Accounting How to Calculate Days Inventory on Hand

What is Days Inventory on Hand?

Days Inventory on Hand (DIOH) is a financial metric that measures the average number of days it takes for a company to sell its inventory. It provides insight into how efficiently a company manages its inventory and how long it takes to convert inventory into cash.

DIOH is calculated by dividing the cost of goods sold (COGS) by the average inventory value, then dividing by the number of days in the period. A lower DIOH indicates more efficient inventory management, while a higher DIOH may signal overstocking or inefficiencies in the supply chain.

How to Calculate Days Inventory on Hand

Calculating Days Inventory on Hand involves several steps. You'll need to gather data on your inventory levels, cost of goods sold, and the period over which you're analyzing the inventory.

Steps to Calculate DIOH

1. Determine the cost of goods sold (COGS) for the period.
2. Calculate the average inventory value during the period.
3. Divide the COGS by the average inventory value.
4. Divide the result by the number of days in the period to get DIOH.

For more accurate results, use monthly or quarterly data rather than daily figures, as daily fluctuations can skew the results.

Formula

The formula for Days Inventory on Hand is:

Where:

• Cost of Goods Sold (COGS) - The direct costs attributable to the production of the goods sold by a company.
• Average Inventory - The average value of inventory held during the period.
• Number of Days in Period - The number of days in the accounting period (e.g., 30 for a month).

This formula helps standardize the comparison of inventory turnover across different periods and companies.

Example Calculation

Let's walk through an example to illustrate how to calculate Days Inventory on Hand.

Example Scenario

Suppose a company has the following data for a 30-day period:

• Cost of Goods Sold (COGS): $150,000
• Average Inventory: $75,000
• Number of Days in Period: 30

Calculation Steps

1. Divide COGS by average inventory: $150,000 / $75,000 = 2
2. Multiply by the number of days: 2 × 30 = 60

The Days Inventory on Hand for this period is 60 days.

Interpretation

Interpreting Days Inventory on Hand involves understanding what the number means in the context of your business. Here are some guidelines:

• Low DIOH (e.g., 30-60 days) - Indicates efficient inventory management and good cash flow.
• Moderate DIOH (e.g., 60-90 days) - May suggest some inefficiencies but is generally acceptable.
• High DIOH (e.g., 90+ days) - Could indicate overstocking or poor inventory management.

Comparing DIOH with industry benchmarks can provide additional context. For example, retail businesses typically have lower DIOH than manufacturing companies due to faster inventory turnover.