Inventory Turnover Ratio: Measure How Efficiently a Factory Uses Its Inventory

What is Inventory Turnover Ratio?

Inventory Turnover Ratio measures how many times a company sells or uses its inventory during a specific period.

It helps manufacturers understand whether materials and finished goods are moving efficiently or remaining in stock for too long.

Formula

Inventory Turnover Ratio = Cost of Goods Sold (COGS) ÷ Average Inventory

Where:

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• COGS = Total cost of goods sold during the period.
• Average Inventory = (Opening Inventory + Closing Inventory) ÷ 2.

Simple Example

A manufacturing company has:

• Annual Cost of Goods Sold = ₹60,00,000
• Opening Inventory = ₹8,00,000
• Closing Inventory = ₹12,00,000

Average Inventory:

= (₹8,00,000 + ₹12,00,000) ÷ 2

= ₹10,00,000

Inventory Turnover Ratio:

= ₹60,00,000 ÷ ₹10,00,000

= 6 times per year

This means the company turns over its average inventory approximately 6 times annually.

Inventory Days Calculation

Inventory Days = 365 ÷ Inventory Turnover Ratio

= 365 ÷ 6

= Approximately 61 days

This means inventory remains in the system for an average of approximately 61 days.

Why does it matter?

• Identifies slow-moving inventory.
• Helps reduce excess stock.
• Improves working capital management.
• Supports better purchasing decisions.
• Highlights opportunities to improve material flow.

Important Insight

A higher inventory turnover ratio is not always better.

If inventory is too low, production may stop because of material shortages.

The goal is to maintain the right inventory level to support uninterrupted production without unnecessary stock accumulation.

Practical Insight

Don’t focus only on how much inventory your factory holds.

Also measure how quickly that inventory moves through purchasing, production, and sales.