What is inventory turnover?

Inventory turnover measures how many times a business sells through its inventory in a given period (usually a year). Formula: COGS / Average Inventory. Higher turnover = faster sales and better inventory efficiency.

What is Days Inventory Outstanding (DIO)?

DIO = 365 / Inventory Turnover. It shows how many days, on average, inventory sits in stock before being sold. Lower DIO = faster turnover. A DIO of 30 means inventory sells through every month.

What is a good inventory turnover ratio?

Depends on industry. Grocery: 15-20+. Apparel: 4-8. Auto: 6-8. Furniture: 4-6. Luxury goods: 1-2. Generally, 5-10 is healthy for most retail. Above industry average = efficient; below = slow-moving inventory or overstocking.

Is high inventory turnover always good?

Usually, but not always. Very high turnover may indicate stock-outs and lost sales. It can also mean too-low inventory levels causing supply problems. Balance is key — turnover should match customer demand patterns without leaving shelves empty.

How can I improve inventory turnover?

Forecast demand more accurately, reduce slow-moving SKUs, optimize reorder points, implement just-in-time (JIT), discount obsolete stock, improve marketing for slow movers, drop unprofitable products, and tighten supplier lead times.

Why use average inventory instead of ending?

Average inventory smooths out seasonal fluctuations and gives a better picture of typical stock levels. Using only ending inventory may distort results if year-end is unusually high or low (e.g., post-holiday drawdown).

How is inventory turnover used in CCC?

Days Inventory Outstanding (DIO) — derived from inventory turnover — is one of the three components of Cash Conversion Cycle. CCC = DIO + DSO − DPO. Lower DIO improves CCC and reduces working capital needs.

Inventory Turnover Calculator

Inventory turnover measures how many times a business sells through its inventory in a year. Formula: COGS / Average Inventory. High turnover means fast sales (good for cash flow); low turnover may indicate overstocking or slow-moving products. Days Inventory Outstanding (DIO) is the inverse: 365 / turnover, showing how many days inventory sits in stock. Industries vary widely: grocery 15+ turns/year; luxury retail 1-2 turns; auto 6-8.

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calendar_today Updated: April 2026

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inventory_2Inventory Data

COGS (Annual)

Beginning Inventory

Ending Inventory

cycleTurnover Analysis

Turnover Ratio

6.00

turns per year

Average

DIO (days)

60.83

Avg Inventory

$100,000

Interpretation

Moderate turnover — typical for many industries

Input Values

Cost of Goods Sold (Annual)

Beginning Inventory

Ending Inventory

tips_and_updates Tips

• Compare turnover within industry — varies from 1 (luxury) to 50+ (grocery)
• Higher turnover = better cash conversion, less obsolescence risk
• Too high turnover may cause stock-outs and lost sales
• DIO under 30 days = excellent (fast-moving)
• DIO over 120 days = warning (potential obsolescence)
• Track trend over quarters to spot inventory build-up early
• Pair with CCC for full working capital analysis

functions Formula

{Inventory Turnover = COGS / Average Inventory | DIO = 365 / Turnover [{COGS Cost of Goods Sold (annual)} {Average Inventory (Beginning + Ending Inventory) / 2} {DIO Days Inventory Outstanding — average days inventory sits}] High turnover = fast sales, less storage cost, fresher inventory, but may indicate stock-outs. Low turnover = slow sales, possible obsolescence, excess capital tied up. Compare to industry peers for context.}

science Example: COGS $600k, beginning inventory $90k, ending $110k

Average inventory = ($90k + $110k) / 2 = $100k. Turnover = $600k / $100k = 6.0 turns per year. DIO = 365 / 6 = 60.83 days. The company sells through its inventory 6 times per year, with each item sitting in stock about 61 days on average. This is typical for many industries.

Expected Results

Inventory Turnover 6

Days Inventory Outstanding (DIO) 60.8

Average Inventory $100,000

Interpretation Moderate turnover

Efficiency Average

How to Use This Calculator

Enter annual COGS

From income statement.

Enter beginning + ending inventory

From balance sheet.

Review turnover + DIO

Times per year + days in stock.

The Formula

High turnover = fast sales, less storage cost, fresher inventory, but may indicate stock-outs. Low turnover = slow sales, possible obsolescence, excess capital tied up. Compare to industry peers for context.

Inventory Turnover = COGS / Average Inventory | DIO = 365 / Turnover

lightbulb Variables Explained

COGS Cost of Goods Sold (annual)
Average Inventory (Beginning + Ending Inventory) / 2
DIO Days Inventory Outstanding — average days inventory sits

tips_and_updates Pro Tips

Compare turnover within industry — varies from 1 (luxury) to 50+ (grocery)

Higher turnover = better cash conversion, less obsolescence risk

Too high turnover may cause stock-outs and lost sales

DIO under 30 days = excellent (fast-moving)

DIO over 120 days = warning (potential obsolescence)

Track trend over quarters to spot inventory build-up early

Pair with CCC for full working capital analysis

Frequently Asked Questions

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