory over a given period, usually one year. Formula: Inventory Turnover = Cost of Goods Sold ÷ Average Inventory. A ratio of 6× means the company sold and replaced its inventory six times in t
What is a good inventory turnover ratio?
It depends on your industry. Grocery retail typically achieves 20–30× turnover. Electronics retail: 5–10×. Jewelry: 1–3×. Benchmark against your specific industry — most financial databases publish sector averages. Within your industry, improving your own ratio over time (even mo
How do you calculate days inventory outstanding?
Days Inventory Outstanding (DIO) = 365 ÷ Inventory Turnover. Alternatively: DIO = (Average Inventory ÷ COGS) × 365. For an inventory turnover of 6×: DIO = 365 ÷ 6 = 60.8 days. This means the business holds approximately 61 days of inventory at any given time. Lower DIO (fewer day
Why is high inventory turnover good?
High inventory turnover means you're selling inventory quickly, reducing carrying costs (typically 20%–30% of inventory value annually), freeing up working capital, and minimizing obsolescence/spoilage risk. Faster-moving inventory requires less warehouse space and less capital t
What causes low inventory turnover?
Common causes: overstocking (buying more than market demand), slow-moving or obsolete SKUs, inaccurate demand forecasting, poor supplier lead time management, carrying excess safety stock, or genuine sales slowdown. Each cause requires a different solution — overstocking requires
How does inventory turnover affect cash flow?
Inventory turnover directly affects the Cash Conversion Cycle (CCC). Reducing Days Inventory Outstanding from 90 to 60 days on $5M in annual COGS frees approximately $411,000 in working capital ($5M ÷ 365 × 30 days). This cash can be used for investment, debt reduction, or operat