Days Sales in Inventory Calculator

Use this calculator to estimate days sales in inventory.

What this calculator does

The days sales in inventory calculator helps estimate how long inventory stays on hand before being sold.

It is useful for:

• inventory analysis
• operations planning
• cash flow review
• stock efficiency tracking

Formula

Days Sales in Inventory = Average Inventory ÷ Cost of Goods Sold × 365

Where:

• Average Inventory = average inventory value over a period
• Cost of Goods Sold = total cost of goods sold in the same period
• Days Sales in Inventory = average number of days inventory remains unsold

Example calculation

If:

• Average inventory = 50000
• Cost of goods sold = 250000

Then:

• Days sales in inventory = 50000 ÷ 250000 × 365
• Days sales in inventory = 73

What is days sales in inventory?

Days sales in inventory shows how many days, on average, inventory stays in stock before being sold.

Why days sales in inventory matters

This calculation helps businesses:

• assess stock efficiency
• improve inventory turnover
• identify slow-moving stock
• manage working capital

When to use this calculator

Use this calculator when you want to:

• review inventory performance
• benchmark inventory efficiency
• improve cash flow
• reduce excess stock

Common mistakes

Common mistakes include:

• using mismatched periods
• confusing sales with cost of goods sold
• ignoring seasonal shifts
• comparing unlike product categories

Days sales in inventory vs inventory turnover

These are closely related.

• Days sales in inventory shows time in days
• Inventory turnover shows how often inventory is sold and replaced

Related calculations

You may also want to use:

• Inventory Turnover Calculator
• Reorder Point Calculator
• Inventory Carrying Cost Calculator

FAQs

What does this calculator do?

It helps you calculate days sales in inventory.

Why is this important?

It helps show how efficiently inventory is moving through the business.

Is a lower DSI better?

Often yes, but the right level depends on your category, margins, and supply chain.